178 Mr. A. White on some new genera of Crustacea. 



which precedes it hollowed on the fore side, the edges of the 

 hollowed part strongly ciliated, the tarsus widened at the base 

 *nd ciliated ; fourth pair of legs the longest, the tarsus flattened, 

 sides parallel and ciliated, tibial joint somewhat elongated, cylin- 

 drical ; fifth pair of legs with the tarsus flattened and somewhat 

 bent, the tibial joint short. 



First pair of legs of the female very small, hands linear, ciliated ; 

 second pair much as in male, but not so robust, the tibial joint 

 not so rough on the outside ; third pair simple ; fourth and fifth 

 pairs much as in male. 



Xenophthalmus pinnotheroideSj White. PL II. fig. 2. Side of 

 carapace in front with the sharp edge ciliated; carapace punctured; 

 two slight waved longitudinal grooves, one extending from each 

 eye over the back of the carapace ; most of the joints of the legs 

 ciliated. 



Hab. Philippine Islands. British Museum. From the col- 

 lection of Mr. Cuming. The figure is of the size of nature. 



Family Myctirid^e. 



Halicarcinus, White. A subgenus distinguished from Hy- 

 menosoma of authors [Leachium, MacLeay) by the great size of 

 the thickened fore-feet, by the carapace being generally wider 

 than long, and having the edge of the strongly depressed upper 

 surface with two teeth or angles on each side. The four last pairs 

 of legs are cylindrical and free from hairs, while the claws are 

 considerably curved and compressed. The tail of the male is 6- 

 jointed and deeply notched on each side about the middle. The 

 outer pedipalps, as in Hymenosoma, are covered on the outside 

 with short hairs. 



This subgenus seems in its family a kind of representative of 

 the Leucosiadce : the type was regarded by Fabricius as a Leu- 

 cosia. 



Halicarcinus planatus, PI. II. f. 1. Leucosia planata, Fabr. Ent. 

 Syst. Suppl. 350. Hymenosoma Leachii, Guerin, Icon. 1. 10. f. 2 ; 

 Voy. de la Coquille, ii. p. 22. Hymenosoma tridentatum, Hombr. 

 and Jacq. Voyage au Pole Sud, t. 5. f. 27. 



This species seems to be abundant in and about the Falkland 

 Islands. In the British Museum are specimens obtained there 

 byW. E.Wright, Esq., and the Antarctic Expedition under Capt. 

 Sir James Clarke Boss, R.N. 



Halicarcinus depressus. Hymenosoma depressum, Hombr. and 

 Jacq. Voyage au Pole Sud, t. 5. f. 34. 



This species, of which there is a specimen in the collection of 

 the British Museum from New Zealand, connects Halicarcinus 

 and Hymenosoma, having most of the characters of the former. 



