296 "TERRA NOVA" EXPEDITION. 



Antennular peduncle short and stout, outer distal corner of the basal joint 

 produced into a lobe almost as long as the second joint and tipped by three setae. 



Antennal peduncle equal in length to the antennular. 



Antennal scale longer than the antennular peduncle, extending forward in the 

 male to the level of the anterior end of the hirsute lobe, ovate-lanceolate in shape,* 

 setose all round, four times as long as broad, terminal joint distinct, a prominent 

 spine on the outer corner of the basal joint from which the scale arises. 



Tarsal joint of the thoracic limbs divided into two articulations in the third pair, 

 into three articulations in the remaining pairs, nail in all the limbs distinct and 

 moderately long. 



Sixth segment of the abdomen nearly twice as long as the fifth and only slightly 

 longer than wide. 



Telson as long as the sixth abdominal somite and one and a half times as long 

 as broad at the base, cleft for one-fifth of its length ; cleft armed with a pair of plumose 

 setae and with 8-11 teeth on each margin ; lateral margins of the telson armed with 18-20 

 spines more or less regularly placed throughout the entire margin, the terminal 

 spine about one-tenth of the length of the telson. 



Inner and outer uropods subequal in length, about one and a half times as long 

 as the telson, inner uropod with a row of closely set spines on the inner margin, about 

 30 in number, extending from the statocyst to the apex. 



Exopod of the fourth pleopods of the male with a modified seta on each of the 

 antepenultimate and penultimate joints, terminal joint small, bearing one long seta. 



Length of an adult male, 7 mm. 



Remarks. — This species is distinguished by its small robust form, the relative 

 length and stoutness of the antennular and antennal peduncles and their relative 

 proportions, the antennal scale, the small obtuse rostrum, the shape and armature of 

 the telson and the subequal uropods. 



18. Tenagomysis thomsoni, sp. nov. (Plate IV, figs. 12-16.) 



Occurrence. — North of New Zealand. Station 128, one. Stations 132-133, 135- 

 136, many. 



Description. — Carapace leaving the last two thoracic somites exposed, antero- 

 lateral corners rounded, front margin produced slightly as a low obtuse-angled triangle 

 with the apex broadly rounded and the sides almost straight, no pseudo-rostral process 



Eyes normal in form, rather small, cornea rather less than one-half of the 

 complete eye, pigment black. 



x\ntennal scale equal in length to the antennular peduncle, narrowly lanceolate 

 in shape, setose all round, eight times as long as broad, tip obtuse, distal joint distinct, 

 an inner and outer spine on the basal joint which carries the scale. 



Terminal joint of the antennular peduncle relatively longer than in any of the 

 other species almost as long as the basal joint 



