122 
Z. HYDROIDA. 
Sertularia. 
two opposite voids, sessile , distinct and separated by a joint from 
the stem , short with everted apertures : vesicles scattered.— Po- 
lypes hydraform. 
* Cells distinctly alternate. 
1. S. P olyzoniaSj erect , subfiexuous ; cells ovate , with a 
wide somewhat uneven aperture ; vesicles obovate , wrinkled across * 
the orifice contracted and plain. Mr Newton. 
Plate VIII. Fig. 1, 2, 3. 
Corallina minus ramosa, alterna vice denticulata, Raii, Syn. 35, no. 13, 
tab. 2, fig. 4, male Great Tooth Coralline, Ellis, Coral. 5, no. 3, 
pi. 2, fig. a, A. and pi. 38, fig. 1, A. Sertularia polyzonias, Lin. 
Syst. 1312. Ellis and Soland. Zooph. 37- Berk. Syn. i. 219. Turt. 
Gmel. iv. 683. Blumenb . Man. 273. Turt. Brit. Faun. 216. Wern. 
Mem. i. 564. Stew. Elem. ii. 447. Lam. Anim. s. Vert. ii. 117. 2de 
edit, ii 142. Lamour. Cor. Flex. 190. Corallina, 83. Risso, L’Europ. 
merid. v. 130. Rose, Vers, iii. 119. Hogg's Stockton, 31. Flem. 
Brit. Anim. 542. Johnston in Trans. Newc. Soc. ii. 256. Templeton 
in Mag. Nat. Hist. ix. 468 S. ericoides, Pall. Elench. 127 Ser- 
tolara polizonia, Cavol. Polip. Mar. 224, tav. 8, fig. 12-14. La Ser- 
tulaire zonee, Blainv. Actinolog. 480. 
Hah. On shells and other corallines, in deep water. Near Queen- 
borough in the island of Sheppey, Ellis. Leith shore, Jameson. 
Coast of Ayrshire, Mr P. W. Maclagan. On the shore of Belfast 
Lough, Templeton. Cork Harbour, J. V. Thompson. Scarborough, 
Mr Bean. Coasts of N. Durham and Berwickshire. — (/3.) Corn- 
wall, Pallas. Isle of Wight, Ellis. Berwickshire. 
Polypidoms affixed by a creeping tubular fibre, from 1 to 2 inches 
high, of a yellowish horn-colour, filiform and slender, scarcely zig- 
zag, simple or sparingly branched in general, but specimens occasion- 
ally occur which are bifariously pinnated ; the pinnae alternate, erec- 
to-patent. Cells rather distant with an oblique joint in the stem 
above the origin of each of them, urceolate, smooth, the aperture wide 
and obsoletely tridentate. Polypes white or sometimes bright-yel- 
low, with numerous tentacula. Vesicles large, sessile, ovate with a 
short tubulous apex, smooth or transversely wrinkled on the upper 
half. 
Pallas describes a variety (/3) worthy of notice, not unfrequent 
on the coast of Cornwall, 3 inches and upwards in height, with 
a compound stem, and branched in a pinnate manner similar to Thoa 
lialecina, which this variety indeed very closely resembles. Ellis 
mentions that he had received specimens of the same from the Isle of 
Wight ; and I have found it on the coast of Berwickshire. In the col- 
lection of my friend Dr Coldstream there are specimens also, from 
