298 Rev. T. Hincks on new British Hydroida. 
much branched; main stems very slightly flexuous, of a deep 
horn-colour below, becoming white and very delicate towards 
the upper extremity, strongly annulated at the base and above 
each division, giving off branches at each bend; branches erect, 
flexuous, very tender and hyaline, sometimes of great length 
and much ramified, ringed above every calycle and ramule. 
Hydrothece alternate, much elongated, slender, of very thin 
texture, with nearly parallel sides for two-thirds of the length, 
and then tapering off to the base, borne on ringed pedicels, the 
rim cut into numerous shallow denticles of castellated form, 
slightly indented at the top. Gonothece axillary, irregularly 
ovate, flattened at the top, and supported on a ringed stalk. 
Height about 2 inches. 
I place this fine species provisionally in the genus Gonothyrea. 
From the structure of the capsule I infer that this is its true 
position ; but I have not traced the history of its reproduction. 
Hab. Profusely investing Tubularia, Halecium, &c., from 
Shetland. I am indebted to J. Gwyn Jeffreys, Esq., for my 
specimens. 
CUSPIDELLA, nov. gen. 
Hydrothecz cylindrical or subcylindrical, sessile on a delicate 
creeping stolon, with a conical operculum, composed of many 
pieces. Polypites cylindrical, with a single verticil of filiform 
tentacles. Reproduction unknown. 
C. humilis, n. sp. 
- Hydrothece very minute, subcylindrical, the upper portion 
divided into ten or twelve convergent segments, which form an 
operculum. Gonothece unknown. 
The calycles of this curious species are little cylinders, termi- 
nating in a point above, and rising directly and without any 
trace of a pedicle from the creeping stolon. 
Hab. On the stems of zoophytes: North Wales, Yorkshire, 
Northumberland, Shetland, Connemara. , 
Suborder SERTULARIDA. 
Family Sertularide. 
Genus SERTULARIA, 
S. attenuata, n. sp. 
Syn. Sertularia rosacea, Ellis, Corall. 9, pl. 4. fig. C; Johnston, Brit. 
Zooph. 470. (Specimen from Orkney, Lieut. Thomas.) 
Sertularia pinaster, var., Johnston, Brit. Zooph. 72, figs. ¢, d. 
Aydrocaulus straight, somewhat rigid, pinnately branched, often 
running out above into long tendril-like filaments, thickened 
