On Hydroida from Kerguelen's Island. 113 



ambulacralibus,liis numero duabus supra scutum teitium,quartum, 

 aliquando quinturn, unica supra cnetera, et supra quimque 

 margiuem pori ambulaci'alis primi (infrabrachialis) papillis 4-5. 

 Color albidus. 

 Disci diara. 9 millim. 



Hah. Swain's Bay. 



The spines on the rays are very small, and similar to 

 those described by Ljungman as existing in 0. Lymani, 

 which cannot be confounded with the present species, as it 

 differs in size, length of the arms, form and size of the radial 

 shields, &c. 



XII. — Descriptions of some new Species of Hydroida from 

 Kerguelen s Island. By Professor Allman, M.D., LL.D., 

 F.R.S., P.L.S. 



Seven species of Hydroida were collected recently in Ker- 

 guelen's Island while the English Transit Expedition was 

 there. They comprise one representative of the Gymnoblastic 

 and six of the Calyptoblastic hydroids. None of them has 

 been previously described ; and one is the type of a new genus. 

 I reserve figures and full particulars res])ecting them for 

 my formal report upon the collection, giving merely short 

 descriptions of them here. 



Hydroida Calyptoblastea. 



Genus Seetularella, Gray. 

 Sertidarella keryitelenensis, n. sp. 



Trophosome. Hydrocaulus about an inch in height, much 

 and irregularly branched, monosiphonic ; internodes with 

 shallow annulations at their proximal ends. Ilydrothecse 

 springing each from an internode close to its distal end, some- 

 what tumid below, tapering towards the summit, which is 

 slightly incurved towards the stem ; orifice with four distinct 

 teeth. 



Gonosome. Gonangia springing each from a ])oint just below 

 a hydrotheca, subsessile, ovoid, Avitli a short tubular 4-toothed 

 summit, annulated, the annulations becoming obsolete towards 

 tlie base. 



Hah. Swain's Bay [Eaton). 



Nearly allied to S. polyzonias. 



