188 |  Transactions.— Zoology. 
Art. XV.—On two new Isopods. By CmagLEs Cututon, M.A. 
[Read before the Philosophical Institute of Canterbury, 6th April, 1882.] 
Plate XXIIa. 
Genus Cymodocea, Leach. 
(Generic characters given in Miers’ Catalogue N.Z. Crustacea, p. 113.) 
Cymodocea cordiforaminalis, sp. nov. Pl. XXII., fig. 1. | 
Bopv rather convex, slightly more than twice as long as broad. Head 
much broader than long, eyes rather large. Segments of thorax smooth, 
or only minutely granular, coxæ of all densely covered with rather long, 
very fine, woolly sete. First segment rather longer than the others, next 
five equal in length, last longer, produced backwards at its postero-inferior 
margin, posterior margin slightly convex, overlapping the abdomen. Ab- 
domen of two segments; the first showing on each side impressed lines 
indicating that it is composed of three or perhaps of four segments, having 
an irregular row of small rounded tubercles, posterior margin straight in 
the centre, produced backwards on each side into the last segment. Last 
segment very convex, bearing on the convex part several round tubercles of 
various sizes, the largest being near the median line and in the anterior 
part of the segment. The two lateral portions on each side of the terminal 
notch produced backwards and inwards, so as to meet in the median line, 
the central tooth small and sharply-pointed, so that what is really the ter- 
minal notch appears as a heart-shaped opening in the end of the abdomen. 
Last pair of pleopoda with the rami equal, reaching very slightly beyond 
the end of the abdomen. Inner ramus with its inner edge entire, outer 
margin at first entire but distally curved and irregularly toothed and fringed 
with sete. Outer ramus thickest about the middle, proximal portions of 
margin entire, distal portions dentate, more distinctly so at the extremity, 
and fringed with sete. 
Inner antenna with first joint of peduncle very stout, second also stout, 
third as long as the first but slender, being about four times as long as 
broad; flagellum shorter than the peduncle, of about 9-10 joints, bearing 
simple auditory cilia. Outer antenna with peduncle of five joints, first 
three subequal, fourth a little longer, fifth nearly twice as long as the 
fourth, narrow at proximal end but widening distally; flagellum longer than 
peduncle, of about 15 joints, each bearing a small tuft of short sete. First 
pair of legs with basos and ischios long, the latter bearing on its outer 
distal margin four or five short stout sete, meros broader than long, 
carpus small, propodos ovate with sete on inner edge, some being plumose, 
dactylos large and strong, the end forming a claw distinct from the basal 
portion. 
