568 MR. W. V. LANCHESTER ON THE [Dec. 3, 



fingers are longer than the pahn, in the other tlie fingers are 

 shorter and the hand less compressed. 



79. PAiiiEMON SFNDAicus Heller. 



Palcemon sundaicus, Heller, SB. Ak. AV^iss. Wien, xlv. 1, p. 415 

 (1862); Ortmann, Zool. Jahrb. Syst. v. p. 719 (1891); de Man, 

 Weber's Zool. Ergebn. p. 437, pi. xxvi. fig. 35 (1892). 



Loc. Biver Patalong. 



A male and a female with ova. Length, S 24*5 mm., $ 28 mm. 



The 2nd legs are quite smooth, without any signs of teeth even 

 at the base of the fingers. 



80. Paljemon lampbopus de Man. 



Palcemon lampropus, de Man, Weber's Zool. Ergebn. p. 493, 

 pi. xxix. fig. 49 (1892). 



Loc. Aring, Kelantan. 



A large female with ova ; length 63 mm. 



A male, length 38 mm. ; and a male, length 28 mm. 



Some slight differences may be noted between these specimens 

 and the species as described {t. c. supra). The rostrum in the 

 female has 13 teeth only above, 5 below ; in the larger male 12 

 only above, 4 below ; in the smaller male it is broken off at the 

 9th, but the 1st tooth is seen to be a little separate from the 

 rest. Moreover, while in the female the rostrum conforms to 

 Dr. de Man's description in regard to its length, in the larger 

 male it reaches quite as far as the scaphocerites, and considerably 

 beyond the peduncle of the 1st antennae. 



Of the legs, the 1st pair shows this difference, that the carpal 

 joint is quite twice as long, or even a little more than twice as 

 long, as the hand. Only the larger chelipede of the larger male 

 is present, and in this 1 note that the carpus equals the merus in 

 length, and bears, in addition to the spinules on the upper and 

 lower borders, a few similar spinules on its outer surface. There 

 is also considerable grooving of the carpus and hand in this 

 instance, but this, I have no doubt from its appearance, is due to 

 mechanical compression only. The under edges of the carpi of 

 the last 3 legs are armed with 10-12 spinules, of unequal size, 

 and somewhat widely separate. 



81. Pal^mon paucidens, sp. n. (Plate XXXIII. fig. 4.) 



Of. Palcemon idee (Heller), de Man, Zool. Jahrb. Syst. ix. p. 767 

 (1897) ; and P. cf . idee (Heller), Ortmann, Semon's Porschungs- 

 reise, v. i. p. 18 (1894). 



Loc. Singora ; numerous individuals of both sexes. 



This species is a small form, allied to P. idee ITeller by the 

 relative shortness and the slightly raised upper margin of the 

 rostrum, by the greater length of the carpus of the 2nd pair 

 relatively to the merus and chela, and the shortness of the fingers 

 relatively to the palm. 



The rostrum, however, bears fewer teeth above, and the actual 



