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



gastral cavity there is a thin skin-fringe, 4 mm. in height. The parenchyma contains 

 oxyhexasters with very short principals, and small discohexasters with many terminal 

 rays. The dermal membrane contains, besides many pentacts, some tetracts. The inner 

 surface of the efferent canals bears small rough oxyhexacts. The stalk is penetrated 

 by canals. Zebu (Philippines), 95 fathoms ; Japan. 



Species 2. Crateromorpha thier/elderi, n. sp. 



The hollow stalk, somewhat thicker than a goose-quill, passes gradually into a spindle- 

 shaped cup, about the size of a hen's egg. The sharp oscular margin bears a thin 

 dermal fringe. The outer surface of body and stalk is smooth ; the inner surface exhibits 

 the round variously-sized apertures of the efferent canals. The parenchyma contains 

 oxyhexasters with somewhat externally curved terminal rays and small discohexasters. 

 The dermal membrane contains rough tetracts and pentacts. Little Ki Island, 140 

 fathoms. 



Species 3. Crateromorpha murrayi, n. sp. 



A broad, superiorly campanulate cup larger than a man's fist, with a strong hollow 

 stalk as thick as a thumb, and a sharp smooth oscular margin. The external surface is 

 smooth ; the internal surface exhibits round, variously sized apertures of the efferent 

 canals. The parenchyma contains oxyhexasters with terminal rays somewhat curved at 

 their ends. The dermal membrane contains small rough pentacts, tetracts, and less 

 frequently diacts. The gastral membrane contains rough pentacts and tetracts. Little 

 Ki Island, 140 fathoms. 



Species 4. Crateromorpha tumida, n. sp. 



The superiorly expanded stalk bears an irregularly ridged cup, somewhat larger than 

 a fist. The supei'ior, irregularly frilled, smooth, and somewhat sharp oscular margin pro- 

 jects straight upwards. The parenchyma contains oxyhexasters in which the long 

 terminal rays are frequently curved at their extremities, and also discohexasters with 

 rather numerous Ions; terminals. The dermal membrane contains tetracts. and less 

 frequently diacts, or even triacts. Banda Islands, 360 fathoms. 



Genus 8. Aidochone, n. gen. 



Cylindrical or spherical cup-like forms, borne on long tubular stalks. The oscular 

 margin is folded backwards in such a way that a portion of the originally internal gastral 



