298 "TERRA NOVA" EXPEDITION. 



pair and five in the eighth, nail distinct, outer corner of the basal joint of the 

 exopod rounded. 



Sixth abdominal somite one and three quarter times as long as the fifth. 



Telson slightly longer than the sixth abdominal somite, and more than twice 

 as long as broad at the base, cleft for about one-quarter of its length; the cleft armed 

 with two plumose setae and with about 26 teeth on each margin; lateral margins of 

 the telson armed with 26 spines more or less regularly arranged along their entire 

 length, the terminal spines not very much larger than the remainder. 



Inner uropod about one-fifth longer than the telson, with about 15 spines on the 

 inner margin extending from the statocyst almost to the apex, proximal spines placed 

 closer together and smaller in size than the distal spines. 



Outer uropod one-third longer than the telson and conspicuously broader than 

 in most of the other species. 



Exopod of the fourth pair of pleopods of the male with a strong modified seta on 

 each of the antepenultimate and penultimate joints, terminal joint small with two 

 long single setae. 



Length of adults of both sexes, 12 mm. 



Remarks. — This is one of the most distinct of tlie species of the genus. The long 

 acute rostrum and the spiniform apex to the antennal scale are quite unlike the same 

 parts in any of the other species. It is a larger and more robust form than 

 the majority, and is apparently littoral in habit. 



20. Tenagomysis scotti, sp. nov. (PI. IV. figs. 6-11.) 



Occurrence. — Station 85, five ; Station 86, one ; Station 9.3, thirty-six ; Station 

 120, one ; Station 122, four. All from north of New Zealand. 



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

 lateral corners rounded, front produced into a short acute rostral plate with a blunt 

 apex, extending half-way along the basal joint of the antennular peduncle, no 

 pseudorostral projection. 



Eyes normal, cornea occupying rather more than half the entire eye, pigment 

 reddish brown rather than black. 



Antennal scale extending beyond the antennular peduncle by about one-third 

 of its length, narrowly lanceolate in form with apex obtuse, seven times as long 

 as broad, an inner and an outer spine on the basal joint from which the scale 

 arises. 



Antennal peduncle not longer than the first two joints of the antennular. 



Thoracic limbs long and slender, tarsal joint composed of four articulations in 

 addition to a long and slender but distinct dactylus, a small spine on the outer corner 

 of the basal joint of the exopod. 



Sixth abdominal somite one and a half times as long as the fifth. 



Telson as long as the sixth abdominal somite, deeply channelled dorsally, twice as 



