378 DR. W. T. CALMAN ON NEW OE EAEE 



The uropods have the peduncle more than twice as long as the last somite, with a 

 single spinule at its distal inner corner; the rami are subequal, shorter than the 

 peduncle. The exopod has a long terminal spine, with two short ones on either side 

 of it. The endopod is composed of tAvo segments, the proximal shorter than the 

 distal, fringed Avith fine setae on the inner edge, and with a terminal spine and three 

 or four spinules on the distal part of the inner edge partly hidden among the setaj. 



Adult Male. — Total length 2-7 mm. 



Carapace nearly one-third of total length, its vertical height about half of its length. 

 The free thoracic somites not so deep as in the female ; second and third pairs of legs 

 not separated. The penultimate thoracic somite has a marked median dorsal keel. 

 The posterior corners of the last somite are slightly produced and acute. The telson 

 is about three-fourths as long as the last abdominal somite ; it is produced well beyond 

 the anal valves, the post-anal part forming a tongue-shaped lobe, of which the outline 

 is continued forwards by two ridges on the dorsal surface of the telson. Two small 

 setse spring from the under surface, close to the tip, and there are some very fine 

 setae below the lateral margins. 



The antennules have the peduncle slightly increasing in diameter distally, the first 

 segment almost as long as the other two together, the last segment as broad as it is 

 long and bearing a dense tuft of sensory filaments ; the outer flagellum is more than half 

 as long as the peduncle and consists of four subequal segments ; the inner flagellum 

 is more than half as long as the outer and also consists of four segments, of which the 

 first and last are very small. The antennae are about as long as the body ; the last 

 two segments of the peduncle are indistinctly separated and the sensory setae which 

 they bear are small and few in number. 



Both pairs of pleopods are biramous, the outer ramus in each case of two segments. 



The uropods have the peduncle nearly three times as long as the last segment, 

 with about nine spinules interspersed with minute setae on the inner edge ; the 

 rami are less than two-thirds as long as the peduncle ; the endopod has on the inner 

 edge six spinules on the first segment and seven on the second, with very minute 

 setae between. 



Occurrence. — New Zealand, " Lyttleton Harbour, 1-5 fathoms, 8/97," "Akaroa 

 Harbour, 6 fathoms, 8/97." H. Suter Coll., Copenhagen Museum. Co-types in 

 British Museum. 



Genus Diastylopsis S. I. Smith. 

 The two species described below conform in general characters to Zimmer's re- 

 definition of this genus (Cumaceen der Deutschen Tiefsee-Exp. p. 189, 1908), except 

 in having a very inconspicuous antennal notch. This character, combined with the 

 elongated and perfectly smooth carapace, without teeth or ridges on the surface, 

 suffices to distinguish them from all the species referred to the genus. 



