138 AMrniPODA normalia. 



more than half as long as the superior ; peduncle as long as the 

 peduncle of the superior. Gnathopoda slender ; propoda scarcely 

 hroador than caqn. First ])air having the propodos ovate ; palm 

 not obli(]ue, convex, fringed with short fine cilia ; there are two 

 rows of short shaq) spines, one near the inferior angle, the second a 

 little posterior. Second pair having the propodos long-ovate ; palm 

 obh(|ue ; inferior angle defined imperfectly by a lateral row of short 

 spines. Three posterior pail's of pereiopoda haWng the dactj'los 

 in each directed anteriorly. Posterior pair of pleopoda naked, 

 and considerably longer than the two precechng pairs. Telson 

 long, deft for about two-thirds of its length. 

 Length ^ths of an inch. 



Hah. Sydney {Antarctic Expedition). 



7. Atylus inermis. (Plate XXVI. fig. 5.) B.M. 



Amphitoe inemiis, Kriiyer, Amjij}. Gron. iii. p. 47. pi. 3. f. 11. 

 Edw. Hist, des Crust, iii. p. 34. 



Doi-sal siu'face not toothed. Rostnim between the superior antenna? 

 nidimentaiy. Eyes ovate. Superior antenna? one-third shorter 

 than the inferior ; peduncle half as long as the flagellum ; articuli 

 of the flagellum rather longer than broad, each carrj-ing, at the 

 upper and under distal extremities, a curved seta, and every 

 alternate one also cariying a pair of auditory cilia. Inferior 

 antennse about half as long as the animal ; peduncle rather longer 

 than the peduncle of the superior; articuli of the flagellum broader 

 than long, each carrying ciu'ved seta? on its upper and under sides. 

 Gnathopoda subequal, slender, each having the carpus as long as the 

 propodos ; the propodos long and narrow ; palm obhque, laterally 

 fringed with cilia, and defined by two short sharp spines. Three 

 posterior pairs of pereiopoda having theii' dactyla dii-ected an- 

 teriorly. Three posterior pairs of pleopoda gradually increasing 

 in length, ciliated. Telson deej)ly cleft. 



Length ^ths of an inch. 



Hah. Sukkertopper, Greenland {Holholl and Kroyer) ; North 

 Atlantic {Mr. Barrett) ; Banflf {Mr. Edward). 



The figui'e and description are taken from an unnamed specimen 

 presented to the British Museum by M. HolboU. In a comparison 

 with Kroyer's figure and Edwards's description, the only observable 

 difference consists in the extreme points of the telson in oiu" specimen 

 being shai'p, whereas they represent them as obtuse ; but this is a 

 diff'ercnce unimportant in itself, and one that might be produced by 

 friction, as is often actually the case. 



Under the microscope, the surface of the integument is covered 

 with small crescent-shaped scales. 



