00 AKT. 7. — I. IJIMA : JlEXACTIx\ELLIJ)A, lY. 



])Ut of this later. — The apertures of iiicurrent caual»-!, visible 

 lliroiigh the dermal layer, are small, not exceeding 2 mm. in 

 diameter, even in the middle of the bodv where the lanrefet 

 oecu r. 



On the gastral surface the apertures of excurrent canals 

 open freely. Near the oscular margin they are all small; lower 

 down, larger ones add themselves to the small, and in the lower 

 half of the cavity the largest may measure 4-5 mm. across. 

 Centrally at the very bottom there exists a space occupied by a 

 few small apertures only ; peripherally it runs out into five or 

 six, septa-like, radial ridges, the interspaces between which arc 

 taken up by closely crowded excui'rent apertui'cs. 



The compact stalk is traversed by a system of anastomosing 

 excurrent canals as in most Ci'afe}'oiiioi'i>ha (not simply tuljular 

 as in ('. thiei'f elder i). Externally it lacks the dermal layer 

 which must have fallen away. 



The sponge as preserved in alcohol is colorless. So also the 

 formalin specimen belonging to Mr. Owstox. It is pure while 

 after desiccation. Kuma states that the Sei. Coll. specimen, 

 which was obtained l)y him, was in the fresh state " yellow like 

 the yolk of a hen's egg." 



JJoth specimens examined by me contained a large colony or 

 colonies of Si/llis ramosa MTntosh. This remarkalde Annelid 

 seems to be seated mainly in the excurrent canal-system, stretch- 

 ing out in part into the gastral cavity. When the sponge is 

 dried it may still be recognized, as its colored body adheres to 

 the white sponge-tissue. The S])ecimens I have taken from the 

 C meyerl in possession of the Sei. Coll. were studied In' Prof. 

 A. Oka (Ueber die Knospungsweise der SyllU ra/nosa. — Zool. 

 Mag., Tokyo, Vol. Vll. [1895], p. 117). 



