82 THE VOYAGE OF H.M.S. CHALLENGER. 



Stenohelia, Kent (revised by Moseley). 



Stenohelia 'profunda, Moseley (PI. XII. figs. 1-4). 



Coenosteum very delicate, with fine granular surface. Tubular gastropores very long 

 in proportion to the width of their mouths, and extremely deep. From twelve to six- 

 teen dactylopores in each system. Dactylopores very narrow and slit-like. Ampullae in 

 the angles of the junctions of the branches, often projecting far, and somewhat thorn- 

 like in aspect, having the appearance of being rudimentary branches, converted to several 

 purposes. In some specimens, possibly males, the ampullae are covered all over with 

 pointed tubercles. 



Extreme height of the coenosteum about 25 mm. 



Station 23. Off St Thomas, Danish West Indies. 450 fathoms. 



Station 191. Off the Kermadec Islands, lat. 28° 33' S., long. 197° 50' W. 600 

 fathoms. 



Conopora, Moseley. 



Conopora tenuis, Moseley (PL XII. figs. 5, a, b, 6). 



With character of the genus (p. 97 of the present memoir). Dactylopores in each 

 system from twelve to fifteen in number. 



Station 170. Off the Kermadec Islands. 520 fathoms. 



Astylus, Moseley. 



Asti/Jus subviridis, Moseley. 



One small specimen only. 



Station 214. Off the Meangis Islands. 500 fathoms. 



Cryptohelia, M.-Edw. and H. 



Cryptohelia pudica, M.-Edw. and H. 



A considerable quantity of specimens was obtained from both these localities. 

 The East Indian specimens appear to differ almost constantly from the Atlantic ones in 

 having the margin of their cyclo-systems thin, laminar, and overhanging the exterior. In 

 the Atlantic specimens it is rounded inwards. The East Indian specimens thus seem to 

 possess the peculiarity which Milne-Edwards and Haime elevated into a generic one 

 in their Endohelia. I do not refer the forms to separate species in the absence of 

 knowledge of the soft parts of the Eastern form. 



