75 



The genus is prominently characterised by the small size of the posterior 

 antennae and the imperfect development of the oral parts, as also by the 

 structure of the legs. Hesse records 2 species of this genus, C. flavus and 

 viridis, none of which seems to be identical with the 2 Norwegian species 

 here described. 



25. Cryptopodus brevicauda, (Canu) 



(PI. XXXV) 

 Aplostoma brevicauda, Canu, Copepodes de Boulonnais, p. 223, PI. XX, figs. 518. 



Specific Characters. Female. Body rather slender, with the anterior 

 division nearly cylindrical in shape, though gradually narrowed in its anterior 

 part; limits of the segments indicated by well-marked constrictions. Cephalic 

 segment comparatively small and less distinctly defined, terminating in front 

 in a minute tuberculiform prominence. Tail very short, scarcely exceeding in 

 length YB of the anterior division, and only composed of 2 distinctly defined 

 segments, the 1st rather broad at the base and rapidly tapered distally, the 

 2nd very small. Caudal rami somewhat divergent, each with a minute bristle 

 in the middle of the outer edge and another still smaller one at the apex. 

 Anterior antennae conical in form and apparently, composed of 4 joints, the 

 outer 3 quite short and clothed with small bristles. Posterior antennae much 

 smaller than the anterior, with the distal joint narrow linear in form and armed 

 outside with 4 minute denticles. Anterior lip with the hind edge quite smooth. 

 Ovisacs fully as long as the entire body, cylindrical in form, and more or less twisted. 



Body of the living animal rather opaque, of a pale rosy colour, with the 

 ovarial tubes of a somewhat darker hue. 



Length of adult female 2.50 mm. 



Remarks. The above-described form is unquestionally identical with that 

 recorded by Canu as the type of his genus Aplostoma. Canu has also ob- 

 served the male of this species, and has given good figures of it in the above- 

 quoted work. 



Occurrence. Some few female specimens of this peculiar Copepod were 

 taken, many years ago, at Espevaer, west coast of Norway. They were found 

 in the compound Ascidian, PolycUnum luteiim, lying within a diverticle of the 

 branchial sac of the Zooids. 



Distribution. Coast of France (Canu). 



