158 
or S-shaped; length very varying; 1 have measured up to ca. 400 
thickness 3-1 ^ or less „enus-determination of 
I am greatly m doubt as to the ngnt genus 
,he sponge in hånd, Ridley and Dendy (Chall. Rep.) cons.der the 
Fig. 31. Thrinacophora dubia nov. sp. a, styli; b, styli, c, rhaphides. 
only difference between Thrinacophora and other Axinellidae to be 
the faet, that the former possesses trichodragmata (also isolated rhap - 
ides?). The hitherto described species have well developed spicu a 
fibres and o x e a; but as this character is not inserted in the genus¬ 
definition, and as f. i. in Axinella species oceur both with and 
