282 Memoirs of the Indian Museum. [Vol. V, 



of the telson (terminal spines included). The outer and inner uropods are equal in 

 length, the former being about two and a fifth times as long as broad. The telson 

 bears two pairs of dorso-lateral spinules and is not sulcate above ; the apex (text-fig. 

 2ji) is sharply acute and is furnished with three pairs of spines , those of the inter- 

 mediate pair twice, or more than twice, the length of the inner and several times 

 longer than the outer. 



Eyed eggs borne by females are about 058 mm. by o - 44 mm. in longer and 

 shorter diameters. 



Large specimens from the Chilka Lake do not exceed 21 mm. in total length : 

 individuals from the Madras backwaters are frequently larger, up to .25 mm. in length. 



The presence of supra -orbital and hepatic spines and the long and slender carpus 

 of the second peraeopods, outstanding characters of P. demani, are shared by six 

 described representatives of the genus ; namely — 



Periclimenes aesopius (Bate). 



1863. Anchistia aesopia, Bate, Proc. Zool. Soc, London, p. 502, pi. xli, fig. 5. 



Periclimenes danae (Stimpson), Borradaile. 



1898. Periclimenes danae, Borradaile, Proc. Zool. Soc, London, p. 1004, pi. lxiii, figs. 4, 4a, b. 



Periclimenes edwardsi (Paulson). 



1875. Anchistia edwardsii, Paulson, Crust, of the Red Sea, p. 114, pi. xvii, figs. 2, 2a, b. 

 1906. Anchistia edwardsi, Nobili, Ann. Sei. nat., Paris, (9), iv, p. 53. 



Periclimenes elegans (Paulson). 



1875. Anchistia elegans, Paulson, ibid., p. 113, pi. xvii, figs. 1, la-h. 

 1906. Anchistia elegans, Nobili, ibid., p. 52. 



Periclimenes ensifrons (Dana) [=P. vitiensis, Borradaile and ? P. grandis (Stimpson)]. 

 1852. Anchistia ensifrons, Dana, U.S. Explor. Exped., Crust., I, p. 578, pi. xxxvii, figs. $a-l. 

 1902. Periclimenes ensifrons, de Man, Abhandl. naturf. Ges. Frankfurt, XXV, p. 826. 



Periclimenes tenuipes (Holmes nee Borradaile). 1 



1900. Anchistia tenuipes, Holmes, Occas. Papers California Acad. Sei., VII, p. 216. 



1910 Periclimenes tenuipes, Rathbun, Harriman Alaska Exped., X, Crust., p. 34, text-fig. 12. 



P. aesopius is readily distinguished from P. demani by the form of the third 

 abdominal somite which is " postero-dorsally carinated and elevated into a hump- 

 like tooth." From all the other species listed above P. demani may be distinguished 



1 I am unable to understand Nobili's statement {Ann. Mus. Zool. Napoli, II, 1907, No. 21, p. 5) 

 that Heller regarded Palaemon biunguiculatus as a synonym of " Periclimenes tenuipes, Leach." Heller 

 in 1857 (Crust, südlich. Europ., p. 256) cites P. unguiculatus as a synonym of Anchistia scripta; but 

 there is no reference to any species of Leach and I am unable to discover that that author ever des- 

 cribed a Palaemonid under the name of Periclimenes tenuipes. If this is so, tenuipes may legitimately 

 be used for the Californian species described by Holmes, while P. borradailei, Rathbun (1904) should be 

 employed for P. tenuipes, Borradaile. Nobili (Bull. sei. France Belg., XL, 1906, p. 42) has suggested 

 the name brevinaris for the form which he described in the preceding year (Bull. Mus. d'Hist. Nat., 

 Paris, 1905, p. 159) as P. borradailei. 



