MYSIDACEA— TATTERSALL. 297 



Antennal peduncle shorter than the first joint of the antennular. 



Thoracic limbs long and slender, tarsal joint divided into five articulations in 

 addition to a long, slender and distinct dactylus ; outer distal corner of the basal 

 joint of the exopod without a spine. 



Sixth abdominal somite slightly more than twice as long as the fifth. 



Telson four-fifths of the length of the sixth abdominal somite, and twice as long 

 as broad at its base, cleft for one-fifth of its length ; cleft armed with two plumose setae 

 and with about 27 teeth on each margin ; lateral margins of the telson armed throughout 

 their entire length by about 26-28 spines, the three proximal ones longer than the 

 succeeding ones except the terminal spines. 



Inner uropod one and a quarter times as long as the telson, with about 32 spines 

 on its inner margin extending from the statocyst to the apex, the proximal spines 

 closely set, the distal five or six more distantly placed. 



Outer uropod one and three-quarter times as long as the telson and one-third 

 longer than the inner. 



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

 on the antepenultimate and penultimate joints, the terminal joint small and 

 furnished with two small setae. 



Length of adults of both sexes, 8 mm. 



Remarks. — This species is distinguished from T. scotti by the shorter antennal 

 scale, longer terminal joint to the antennular peduncle, smaller ej'es, almost obsolete 

 rostrum, the number of spines on the margins of the telson and its cleft, and the 

 exopod of the fourth pleopods of the male. It is, moreover, a littoral species. 



19. Tenagomysis producta, sp. nov. (Plate III, figs. 13-18.) 



Occurrence. — Sandy pool. Bay of Islands, New Zealand, five males and five females, 

 10-12 imxi. 



Description. — A large robust species with the carapace leaving only the last 

 thoracic somite uncovered. Front margin of the carapace produced into a long acute- 

 angled triangular rostrum with sharply pointed apex extending to the distal end of 

 the first joint of the antennular peduncle, antero-lateral angles of the carapace 

 rounded, no pseudorostral process. 



Eyes large, normal, cornea occupying slightly less than the distal half of the 

 complete eye, pigment black. 



Antennal scale extending for at least half its length beyond the distal end of the 

 antennular peduircle, lancet-shaped, setose all round, six and a half times as long as 

 broad, apex acute, almost spiniform, distal joint short but distinct, an outer and an 

 inner spine on the basal joint from which the scale springs. 



Antennal peduncle extends only slightly iDeyond the distal end of the second 

 joint of the antennular peduncle. 



Tarsal joint of the thoracic limbs divided into four articulations in the third 



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