Cuirrox.—On new Isopods. 189 
Colour—dark brown, usually with a white median streak on the anterior 
part of the thorax. 
Length, about $ of an inch. 
Hab. Lyttelton Harbour. 
This species can be readily recognized by the peculiar character of the 
terminal notch of the abdomen. This appears, however, to be subject to 
some variation, for in one small specimen the median tooth was represented 
only by a very small rounded projection, and in another of the ordinary size 
the two lateral portions of the abdomen did not quite meet in the median line. 
Genus Jaera, Leach. 
(Bate’s and Westwood’s Brit. Sessile-eyed Crust., ii., p. 314.) 
** Upper antenna very short. Lower antenna more than half the length 
of the animal. Legs uniform slender. Pleon coalesced into one segment, 
furnished with two minute subterminal uropoda. Pleopoda or branchial 
appendages covered by a large plate occupying the entire under surface of 
the pleon. Dactyla E 
Jaera nova-zealandie, sp. n 
Body narrow elliptical, pp about two and a half times the greatest 
breadth. Head subrectangular, slightly more than twice as broad as long, 
produced into a slight median lobe between the antenne. Eyes small, 
situated near the middle of the lateral margins. Inner antenna reaching 
to the third joint of the outer antenna, no flagellum distinguishable, basal 
joint very much larger and broader than any of the others, second and fifth 
joints equal and longer than the third and fourth, which are equal to one 
another, sixth (terminal) joint small, sete: few and short. Peduncle of outer 
antenna of five joints, first two equal and longer than the third, fourth and 
fifth equal and longer than any of the others, flagellum a little longer than 
the peduncle. Legs equal, all with propodos slender and longer than 
carpus, dactylos short ending in three curved hooks. Segments of thorax 
with short stout sete on the lateral margins. Pleon nearly circular, lateral 
margins with short set», slightly emarginate at the base of the last pair of 
pleopoda. These are lateral, being situated at some distance from one 
another ; they are short, each consisting of a short peduncle bearing two 
branches, inner one about as long as the peduncle and nearly twice as long 
as the outer branch, both tipped with short sets. 
Length, about 41; of an inch. 
Hab. Lyttelton Harbour. 
This species resembles Janira and Asellus, and differs from Jaera in 
having the two terminal pleopoda separated from one another and not 
elosely approximated in the centre as in Jaera ; in other respects, however, 
it agrees well with Jaera. 
