HiprOTHOA. Z. ASCIDIOIDA. 265 



Milne-Edwards refers this species to Sertularia, section Dyname- 

 na, but 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. CATENULARiA, " 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. 423 Hippothoa catenularia, Flem. Br. Anim. 334. 



H. EUiotae, Gray, Zool. Misc. 34. 



ffah. 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 lanccolata, Gray, Zool. Misc. 33. 



* A Nereid -.—//esiorf. Tbeog. 251. 



The charming Hippothoa and rosy-armed Hipponoe. 



