116 Prof. G. Busk on new Species of 



XIII. — Descriptions of some )iew Species of Polyzoa from. 

 Kerguelen^ s Island. By Professor G. BuSK, F.R.S. 



The collection of Polyzoa made in Kerguelen's Island during 

 tlie stay of the British Transit-of- Venus Expedition contains 

 twenty-six species and four varieties of a twenty-seventh, all 

 of which, excepting six species and three of the varieties, have 

 been previously described. Most of them are common to the 

 southern extremity of America; afeware also European, South- 

 African, Australian, or New-Zealand species ; but I do not 

 observe a single Arctic form among them, which is rather sur- 

 prising, since two or three species that inhabit the Arctic sea 

 are known to exist in the Antarctic regions also. I fancy 

 their absence is due to the circumstance that the collection 

 was made exclusively in the Laminarian zone, the majority 

 of the specimens having been obtained by a ten-tooth grapple 

 attached to six fathoms of cord cast from the shore. 



The following are the novelties. Figures of them and of 

 some otlier species will be given in my full report upon the 

 collection. 



Suborder Cheilostomata. 



Fam. Salicornariadae. 



Genus Onchopora, Bk. (restricted). 



Type Onchopora Sinclairii^ Bk. 



The genus Oncliopora as originally constituted embraced 

 Tubulicellaria of D'Orbigny ; but I now propose to confine it to 

 those forms which have no tubular prolongation of the mouth, 

 which certainly constitute a very distinct type. 



Fam. Flustradse. 

 Genus Diachoris, Bk. 



Diachoris costata, n. sp. 



Cells elongated oval, posterior surface glistening ; aperture 

 protected by nine to twelve acute, sometimes furcate cost^e, 

 which arch over and interdigitate in the middle line ; four to 

 six strong oral spines ; a pedunculate reclinate aviculai-unn 

 on one or, more usually, both sides, near the upper part of 

 the cell. 



Hab. Swain's Bay, Kerguelen's Island [Eaton) ; Falkland 

 Islands ( Darivin) . 



The cells have some resemblance to those of Bcania australis^ 



