140 CANON A. M. NOEMAN ON 



urosonie, where they are subequal in length to the breadth of the body. All tbe 

 processes described have the outer margin ciliated. Last segment of urosome is rather 

 more than half the length of the preceding. The caudal rami are very long and slender, 

 equal in length to two and a half preceding segments, bearing on the middle of the outer 

 margin a spinule, and at the extremity four minute spines, and centrally a very long 

 spine, so that the whole length of the ramus is as long as the whole of the rest of the 

 body. 



The 1st antennce are 3-jointed and slender. The 1st joint has at the extremity of the 

 lower margin a small denticulation, and in some specimens there is also a small curved 

 process near the commencement on the outer side of the 2nd joint. The posterior 

 antennce are 2-jointed, devoid of a secondary branch, slender, and 2nd joint longer than 

 the 1st. Hinder maxillipeds very slender and long, nearly parallel-sided ; nail very 

 long and slender. The legs are all remarkable from the 2nd basal joint being produced 

 outwards to a considerable extent, so that the attachment of the inner branch is far 

 removed from that of the outer. 1st pair has the inner branch twice the length of the 

 outer; its basal joint is without setae, 2nd joint terminates in three setae. The outer 

 branch has the 1st joint rather more than half the length of the 2nd, and bears one seta 

 on the outer margin ; the 2nd joint has two setae on the outer side and three terminal. 

 In the 2nd, 3rd, and 4ith pairs the inner ramus is very much shorter than the outer and 

 terminates in two or three setae. Its 1st joint is not more than one-third or one-fourth the 

 length of the 2nd. The 5th pair has the outer limb very long and linear, more than six 

 times as long as broad, and carries two setae on the outer margin, one on the inner and 

 two terminal. The simple seta of the exterior margin of the basal joint is of great size. 

 The inner lobe of the basal joint is long and slender, about equal to half of the outer 

 joint ; it is furnished with two setae on the inner margin and two apical. 



Length of female - 8 mm. 



The male I have not seen. Sars describes it as " smaller than female, and with the 

 anterior antennae distinctly hinged, 5-articulate, 3rd joint slightly dilated, last joint 

 claw-like. Inner ramus of 2nd pair of legs armed at the tip with a somewhat flexuous 

 claw-like spine in addition to the setae. Last pair of legs much smaller than in female, 

 one of the setae wanting on the outer side of distal joint, proximal joint without any 

 expansion inside." 



This species was first dredged by me in the Firth of Clyde, in 1S88, among a mass of 

 decaying weeds on the east side of Little Cumbrae. In 1890 1 again met with it in the 

 Varanger Fiord in East Finniark, and Sars has met with it in several places on the 

 Norwegian coast. 



Genus Akthropsylltjs, G. 0. Sars. 



Body flanked each side with a series of acutely produced lappets arising from the 

 lateral parts of all segments except the last two. Cephalic segment with a broadly 

 triangular rostral projection, antero-lateral corners rounded off. Antennules in female 

 3-jointed, those of male strongly hinged. Antennae somewhat robust. Legs with 



