484 ME. G. M. THOMSON" ON 



increasing in size posteriorly, the first very small. Pleopoda 

 in the female small and narrow, very feebly developed; in 

 the male they are well-developed and two-branched ; in the first 

 pair the inner ramus is very small and one-jointed, the outer 

 of the usual natatory form ; the remaining pairs have both rami 

 long and subequal. Telson short, deeply cleft at the apex. 



Uropods narrow ; inner plate much shorter than outer, both 

 densely furnished with marginal setse. i\ uditory apparatus well- 

 developed. 



This genus appears to be intermediate between Leptomysis 

 and Seteromysis, resembling the former in general structure and 

 especially in the pleopoda and limbs. It differs from it, howevery 

 in the form of the front of the carapace, in the telson, and in a 

 less marked degree in having the antennary scale one-jointed, in- 

 stead of distinctly two-jointed. The resemblance to Heteromysis 

 lies particularly in the dilated second joint of the mandibular 

 palp. 



The genus is formed to contain a species which is not un- 

 common on the coasts of New Zealand. 



TeNAGOMTSIS NOViE-ZEALANDIiE, u. sp. (PI. 33. figs 6-8 ; 

 PI. 34. figs 9-17.) 



Porm of the body linear, tapering slightly to the telson; 

 length about six times the greatest breadth. 



Dorsal shield short, obtusely pointed in front in the median 

 line ; evenly rounded on the posterior margin, only slightly pro- 

 duced backwards on the lateral portions. 



l^yes large, cornea hemispherical, peduncles short and stout. 



Peduncle of the superior antennae with the basal joint subequal 

 in length with the 2nd and 3rd together ; the appendage iu the 

 male is produced into a rounded process, furnished with a dense 

 bunch of hairs at its base ; inner flagellum less than half as long 

 as the outer, very slender, destitute of hairs, and rather densely 

 pigmented in great portion of its length (figs. 6 & 7). 



Scale of the inferior antennae obliquely lanceolate, more than 

 twice as long as the peduncle, maximum width about one fifth of 

 the length, densely furnished with plumose sette, which are very 

 long on the curved inner margin ; both the scale and the 

 peduncle of the antennse are more or less ornamented with black 

 stellate or frondose markings (fig. 8). 



Maxillcs of the first pair are normal. The second pair of 



