Species of Maioid Crustacea. 7 



joints truncated at their distal ends, against which the ter- 

 minal joints are retractile. In the postabdomen the sutures 

 of all the joints are clearly distinguishable. 



Hob. ? 



Perhaps, when the examination of specimens in good con- 

 dition shall have determined the structure of the orbits and 

 antennas of this remarkable form, it will be found necessary 

 to remove it to the Periceridas. For the present I retain it in 

 the neighbourhood of Huenia, to which it is allied in many 

 respects. The form of the rostrum alone suffices to distin- 

 guish it from all its allies. 



Maiidae. 

 Chorilibinia gracilipes, sp. n. (PI. IV. fig. 4.) 



Carapace subpyriform, smooth, and spinose above, the spines 

 disposed as follows : — four in the middle line, of which two 

 are on the gastric, one longer on the cardiac, and one strong 

 curved spine upon the posterior margin. There are two strong 

 spines upon the branchial regions above; and below them, 

 immediately above the bases of the ambulatory legs, are four 

 small blunt spines. The posterior margin of the carapace is 

 produced and forms a thin edge. Below, upon the pterygo- 

 stomian region, is a rather strong spine ; and there is a blunt 

 spine at the antero-lateral angles of the buccal cavity. The 

 rostrum is prominent, the spines coalescent at base and diver- 

 gent in their distal half. The upper orbital margin is promi- 

 nent and divided by a narrow fissure ; and there is a wider 

 fissure below. The anterior legs are small, slender, smooth, 

 palm slightly compressed, and fingers straight and acute. The 

 ambulatory legs are long and very slender, and are clothed 

 with distant tufts of small curled hairs. The first ambulatory 

 legs in particular are very greatly elongated, and with the 

 terminal joints very long and slender. The postabdominal 

 segments (in the male) are all distinct. Length of carapace 

 to base of rostrum, in the larger specimen, nearly i inch. 



Hab. Papua (H.M. S. c Herald ; ' the locality may be 

 doubtful) . 



Two male individuals are in the collection of this very 

 interesting species. I assign it to the genus Chorilibinia of 

 Lockington without much hesitation, although the generic 

 diagnosis and specific description of his species (C. angusta) 

 from California leaves much to be desired in point of com- 

 pleteness. The structure of the rostrum and orbits is the same ; 

 and the basal antennal joint bears a long spine on its outer 

 margin. The inferior surface of the body is densely pubes- 



