436 • PROF. J. A. TDOMSOX AND MR. W. D. HENDERSON ON [Apr. 10, 



Loccdllij. St:itioii 12, 



Pi'eviously recorded from ZanzibMr {Rousseau) ; Nossi Be in the 

 Mozambique Channel, 10-12 fathoms {Keller). 



CcELOGORGiA KEPENS, sp. n, (Plate XXXI. fig. 1 .) 



Several spreading colonies hardly exceeding 6 mm. in height. 

 There are numerous polyps, in some groups of which it is 

 impossible to distinguish the primary axial polyp from the 

 others. The smallest polyps are mere papilla? 1*5 mm. in height, 

 rising from a basal membrane ; the longest project freely for 

 6-8 mm. An average breadth is about 1 mm. The surface is 

 glistening white, and even to the naked eye appears rough and 

 spicular. It is continuously covered with longitudinally disposed 

 spindles. 



On the upper part of the polyps there are eight longitudinal 

 lidges ending in triangular points, which bend inwards to foi-m a 

 kind of operculum over the inturned tentacles. Each ridge is 

 composed of a double row of spicules, and the components of each 

 row overlap so that there may be three abreast at any one place. 

 In the lower part of the polyp the grooves between the ridges are 

 sometimes pi-ominent and bordered by pairs of spicules from the 

 two adjacent ridges meeting like the letter V with the point 

 downwards. In other cases the lower part of the pol}'p seems to 

 be uniformly covei'ed. 



The shoit and broad tentacles are completely inturned ; they 

 bear about 6-8 rows of short conical pinnules (13-16 in a row) 

 covei'ing the whole of the oral surface. On the aboial surface 

 there are numerous minute spicules arranged in chevron. The 

 spicules of the general surface are spindles w^ith irregular spines 

 and waits. The following measurements wei-e taken of length 

 and breadth in millims. :— 0-75 X 0-08 ; 0-7 x 0-05 ; 0-4 x 0-04. 



There can be but little doubt that these sjDecimens represent 

 voung stages of colonies which have assumed an encrusting habit. 

 They differ conspicuously from C. jMlmosa not only in the habit 

 of growth, but in being rough and in having much larger spicules. 



Locality. Wasin, 



Section B. Pennatulacea. 



Family V I R fi u L A R 1 1 D .i?:. 



Virgvlaria mirahilis Lamouroux, xar.j^eduncuJata Kiilliker. 

 ,, midticalycina, sp. n. 



Family Pennatulid^. 

 Subfamily Pteeoeidin^. 



Fteroeides hrachycaidon Kolliker. 

 ,, rigklum, sp. n. 



,, ptdcheUidn, sp. n. 



