AUSTKALIAN MALACOSTKACA. 107 



Carapace strongly convex both in the transverse and the 

 antero-posterior direction ; surface very minutely granular, 

 lateral border arched anteriorly, with one tolerably deep incision. 

 Front strongly deflexed, its anterior border with a slight angular 

 mesial incision and a lateral shallow concavity, so as to appear 

 very obscurely four-lobed. Anterior legs (in the female) very 

 finely granulate ; fingers regularly toothed, a slight space between 

 them at the base. Length f inch ; breadth 1 inch. 



Shoalhaven. 



Grenus Helice, De Haan. 



Distinguished from Chasmarjnathus by having the s'ides 

 straighter, the front relatively narrower, the eye peduncles longer, 

 and the male abdomen narrower. 



195. Helice crassa. 



Helice crassa, Dana, U. S. Explor. Exped., Crust., p. 367, 

 pi. xxiii., fig. 8 (1852) ; Miers, Cat. Crust. K.Z., p. 43 (187(5). 



Carapace sub-quadrate, lateral margin with two emarginations 

 anteriorly, front half as long as breadth of carapace. Hand 

 short and broad (or high), above sub-carinate ; externally nearly 

 smooth, minutely granulate. Third joint of the following feet 

 sub-acute above. Pterygostomian region granulate, then pubes- 

 cent. Length | in. ; breadth f in. 



lllawarra (Dana). Found also in New Zealand. 



196. Helice Leachii. 



Helice Leachii, Hess, Archiv fur Naturg., Band xxxi., p. 153 

 (1865). 



Lateral border somewhat more arched than in the preceding 

 species. Surface of the hand finely punctate, the last abdominal 

 segment of the male almost triangular, the preceding segment 

 long trapeziform. \_Hess.~\ 



Sydney (Crottingen Museum). 



Genus Sesaema, Say. 



Carapace quadrate, often transversely lineolate, the lateral 

 margins toothed or entire. Front abruptly vertically deflexed, 



