HYALONEMA (PRIONEMA) AGUJANUM. 



253 



GASTRAL AND DERMAL PINULES OF HYALONEMA (PRIONEMA) AGUJANUM. 



Besides the dermal and the gastral pinules described above, a considerable 

 number of other pinules were found adhering to the surface or embedded in the 

 superficial parts of the sponge. Some of these have long and bushy distal, and 

 very short lateral rays. In others the distal rays are quite short and very 

 slender and the laterals long. The former, which are quite frequent, resemble 

 the pinules of Hyalonema tenuifusum and probably belong to that sponge, which 

 was trawled at the same station; I accordingly consider them as foreign. The 

 latter are rare. They may be proper to the sponge and would, in that case, 

 have to be considered as transitions between the dermal pinules and the micro- 

 hexactines. Dermal transitional pinules, if such, have been found in both forms 

 of var. tenuis and in var. lata. The dimensions of the few observed are: — 



' The single specimen of var. tenuis form B is not sufficiently well-preserved for a reliable distinction 

 between dermal and gastral pinules; hence special measurements are not given. 



