Chilton. — On New Zealand Sessile- eyed Crustacea. 257 



Genus Teraticum, novum. 



Body small. Eyes two. Coxae of first four segments as deep as their 

 respective segments. Antennae with short flagella ; upper antenna with a 

 small secondary appendage. Mandible with an appendage. First gnatho- 

 pod larger than the second, subchelate ; second slender, chelate. Posterior 

 pair of pleopoda uniramous. Telson single, undivided. 



I have been obliged to make a new genus for the reception of the 

 following species. In some respects it appears to resemble Kroyera, Spence 

 Bate ; but it is very distinct in others : — 



Teraticum typicum, sp. nov. PI. xviii., fig. 1, a to g. 



Antennas subequal, first joint of upper antenna equal in length to the 

 second, but stouter ; third about half as long as the second ; flagellum of 

 about four joints, only slightly longer than the second joint of peduncle ; 

 appendage very small and slender, of one long slender joint followed by 

 a very small short one. Peduncle of lower antenna with the second last 

 joint considerably longer than the last ; flagellum not so long as last joint 

 of peduncle. Peduncles of both antennae quite free from setse ; flagella 

 with a few short setae. First gnathopod large, carpus triangular, nearly as 

 broad at distal end as the propodos, propodos subquadrangular with an 

 oblique row of short setae near the centre of posterior margin, palm trans- 

 verse, the part near the base of dactylos crenated, hollowed in centre with 

 a small rounded projection in the centre of hollow ; dactylos strong, curved. 

 Second gnathopod slender, ischios long and slender, rather more than four 

 times as long as broad ; meros short ; carpus about two-thirds as long as 

 ischios, subtriangular ; propodos considerably longer than carpus, subrect- 

 angular, produced into a fixed finger against which the dactylos impinges ; 

 dactylos as long as fixed finger, and about one-third the length of the whole 

 propodos. First two pair of pereiopoda subequal, last three increasing in 

 size posteriorly, basa broad, that of fifth pair having the posterior margin 

 serrate, meros produced distally and posteriorly ; setae on pereiopoda few 

 and short. 



Fourth pleopod with rami longer than peduncle, inner slightly larger 

 than the outer, falciform ; fifth with peduncle longer than rami ; sixth with 

 peduncle short, the single ramus as broad as peduncle at first, but narrowing 

 distally. All the last three pairs of pleopoda without setae. Telson triangu- 

 lar, end rounded, margin entire, a very small seta on each side near the end. 



Length about ^ inch. 



Hab. Lyttelton Harbour. Three specimens only. 



Of the three specimens which I have seen, two had the first gnathopoda 

 as described and as drawn (pi. xviii., fig. 1, b and c); the third had the pro- 

 podos projecting distally, so that the gnathopod might almost be called 

 17 



