181 



stronger than the others, lateral spine likewise with a coarse spinule near the 

 base followed by 3 much smaller ones. Posterior maxillipeds resembling in 

 shape those in the said species, though having the dactylar joint more pro- 

 duced. Natatory legs almost exactly as in H. finmarchica. Last pair of legs 

 likewise rather similar, the free joint being cylindrical in form, with 2 very 

 unequal apical setae. 



Body pellucid, of a whitish grey colour, with dark blue translucent 

 intestine. 



Length of adult female 1.20 mm. 



Male unknown. 



Remarks. This form is closely allied to H. finmarchica, but at once 

 distinguished by the much longer and narrower caudal rami, reminding in 

 this respect on Pseudanthessiiis Thorelli Brady. 



Occurrence. Only a single female specimen of this form has hitherto 

 come under my notice. It was taken, many years ago, off the west coast of 

 Norway, the exact locality not having been noted, and a coloured drawing was 

 at that time made from the specimen, when still alive. 



Gen. 43. Pseudomolgus, G. O. Sars 1916. 



Generic Characters. General form of body resembling that in the 

 preceding genus, the anterior division being more or less expanded, the 

 posterior slender and attenuated. Cephalon well defined from the 1st pedige- 

 rous segment and produced in front below to an obtuse incurved rostrum. 

 Anterior antennae slender and generally composed of 7 articulations clothed 

 with comparatively short setae. Posterior antennae unusually short and stout, 

 with the outer joints imperfectly separated, apical claws exceedingly strong, 

 hooked and distinctly biarticulate. Maxillae with the masticatory part appar- 

 ently bifid, an appendicular lappet being inserted inside the principal one 

 and, like the latter, produced to a slender incurved lash; principal lappet 

 coarsely denticulate along the outer edge; palp small, lamellar. Anterior 

 maxillipeds with the terminal process short and armed with a limited number 

 of subequal spinules. Posterior maxillipeds in female imperfectly developed, 

 sub-lamellar, and apparently quite immobile; those in male, as usual, well 

 developed, prehensile. Natatory legs with the rami rather broad and subequal 



24. Crustacea. 



