442 MR. J. R. HENDERSON — A CONTRIBUTION 



they are normal in other respects, I am forced to regard them as belonging to a variety 

 in which the apical growth of the rostrum has heen arrested. 



I refer to the P. Lamarrei, of Milne-Edwards, described from Bengal, certain specimens 

 from Ganjain, in which the rostrum exceeds the antennal scales by about half its length, 

 and is upturned distally, with six or more teeth below, and the upper teeth most marked 

 proximally, in which the telson is narrow and acute, with the subterminal spinules at 

 some distance from the apex. These were taken with typical examples of P. carcinus, 

 and I regard them as being merely the young of this species. De Man and Ortmann 

 regard P. Lamarrei as identical with a species found in Brazil ; but it seems to me 

 improbable that, in a freshwater genus apparently so plastic as Talcemon, the same 

 species should "occur in such widely separate localities. 



Distribution. India, Burmah, Siam, Malay Peninsula, and the Malay Archipelago 

 (Sumatra, Java, Borneo, Philippines, Celebes, New Guinea). 



263. Pal^emon dispar, von Martens. 



P. dispar (v. Mart.), Ortmann, Zool. Jalirb. Bd. v. Abth. f. Syst. p. 718 (1891), ubi synon. ; De Man, 

 Max Weber's Crust, p. 427, Taf. xxvi. fig. 34 (1891). 



Calcutta, several specimens (Bay). 



I refer these with some hesitation to this species. The rostrum is almost straight, 

 reaching the end of the antennal peduncles, and in some specimens even the end of the 

 antennal scales, with from nine to thirteen teeth above, and four or more, rarely five, 

 below, the first two upper teeth separated by a wider interval than the others, and 

 the third placed above the orbital margin. The carapace is slightly scabrous. The 

 chelipedes are very long, slender, and unequal, with the surface scabrous ; the carpus 

 exceeds the palm by half its length, and the fingers are about half the length of the 

 palm. Both fingers in the male have a row of tubercles on the inner margin, while in 

 the female there is simply a sharp edge. The telson is rather broad towards the apex, 

 but pointed, with the inner subterminal spinules more than twice the length of the 

 outer ones, or of the apical spine of the telson ; the terminal setae are slightly longer 

 than the inner spinules. The largest specimen is 73 mm. long, not including the 

 rostrum, and the larger chelipede 145 mm. long. 



Distribution. Reunion, Mauritius, Rodriguez, Malay Archipelago (Adonara, Timor, 

 Mores, Saleyer, Celebes, Amboina), Samoa. 



204. Pal^mon scabriculus, Heller. 



P. scabriculus, Heller, 'Novara' Crust, p. 117, Taf. x. fig. 9 (1865) ; Ortmann, Zool. Jahrb. Bd. v. 

 Abtb. f. Syst. p. 710 (1891) ; De Man, Max Weber's Crust, p. 462, Taf. xxvii. fig. 41 (1891). 



Kotri, on the River Indus, several specimens (Brit. Mm.). 



The rostrum is deep, and scarcely reaches the end of the antennal scales ; the teeth are 



more erect than usual, and in number ^— , the fourth or fifth upper tooth placed above 



the orbital margin. The carapace is scabriculate anteriorly and on the branchial areas, 

 but punctate behind. The chelipedes in the male are about equal in length to the body, 



