CarLton.—On New Zealand Sessile-eyed Orustacea. 257 
Genus Teraticum, novum. 
Body small. Eyes two. Coxe of first four segments as deep as their 
respective segments. Antenne 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. Pl. xviii., fig. 1, a to g. 
Antenne 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 pedunele ; 
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 antenna quite free from sete; flagella 
with a few short sete. First gnathopod large, carpus triangular, nearly as 
broad at distal end as the propodos, propodos subquadrangular with an 
oblique row of short sete near the centre of posterior margin, palm trans- 
verse, the part near the base of dactylos erenated, 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 ; sete 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 sete. Telson triangu- 
lar, end rounded, margin entire, a very small seta on each side near the end. 
Length about 7 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 (pl. xviii., fig. 1, b and c); the third had the pro- 
podos projecting distally, so that the gnathopod might almost be called 
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