31 



331 



Pinnotheres bürgeri Rathbun. 



Pinnotheres bürgeri. Rathbun. Proc. Biol. Soc. Washington XXII, 109, 1909. 



Near P. gracilis, having similar maxillipeds 

 and legs, but differing in the carapace, eyes and 

 chelipeds. Carapace of female nearly as long as wide 

 (about 2 mm. in each dimension), nearly circular, 

 the front a little advanced, the orbits cut out of 

 the margin and the eyes, therefore, visible from 

 above; eyes unpigniented. 



The chelipeds differ from those of P. gracilis, 

 in having the lower margin of the propodus con- 

 cave below the distal end of the palm and the 

 fingers tapering more regularly to the strongly 

 curved tips; a slight basal prominence is present on 

 each finger. 



South of Koh Kut, 17—20 fath., mud; I. 28; 1 ? 

 juv. Koh Kram, 30 fath.; III. 2 or 21; 1 ? juv. type. 



Fig. 12. Pinnotheres bürgeri. 



type 9, - mm. wide: a, dorsal view; 



b, maxilliped. 



Pinnotheres parvulus Stimpson. 



Plate II, fig. 9. 



Pinnotheres parvulus Ortmann, Zool. Jahrb., Syst., VII, 699, pi. XXIII, fig. 12, 1894; Stimpson, Smith- 

 son. Misc. Coll., XLIX, 142, 1907. Not P. parvulus de Man, Jour. Linn. Soc. London, XXII, 

 105, 1887, and Arch. f. Naturg., LIII, pt. 1, 383, 1887; Bürger, ZooL Jahrb., Syst., VIII, ;176, 

 pi. IX, fig. 18, pi. X, fig. 17, 1895; and Alcock, Jour. Asiat. Soc. Bengal, LXIX, 339, 1900, which 

 may be known as Pinnotheres alcocki, Rathbun (Proc. Biol. Soc. Washington, XXII, 114, 1909). 



Allowing for the variations probable in a 

 species of Pinnotheres, it is very unlikely that the 

 dactylus of the endognath of P. parvulus presents 

 the different aspects ascribed to it. It is defined 

 by Stimpson as "slender, reaching to the end of 

 the penult joint" ; and it is so represented by 

 Ortmann; but de Man, Bürger and Alcock describe 

 the dactylus as distinctly falling short of the end 

 of the propodus. 



The single specimen which I refer to P. par- 

 vulus agrees with Stimpson's all too brief descrip- 

 tion, excepting as regards size and locality. The 

 length of the type female is. 14 inch or 3-5 mm., 

 while the Siamese specimen is 75 mm. long and 

 85 mm. wide. The type locality is a sandy bottom 

 Fifi.v.i. Pinnotheres parvulus, Lem Ngob.g, in 26 fathoms, in the China Sea, while the example 

 8 5 mm. wide: a, chela; b, legs. in hand is from a mangrove swamp at Lem Ngob. 



