2.92 POLYZOA INFUNDIBULATA. 



PLATE LI. FIG. 3, 4. 



Hippothoa divaricate, Lamour. Expos. Method. 82, tab. 80, fig. 15, 16. Hippothoa 

 lanceolata, Gray Zool. Misc. 35. Hassall in Ann. and Mag. Nat. Hist. vii. 366, 

 pi. 8, fig. 5, 6. Couch Zooph. Cornw. 43. W. Thompson in Ann. Nat. Hist. v. 

 252. Couch Corn. Faun. iii. 1 02, pi. 1 8, fig. 6. 



Hob. On old shells, especially bivalves, from deep water, not 

 uncommon. 



" Coral attached, slender, dichotomously and divaricately branch- 

 ed, pearly white ; cells slender, linear, ovate, base filiform, generally 

 emitting a cell at right angles from the middle of each side ; mouth 

 small, round, with a raised margin, placed near the top of the cell." 

 J. E. Gray. 



This is much more slender than the preceding species, so that its 

 confervoid polypidom is scarcely visible to the naked eye. The cells 

 are far more distant apart, and are connected by a very delicate cal- 

 careous thread : they vary in shape, for on the same specimen I 

 have seen them ovate- and bulged at the base, fusiform, elliptical and 

 oblong ; and I have also seen a cell fully thrice as large as others 

 near it, and with which it was connected. Hence it seems obvious 

 that the H. lanceolata and divaricata must be united as one species. 

 The aperture, when compared with that of the preceding, is very 

 small, always surrounded by a raised margin, and is sometimes even 

 shortly tubular. 



There is a variety of this species in which the cells are conti- 

 guous. It is found on sea-weeds only, so far as my experience 

 goes. 



3. H. SICA, "encrusting; calcareous; cells spear-shaped; 

 large end placed distally ; apertures small suiter Mimal" 

 R. Q. Couch. 



Hippothoa sica, Couch Corn. Faun. iii. 102, pi. 19, fig. 8. 



Hob. "On stones from deep water, common. Polperro, Goran," 

 R. Q. Couch. 



" This species of Hippothoa differs so decisively from the two 

 described above, that there can be no doubt of its being specifically 

 distinct. The cells are calcareous, enlarged, and rounded at the 

 distal, and pointed at the proximal end. Their direction is linear ; 

 they are attached to each other at their extremities, and their 

 length is about four times their transverse diameter. This species 

 is more sparingly branched than the others. The branches arise at 



