74 ANTHOZOA HYDROIDA. 



Hob. " On oyster-beds, common," Fleming. Frith of Forth, 

 plentifully, Dr. Coldstream. Coast of Northumberland, near Dun- 

 stanborough, R. Embleton. Whitburn, Miss M. Dale. Scarbo- 

 rough, W. Sean. Coast of Aberdeen, J. Macgillivray. 



Polypidom attached by tortuous tubular fibres, from two to four 

 inches in height, pinnated with alternated branches, the rachis 

 usually of a blackish or dusky horn colour, with a slight gloss on 

 the surface, rather rigid when dry, straight, flattish, jointed, with a 

 pair of opposite cells on each interspace, pinnae spreading, mostly 

 simple, jointed like the stem : Cells tubular, the upper portion free, 

 erecto-patent, with a wide aperture, often sinuated on the proximal 

 margin, and girded with two or three faint circular wrinkles : 

 Ovarian vesicles large, pear-shaped, of a thin membranous texture, 

 with the top cut into four deep convergent lanceolate segments. The 

 immature vesicles are truncate above and entire, as if the segments 

 were folded inwards. 



12. S. TAMARISCA, cells offottt*, tubular, the upper half di- 

 v^rgent with a, wid0 aperture sinuated on the margin ; vesicles 

 val, truncate, with two small points at the corners and a tubu- 

 lous mouth. Ellis. 



PLATE XIII. FIG.' 2, 3, 4. 



Sea Tamarisk, Ellis Corall. 4, no. 1, pi. 1, fig. a, A. Sertularia tamarisca, Lin. Syst. 

 1307. Pall. Blench. 129. Ellis and Soland, Zooph. 36. Olw. Zool. Adriat. 288. 

 Don's PI. and Anim. of Forfar, 36. Lamour. Cor. Flex. 188. Lam. Anim. s. 

 Vert. 2de edit. ii. 153. Hassall in Ann. Nat. Hist. vi. 168. Couch Zooph. Corn. 

 8 : Corn. Faun. iii. 21. Dynamena tamarisca, Flem. Brit. Anim. 543. 



Hob. On old shells in deep water, not common. Near the 

 island of Dalkey, at the entrance of the harbour of Dublin, Ellis. 

 Belfast lough, /. Templeton. Ballycastle, co. Antrim, Dr. J. L. Drum- 

 mond. Howth, co. Dublin, R. Ball. Portmarnock, on the same 

 coast, W. Thompson. Near Aberdeen, Dr. David Skene. Angus- 

 shire, Mr. Don. Frith of Forth, Dr. Coldstream. Very rare at 

 Scarborough, Mr. Bean. Bootle coast, rare, Mr. Tudor. Cornwall, 

 rare, R. Q. Couch. "Very rare, but very fine indeed, in Fowey 

 harbour ; Paignton, Devon ; and Norfolk," C. W. Peach. 



Polypidom from four inches to "sometimes nearly a foot," in 

 height, rooted by a creeping vermicular fibre, stout and erect, den- 

 ticulated throughout, bifariously branched, the branches commonly 



