183 



forming a somewhat irregular short lamella carrying 2 small setae, one outside 

 and one at the tip, inner edge with an angular projection in the middle. 

 Anterior maxillipeds with the termimal process divided into 5 slender subequal 

 spinules. Posterior maxillipeds without any armature whatever, each forming 

 a simple somewhat lamellar stem terminating in a minute point. Natatory 

 legs with the 1st joint of the outer ramus distinctly denticulated outside; 

 terminal joint of inner ramus in 1st pair with one, in 2nd pair with 3, and 

 in the last 2 pairs with 4 spines; all the spines distinctly dagger-shaped. Last 

 pair of legs with the free joint narrow oblong in form, edges partly ciliated, 

 marginal spines rather slender, that of the outer edge attached at about the 

 posterior 4th part of the joint. 



Male, as usual, of smaller size than female, and having the genital 

 segment considerably dilated. Posterior maxillipeds powerfully developed, with 

 the propodos coarsely denticulated along the whole inner edge, dactylus long 

 and curved. 



Colour not yet ascertained. 



Length of the female here described about 2 mm.; that of male 1.50 mm. 



Remarks. This species has recently been briefly mentioned and figured 

 by the present author in the above-quoted journal from a female specimen 

 procured during the Monaco Expedition. It is closely allied to the type species, 

 P. arenicola. (Brady), but easily distinguished by the comparatively broader 

 and more expanded anterior division of the body, and more particularly by 

 the much more produced caudal rami. The structure of the several appen- 

 dages seems to agree very closely with that in the type species, except that 

 the anterior antennae are distinctly 7-articulate, whereas these antennae in 

 P. arenicola, both according to Brady and Scott, are only composed of 6 joints. 



Occurrence. A solitary adult female specimen of this form (that here 

 figured) was taken, several years ago, in the inner part of the Trondhjem Fjord, 

 at Vennaes, from the considerable depth of 100 150 fathoms, and recently 

 some few young female specimens and an adult male were picked up from 

 the bottom-residue of a large collecting bottle containing various animals col- 

 lected by Mr. Kjaer in the Christiania Fjord, near Dr0bak. 



Distribution. Off the Amsterdam island, Spitsbergen (Monaco expedition). 



