368 Mr. H. J. Carter on Specimens 



tration of the "Group" at p, 194 (i*Z>«y.), which is herewith 

 done and named for this purpose. I expect that the species 

 is common ; but it differs from the group " Digitata," which is 

 even perhaps still more common, in the processes being hollow 

 or tubular instead of solid ; that is, the vents of the excretory- 

 system open interiorly into the general tube ("cloaca," Bk.), 

 terminating at the extremity in the former, instead of here and 

 there, laterally, along the outside of the cylindrical process in 

 " Digitata." 



ECHINONEMATA. 



Halichondria flumosa^ Johnston. 



A small patch of the microcioniform variety (see Bower- 

 bank's ' British Spongiada3,' 1874, vol. iii. pi. xxiv. hgs. 7- 

 13), about three quarters of an inch in diameter. 



Loc. Gulf of Manaar. 



Ohs. In company with Microciona affinis and HymerhapMa 

 unispiculum, each about the same size, also Leucortis indica^ 

 Hackel, a calcareous sponge, and Polytrenia cylindrica^ growing 

 together on a Melobesian nodule about 1^ inch in diameter. 



HymerhapMa eruca. 



Of this sponge only one small specimen was found among 

 the first set of Melobesian nodules that I examined ; but in 

 these, the second set, it has been found in three or more places 

 in abundance ; so the existence of this remarkable species is 

 thus established. 



Loc. Basse Rocks. 



HOLORHAPHIDOTA. 



AynorpMna megalorhapMsj n. sp. 



Massive, irregularly lobed, tender, white. Surface irre- 

 gular. Structure amorphous, confused; traversed by branches 

 of the excretory canal systems, which are large and terminate 

 respectively in scattered vents. Spicule of one kind only, viz. 

 acerate, curved, fusiform, gradually sharp-pointed, smooth ; 

 varying in length from 1-1 28th to l-23rd inch. Size of 

 specimens about ] \ inch in diameter each way. 



Hab. Marine. Growing over Balani and sea-bottom. 



Loc. Basse Rocks. 



Ohs. This seems to be a variety of the common British 

 species Halichondria panicea, chiefly differentiated by the size 

 of its largest spicules, which is double that of the English 



