HlPrOTHOA, 
Z. ASCIDIOIDA. 
265 
Milne-Edwards refers this species to Sertularia , section Dyname - 
na, bnt there is something- in the habit to render this reference very 
doubtful, unless it is founded on an examination of the polype, which 
it is not mentioned to be. Lam. Anim. s. Vert. 2de edit. ii. 180. 
28. Hippothoa,* Lamouroux. 
Character. Polypidom confervoid , adherent and creeping , 
calcareous , irregularly branched , the branches frequently anasto- 
mosing, formed of elliptical cells linked to each other at the ex- 
tremities ; aperture lateral , near the distal end. — Polypes asci- 
dian. 
1. H. catenulariAj 66 cells rounded anteally , tapering to the 
other extremity, aperture oval.” Jameson. 
Plate xxx. Fig-. 9, 10. 
Tubipora catenularia? Jameson , in Wern. Mem. i. 561. T. catenulata? 
Stew. Elem. ii. 425 Hippothoa catenularia, Flem. Br. Anim. 534. 
H. Elliotse, Gray, Zool. Misc. 34. 
Hab. On shells in deep water, not uncommon, Dr Fleming. Ork- 
ney and Shetland Islands, Jameson. Attached to Pinna ingens in 
the harbour of Kinglade near Cork, Miss Elliot. 
Polypidom closely adherent, much and irregularly branched in a 
confervoid manner, white, smooth, glossy, calcareous, the branches 
spreading, frequently anastomosing, sometimes parallel and coales- 
cing, formed of a series of cells connected like a string of bugles ; 
cells oval, widest and rounded anteally, the aperture oval with a plain 
thickish rim, placed near the top.— In its mode of ramification this 
coralline resembles many of the plant-like figures in marble or agate. 
“ The branches proceed nearly at right angles, issuing from the mar- 
gin beside the mouth,” and will spread, on a favourable site, to such 
an extent as will cover an inch or two square surface. When alive 
it “ appears like dew drops, and is easily separated from the shell by 
a pin ; but is strongly attached when dry.” Gray. In this state 
the aperture of the cells is sometimes closed by a membrane, the re- 
mains of the polype, which remains undescribed. 
2. H. lanceolata, cells slender , ovate-lanceolate, the aper- 
ture small and round. . Miss Elliot. 
Hippothoa lanceolata, Gray, Zool. Misc. 35. 
* A Nereid: — Hesiod. Theog. 251. 
'iffTcfioll t’ ipOiTV'J, ' 1 7T7T CjV G H \ C^OTTH C • 
The charming Hippothoa and rosy-armed Hipponoe. 
