CUMACEA FEOJ[ THE COPENHAGEX MUSEUM. 27 



The second legs are stout and not shorter than the succeeding pair. They have all 

 seven segments distinct. The basis is a little shorter than the remaining segments 

 together. The carpus and propodus are short and subequal, and together equal the 

 ischium in length. The terminal segment is longer than the ischium, about three 

 times as long as broad, and armed distally with three long and some shorter spines. 



The remaining pairs of legs diminish in length posteriorly, the basis of the last 

 pair being not much more than half as long as that of the third pair. 



The uropods are slender, the peduncle slightly curved and longer by one-third than 

 the last somite. The exopod is nearly three-fifths of the length of the peduncle and 

 terminates in two unequal spines ; its inner edge bears one or two long feathered 

 setae. The endopod is three-fourths as long as the exopod, composed of two segments, 

 the distal little more than one-third of the length of the proximal ; it terminates in a 

 long spine and has three short spines on its inner edge. 



Adult Male. — Total length 2-7 mm. 



The carapace is about one-fourth of the total length, its vertical height less than 

 two-thirds of its length. Seen from the side it differs from that of the female in having 

 the dorsal outline less strongly arched and not elevated at the posterior end. The 

 ridges on the side of the carapace are only faintly indicated and the surface is smoother 

 than in the female. The ocular lobe is much larger and more prominent. The eye 

 is deeply pigmented and not completely separated into two portions ; nine large corneal 

 lenses are visible from above. 



The first and second leg-bearing somites are subequal in height and much lower than 

 the posterior part of the carapace. 



The abdominal somites are much stouter than in the female, with well-marked 

 pleural plates fringed with rather long hairs posteriorly. 



The antenna is of the usual structure and its flagellum is equal in length to the body. 



The branchial apparatus differs greatly from that of the female, having about nine 

 very broad lamellar lobules, increasing in size posteriorly and each truncate at the tip. 

 The branchial siphon is similar to that of the female. 



The first leg has the basis longer than in the female, about equal in length to 

 the remaining segments together. 



The pleopods are of the usual structure. 



The peduncle of the uropods is a little shorter than in tbe female and the exopod is 

 a little more than three-fifths of its length. The inner edge of the peduncle has a 

 fringe of feathered setie. The endopod has six spines on the inner edge. 



Eemarks. — The two long branchial siphons projecting from the anterior corners of 

 the head give this species a very remarkable appearance and distinguish it at once from 

 any Cumacean hitherto described. Apart from the branchial system, however, its 

 structiu'e does not seem to be in any way unusual. 



The separation of the two branchial siphons, though nowhere else so marked, will, I 



e2 



