

210 



and obliquely truncated at the end, inner expansion of proximal joint less broad 

 and only provided with 5 marginal setae. Ovisac generally rather large, though 

 containing a limited number of ova. 



Male with the inner ramus of 3rd pair of legs transformed in a similar 

 manner to that in the type species. Last pair of legs with the inner expansion 

 of proximal joint scarcely extending as far as the distal joint, and only provided 

 with 2 spiniform setae. 



Colour dark yellowish grey. 



Length of adult female 0.38 mm. 



Remarks. This form was rather imperfectly described by Clans as a spe- 

 cies of the genus Dactylopus. Boeck justly removed it from that genus, and in- 

 cluded it in his new genus Mesochra. Indeed, saving the distinctly 3-articulate 

 inner ramus of the 1st pair of legs, it agrees in all essential characters closely 

 with the type species, M. Lilljeborgi. The Canthocamptus parvus of Scott is un- 

 questionably identical with the present species. 



Occurrence. I have met with this very small form not unfrequently along 

 the whole south and west coast of Norway, at least up to the Trondhjem Fjord 

 in moderate depths among algae. It is a strictly marin form, being scarcely ever 

 found in brackish water. In the living state it is readily observed by its dark 

 colour. 



Distribution. Heligoland (Glaus), Scottish coast (Scott), Franz-Josef Land 

 (Scott). 





133. Mesochra hirtieornis (Scott). 



(PI. CXXXVII). 



Chanthocanwtus hirtieornis, Scott, Thirteenth Rep. Fishery Board for Scotland, Part III, p. 251, 



PI. IX, figs. 1326. 



Syn : Canthocamptiis megalops, Lilljeborg. 



Specific Characters. Female. Body comparatively short and somewhat 

 depressed anteriorly, tapering gradually behind. Rostral projection well marked, 

 obtusely rounded at the tip. Urosome much shorter than the anterior division, 

 last segment scarcely as long as the preceding one. Caudal rami about as long 

 as they are broad at the base and slightly contracted behind, apical setse of 

 moderate length. Eye unusually large. Anterior antennae short, 7-articulate, 

 resembling in structure those in M. Lilljeborgi. Posterior antennae likewise .almost 

 exactly as in that species. Mandibular palp with the distal joint not defined from 



