1. Twenty-five species of hydroids were identified in samples taken during the Biotic Census of Cape Cod Bay. Of these, only Corymorpha pendula, Acaulis primarius, Hydractinia echinata, Gonothyraea loveni, Sertularia cupressina, and S. latiuscula were particularly common. Eleven of the 25 species were found only once or twice. Bottom type throughout much of the bay is sand or silty-sand, and the general paucity of firm substrates is evidently a primary factor limiting hydroid abundance and diversity in the area.2. Eleven species are recorded from Cape Cod Bay for the first time. Present records extend the known distribution of Euphysa farcta and Acaulis primarius southward, and that of Stylactis arge and Lovenella gracilis northward. As expected, the hydroid fauna of Cape Cod Bay is characteristically boreal in its zoo-geographic affinity, and many of the species represented are amphi-Atlantic.3. Halecium gracile Verrill, 1874 is placed in synonymy with H. halecinum (Linnaeus, 1758), Tubularia cristata Mc...

A history of the British hydroid zoophytes

Biotic census of cape cod bay: hydroids

Although the genus Halecium is easy to recognize, identifications at the species level are often difficult, this even for quite common and supposedly well-known species of the north-eastern Atlantic. This paper revises and re-describes some Halecium species which resemble each other closely and which are not easy to distinguish. Additional information on a few rare species is also provided. The study is based on material collected from the North Atlantic, Mediterranean, South Africa, and New Zealand. Halecium scutum Clark, 1877 is recognized as a valid species and distinct from both H. beanii and H. halecinum; colony form and microscopic characters allow a distinction. The pinnate colony form of H. halecinum is a characteristic trait, but not all colonies show this growth form. Halecium beanii can occur in monosiphonic and polysiphonic colonies. Monosiphonic colonies of H. beanii have probably been misidentified by some authors as H. lankesterii. The differences of H. lankesteri to H. beanii and H. petrosum are discussed. The South African population of the reportedly cosmopolitan H. beanii has distinct gonothecae and could belong to a separate species. The Mediterranean Halecium mediterraneum is hardly distinguishable from the New Zealandic H. delicatulum, but it is kept separate mainly for biogeographic reasons. The rare Mediterranean Halecium banyulense is redescribed based on a second find from Naples. The male gonothecae of Halecium corrugatissimum are described for the first time.

Taxonomic revision and systematic notes on some Halecium species (Cnidaria, Hydrozoa)

(1930). LIV.—On the association of a gymnoblastic Hydroid (Zanclea protecta, sp. n.) with various Cheilostomatous Polyzoa from the Tropical E. Pacific. Annals and Magazine of Natural History: Vol. 5, No. 29, pp. 552-560.

LIV.—On the association of a gymnoblastic Hydroid (Zanclea protecta, sp. n.) with various Cheilostomatous Polyzoa from the Tropical E. Pacific

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Les hydroides Ordoviciens a squelette chitineux

The species of the genus Filellum Hincks have been reviewed and a species new to science, Filellum disaggregatum sp. nov., is described and figured, the coppinia of this species being much different from those of the other members of the genus. The coppinia of Filellum serratum Clarke, hitherto unknown from the Mediterranean Sea, is also described and figured. A key for the identification of the species of the genus is also presented.

A history of the British hydroid zoophytes

Citations

Biotic census of cape cod bay: hydroids

Taxonomic revision and systematic notes on some Halecium species (Cnidaria, Hydrozoa)

LIV.—On the association of a gymnoblastic Hydroid (Zanclea protecta, sp. n.) with various Cheilostomatous Polyzoa from the Tropical E. Pacific

Les hydroides Ordoviciens a squelette chitineux

On the species of filellum hincks, 1868 (cnidaria : hydrozoa) with the description of a new species

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