I9I7-] S. Kemp : Notes on Crustacea Decapoda. 215 



stegal spine there is a finely cut groove, resembling a suture line, 

 which extends from the anterior margin backwards for about one 

 third the length of the carapace. 



The greatest breadth of the cornea is about equal to the 

 length of the eyestalk. A small ocellus (not found in either of the 

 two preceding species) is visible, partly joined to the cornea (text- 

 fig. 5). 



The basal segment of the antennular peduncle bears a small 

 spine on the lower surface near the middle of its internal margin. 

 The outer border, in front of the short spine representing the 

 lateral process, is sinuous and terminates in a tooth which extends 

 but little beyond the level of the protruding, setose antero-exter- 

 nal margin of the segment The second segment, measured mid- 

 dorsally, is a little more than half the length of the third. The 

 total length of the shorter branch of the outer antennular flagellum 

 is about equal to that of the peduncle ; sometimes it is a little longer, 

 sometimes shorter. The length of the fused portion is variable, 

 even on the two sides of the same specimen; it consists of some 

 8 to 12 segments and is as a rule decidedly shorter than the last 

 peduncular segment. 



The antennal scale differs considerably from that of the two 

 preceding species. It is broader, scarcely three times as long as 

 wide, and the rather sharply rounded distal end of the lamella 

 extends much further beyond the spine that terminates the outer 

 margin. 



The oral appendages do not differ in any noteworthy degree 

 from those of L. senatus, Pennant. The mandibular palp is com- 

 posed of three segments, the ultimate almost twice the length of 

 the penultimate. The third maxillipedes reach about to the end 

 of the antennal peduncle ; the antepenultimate segment is less ex- 

 panded distally than in L. tenuipes and the exopod reaches to its 

 anterior quarter ; the last segment is about two thirds the length 

 of that which precedes it. 



The first peraeopods reach almost or quite to the end of the 

 antennal scale. The merus and carpus are about equal ; the chela 

 is barely three fifths the length of the carpus and the fingers are 

 onl}' a trifle longer than the palm. 



The second peraeopods vary considerably in length. In large 

 specimens of both sexes they may extend beyond the tip of the 

 scale by the whole of the chela, carpus and a small portion of the 

 merus ; in others, also fully adult, they reach beyond the same 

 point only by the length of the chela, in others again only by a 

 small fraction of the finger-length. The proportions of the seg- 

 ments in ten large individuals are shown in the table on p. 216. 



It will be noticed that the ischium, merus, carpus and palm 

 decrease successively in length in nearly all cases, but that in 

 very large males the carpus is sometimes equal to, or a little longer 

 than the merus. The fingers are either a Httle shorter than, equal 

 to, or longer than the ischium ; the carpus in all cases is very 



