Sertularia. 
Z. HYDROIDA. 
135 
numerous segments. In Plate XI. Fig. 3, I have given a figure of 
such a specimen selected from many others on account of its greater 
divergence from the usual character of the species. When, on the 
contrary, the polypidom attains a foot or more in height, the lower 
half of the stem loses its branches and cells, and becomes entirely 
naked. I think it likely that such a specimen, of the unusual size of 
3 feet, constitutes the Sertularia uber of Sir J. G. Daly ell in Edin. 
New Phil. Journ. xvii. 412. 
16. S. cu press in A, polypidom cauliferous ; cells nearly op- 
posite, tubulous , adnate , the aper'ture scarcely contracted , bilabiate ? 
with two minute spinous teeth ; vesicles nearly oval . — 'Ellis. 
Plate XIII. 
Sea- Cypress, Ellis, Corall. 7, No 5, pi. 3, fig. a, A. Sertularia cupres- 
sina, Lin. Syst. 1308. Ellis and Soland. Zooph. 38. Berk. Syn. i. 
216. Turt. Gmel. iv. 677. Wern. Mem. i. 564. Turt. Brit. Faun. 
213. Stew. Elem. ii. 442 Bose, Vers, iii. 108. Lam. Anim. s. Vert, 
ii. 118. Lamour. Cor. Flex. 192. Corall. 84. Hogg's Stock. 32. Tem- 
pleton in loc. cit. 468. Stark , Elem. ii. 440, pi. 8, fig. 12. Bisso , 
L’Europ. merid. v. 311 La S. cypres, Blainv. Actinol. 480 Dy- 
namena cupressina, Elem. Brit. Anim. 543. 
Hah 44 The Sea-cypress is chiefly found in deep water on the coast 
■of Yorkshire, Scotland, and the north of Ireland,” Ellis. Scarbo- 
rough, Mr Dean. Frith of Forth, Jameson. Cork Bay, Mr J. V. 
Thompson. On the shore of Magilligan Strand, County Derry, 
Templeton. 
This is in general a larger and stouter species than the preceding, 
with longer branches more decidedly fan-shaped, the pinnae being 
closer and more parallel to one another. The cells are in two rows, 
nearly opposite, smooth and pellucid, adnate, with the margin of the 
comparatively wide aperture sinuated so as to form two or some- 
times three prominent denticles. The branches in some specimens 
are gracefully arched, bending as it were under the load of pregnant 
ovaries which they carry, and which are arranged in close-set rows 
along the upper side of the pinnae. They are of an oval shape, 
smooth, attenuated at the base, with sometimes a sharp spine at each 
corner of the apex, but these are oftener absent. 
This and the preceding have a distinct stem, in which they differ 
from all the other native species, which are pre-eminently frondose 
or homologous, the offsets and pinnae being in all respects the same 
as the primary shoot. Pallas maintains that they constitute but one 
species, his S. cupressina, Elench. 141 the characters assigned to 
them respectively being far from specifical, since he found, on one 
