AULOSACCUS. 109 



mv Cüiitribution III., pp. 78-83, I have endeavored to show that 

 the Asconematidse had better be dissolved and that a number of 

 its genera, Calycosaccm for one, should be taken over by the 

 Rossellidœ. If I am right in so doing, Calycosaccus as a name 

 for a Eossellid genus seems to lose its claim for existence, as 

 was indeed anticipated by F. E. Schulze himself. Nothing more 

 than a specific value can be attached to the difference between 

 G. i/jimai and Ä. schulzei. 



It is with a much less degree of certainty that I refer A. 

 mitsukurii to the srenus. It differs decidedlv from both A. schulzei 

 and A. ijiniai in the possession of strong prostat needles and in 

 tlie comparatively small size of its macrodiscohexaster. That 

 these differences sufficiently warrant generic distinction seems to 

 me to be doubtful, so that the species may best be left for the 

 present in the genus to which it was originally assigned. 



Aulosaccus shows greatest afiinity to Scyphidium and Rossella 

 in that it possesses like these the two kinds of discohexasters, 

 but differs from both in having no pentactinic hypodermalia. 

 This negative character is also shared bv Aulochom under the 

 Rossellime, but that genus lacks the macrodiscohexaster. If A. 

 mitsukurii were only provided with pentactinic hypodermalia, I 

 should have no hesitation in referring it to Scyphidium and plac- 

 ing it l)y the side of S. longispina, which species it most closely 

 resembles in the rest of its characters. 



The three species of the genus may be distinguished as 

 follows : 



a. — Without coiiuli :ind needle-like prustalia. 



a'. — Dermalia, hexactins or predomiuanlly hexacliiis. Macrodiscohexaster may measure 

 400 !J. in diameter; its princijjals separate or represented by six heuîis[)lierical 

 bosses AiilosacciitS ijimai (F. E. ScH.). 



