P OF NEW ZEALAND. 49 
darker colour. Nevertheless, this species, if correctly drawn, differs 
from all Cra flattened, and-expanded ambulatory 
legs, and I hayeseen no specimens resembling it. 
Sub-Family II. Hymenicina. 
Hymenicine, Dana, U.S. Explor. Exped. xiii, Crust. part i, p. 378, 
(1852). 
Body very much depressed, sub-orbicular, or sub-triangular, slightly 
produced, often rostrate, anteriorly. Second joint of the external 
maxillipeds more than half the length of the third joint. 
HALICARCINUS. 
Halicarcinus, White, Ann. Mag. Nat. Hist. xviii, p. 178, (1846). 
Carapace generally broader than long, the edge of the strongly 
depressed upper surface with two teeth or angles on each side, Jront 
tridentate, internal antenne visible between the frontal lobes. Four 
last pairs of legs cylindrical, and free from hairs, claws considerably 
curved and compressed. Abdomen of male six-joimted, concave on 
each side, about the middle. Outer mawillipeds, as in Hymenosoma, 
covered on the outside with short hairs. 
The abdomen of the male is concave, not “deeply notched” on each 
side as stated in White’s description. 
54. Halicarcinus planatus. 
Cancer planatus, Fabr. Ent. Syst. i, p. 446, (1793). 
Leucosia planata, Fabr. Ent. Syst. Suppl. p. 350, (1798). 
Hymenosoma Leachii, Guerin, Icon. pl. x, fig. 2, Voy. Coquille ii, 
p- 22, (1828). 
? Hymenosoma tridentatum, Jacquinot and Lucas, Voy. Pole Sud 
Zool, iii, p. 60, pl. v, fig. 27, (1853). 
Halicarcinus planatus, White, Ann. Mag, Nat. Hist. xvii, p. 178, 
pl. ui, fig. 1, (1846). 
Halicarcinus ovatus, Stimpson, Proc. Acad, Nat. Sci, Philad. p. 109, 
(1858). 
Carapace quite flat above, with a transverse groove separating the 
gastric from the cardiac regions, and a longitudinal groove on each 
side of these regions. Antero-lateral margins with two small acute 
E 
