MYSIDACEA— TATTERSALL. 299 



long as broad at the base, cleft for one-fiftli of its length; cleft rather wide and 

 armed with two plumose setae and with seventeen teeth on each margui; lateral 

 margins of telson armed with 17-19 spines, the two proximal of which are longer and 

 stouter than the succeeding spines except the terminal ones, which are one-tenth of 

 the length of the telson. 



Inner uropod one and a third times as long as the telson, a row of thirty spines 

 on the inner margin extending from the statocyst to the apex. 



Outer uropod about twice as long as the telson. 



Exopod of the fourth pleopods of the male with the penultimate joint twice as 

 long as the antepenultimate, the former joint alone possessing a single long, stout, 

 modified seta. No such seta is present on the antepenultimate joint as in most of the 

 other species of the genus. 



Length of adult specimens of both sexes, 9 mm. 



Remarks. — This species belongs to that group of the genus having the antero- 

 lateral angle of the carapace roimded, and in that group is distinguished by the length 

 of the antennal scale, the form of the rostrum, the shape and armature of the telson, 

 and the exopod of the fourth pleopod of the male. It appears to be also a more 

 oceanic species than the others. All the specimens were taken in townets in the 

 neighbourhood of Three Kings Island, and none in the vicinity of the mainland of New 

 Zealand. 



21. Tenagomysis feniiijies, Tattersall. 



T. tenuipes, Tattersall, 1918, p. 10, pi. XVIII, figs. 1-7. 



Occurrence. — Not taken by the "Terra Nova." The type and only known specimen 

 was taken by, the Australian Antarctic Expedition in Carnelly Harbour, Auckland Islands. 



Description. — Antero-lateral angles of the carapace rounded ; anterior margin 

 of the carapace produced into a triangular rostral plate with blimtly pointed apex, 

 shorter than the eyes, and about one-third of the length of the first joint of the 

 antennular peduncle. 



Antennal scale considerably longer than the antennular pedtmcle, eleven times as 

 long as broad, terminal joint minute but distinct. 



Tarsus of the third to the eighth thoracic limbs divided into 9-14 joints. 



Fourth pair of pleopods of the male with a long, stout, plumose seta on the ante- 

 penultimate and penultimate joints. 



Telson longer than the sixth abdominal somite, two and a half times as long as 

 broad at its base, cleft for one-fifth of its length, lateral margins armed throughout 

 their entire length with about thirty-six spines. 



Inner uropod one and a quarter times as long as the telson, inner margin armed 

 with a row of spines from the statocyst to the apex, closely set proximally, more 

 distantly placed distally and irregularly arranged in series. 



Outer uropod one and a half times as long as the inner. Length 21 mm. 



2x2 



