CAULOPHACUS. . 47 



The nearest ally to this sponge appears to be Holascella ancorata. From 

 this it is distinguished by its superficial hexactines having more slender distal 

 rays, by its discohexactines having smoother rays and larger terminal anchor- 

 teeth, by the terminal spines of its onychhexactines and hemionychhexasters 

 being much longer, and by possessing no floricomes. On account of its general 

 similarity to Holascella ancorata I assign it to the genus Holascella. It must, 

 however, be borne in mind that the fragmentary condition of the specimen 

 precludes the possibiUty of saying with certainty whether it really belongs to 

 this genus, for if the sponge of which it formed part should have been destitute 

 of a root-tuft, which is quite possible, it would have to be placed in Corbitella or 

 another genus of the Corbitellinae. In this respect it is noteworthy that its 

 discohexactines are rather sinular to the discohexactines of Corbitella (Eudictyon) 

 elegans Marshall.^ 



CAULOPHACIDAE F. E. Schulze. 



Wineglass- or mushroom-shaped Hexasterophora with a firm stalk; soli- 

 tary or forming branched colonies. With dermal pinules and large hypodermal 

 pentactines. 



The collection comprises thirty more or less complete specimens and eighty- 

 three fragments of specimens of this family. The position of three of the latter 

 is doubtful. The others belong to the three genera Caulophacus, Caulophacella, 

 and Calj^cosilva; the last two of these are new. 



CAULOPHACUS F. E. Schulze. 



Mushroom-shaped Caulophacidae with hollow stalk, discohexasters, and 

 microdiscohexactines . 



There are twenty-eight more or less complete specimens and forty-nine 

 fragments and stalks of Caulophacus, all of which belong to the same species. 



' W. Marshall. Untersuchungen iiber Hexactiuelliden. Zeitschi-. wiss. Zool. Suppl., 1875, 25, 

 p. 211, 212, taf. 16, figs. 66 a-1. /. Ijima. Studies on the Hexactinellida. II. Journ. Coll. sci. 

 Tokyo, 1902, 17, p. 11-16, pi. figs. 13-15. 



