106 STALK- AND SESSILE-EYED CRUSTACEA 
four thoracic segments large. Terminal segment of the abdomen 
large, almost semicircular in outline, rather broader than long, with a 
faintly marked raised longitudinal median line. Caudal appendages 
slender, projecting slightly beyond the posterior margin of the abdo- 
men, outer rather the longest. Antenne slender. Femoral joints of 
of the ambulatory legs scarcely enlarged. Length % in. 
New Zealand (Coll. Brit. Mus.). 
This species is distinguished by the form and markings of the 
terminal segment of the abdomen, A single specimen, probably young, 
is in the Collection of the British Museum. It ought perhaps to be 
referred to the genus Cymothoa, as the front is slightly inflexed, and 
conceals the bases of the slender antenne, but it has not the deeply 
encased head, and the greatly enlarged femoral joints of the legs of 
the species of that genus. 
LIRONECA. 
Lironeca, Leach, Dict. Sci. Nat. xii, p. 551, (1818) ; M. Edw. Hist, 
Nat. Crust. iti, p. 259, (1840); Dana, U.S. Explor. Exped. xiv. Crust. 
part ui, p. 747, (1853). 
Body oval, rather flattened, and often obliquely distorted. Head 
small, front narrow, slightly involuted. Segments of the abdomen very 
short ; penultimate segment about as wide as the last segment of the 
thorax. Epimere not greatly produced backward. Femora of moderate 
width, never greatly dilated, expanded and thickened as in Cymothoa. 
Caudal appendages short. 
118. Lironeca novee-zealandie. PI. III, fig. 2. 
Cymothoa novee-zealandie, List Crust. Brit. Mus. p. 110, (1847), 
sine descr. ; Miers, Ann. Mag. Nat. Hist. (ser. 4) xvii, p. 227, (1876). 
Moderately convex. Head small, about as long as broad, widest in 
the middle, with the sides converging to the back and front, deeply 
encased within the first segment of the body. The seven segments of 
the thorax of nearly equal width, shghtly roughened on the sides, each 
with a faintly marked groove, produce for a short distance inwards, 
and obliquely forwards from the lateral margin. Segments of the 
abdomen (the last excepted), very narrow ; last segment transverse, 
surface uniformly and faintly wrinkled, posterior margin with a nearly 
semicircular outline, entire. Caudal appendages very small, outer 
ramus slightly the larger. Colour dark brown, Length 14 in, 
New Zealand (Coll, Brit. Mus.). 
