17 



the length of the body, and, viewed dorsally, exhibiting a very slight dilatation 

 in front of the middle, frontal edge somewhat produced between the insertion 

 of the antennae. Tail exceeding half the length of the exposed part of the 

 trunk; genital segment rather large, being considerably longer than the remaining 

 part of the tail, and gradually narrowed behind, dorsal face with a very slight 

 transverse suture in the middle; ovigerous spines unusually short. Caudal 

 rami comparatively small and somewhat divergent, each provided with 6 setae, 

 one of which, however, is very short and attached somewhat dorsally. Eye 

 easily observable in the living animal, though of a somewhat incomplete structure, 

 lateral lenses small and rather remote from each other, being connected by 

 a narrow stripe of dark pigment, ventral lens apparently imperfectly developed. 

 Antennae rather shorter than in the species described in the preceding pages, 

 not even attaining half the length of the cephalic segment, and only composed 

 of 4 joints, the last of which is about as long as the other 3 combined and 

 somewhat fusiform in shape, with none of the setae ramified. Oral tubule 

 occurring unusually far in front, at about the end of the first */3 of the cephalic 

 segment. Natatory legs without any denticle inside the 2nd basal segment, 

 outer ramus considerably longer than the inner and having the terminal 

 joint well developed, with the outer edge perfectly smooth. Last pair of legs 

 somewhat clavate in outline, the inner edge forming a rounded expansion 

 immediately inside the extremity, apical setae 3 in number and of nearly 

 equal size. 



Body in the living animal rather transparent and in some places tinged 

 with a light yellow pigment. 



Length of adult female reaching to 3.55 mm. 



Male unknown. 



Remarks. The present species is easily distinguished from those described 

 in the preceding pages by the comparatively shorter antennae, the position of 

 the oral tubule, and the shape of the last pair of legs. The tail, moreover, 

 appears more elongate and the genital segment of larger size than in those species. 



Occurrence. Some few specimens of this form, all of the female sex, 

 were collected, many years ago, in 2 different places on the Nordland coast, 

 viz., Valdersund and Kval0. 



Distribution. Mediterranean (Giesbrecht) Scottish coast (Scott). 



Crustacea. 



