South African Crustacea. 39 



the sixth pleon segment in this form is simple, without division 

 into two, whether teeth or tubercles. 



By depending on a minute system of comparative measurements 

 one might perhaps in this genus found several species upon 

 specimens very closely connected in their actual origin. 



A specimen 79 mm. long was procured at a depth between 750 

 and 800 fathoms, Cape Point N.E. by B. f E. 38^ miles ; bottom, 

 green mud. At the same locality, but in a different haul, a specimen 

 measuring (with tip of rostrum broken) 92 mm. was obtained, 

 this being a female with eggs, very much more bulky than the 

 preceding. At a neighbouring station, Cape Point N. 77 E., 

 depth 660 to 700 fathoms, bottom green mud, a similar female 

 specimen was obtained, measuring 107 mm. in length. Lastly, 

 a quite slender specimen, 74 mm. long, was obtained on similar 

 ground, between 720 and 800 fathoms, Cape Point by D.R. N.E. 

 f E. 40 miles. 



Practically all the specimens, both those assigned to G. sculptus 

 and those to G. longirostris, were obtained in the same vicinity, on 

 ground of one character, and at considerable depths. Professor 

 Smith describes a female of G. sculptus 108 mm. long, and the 

 same sex of G. longirostris 107 mm. in length. Should one of the 

 species have to be cancelled, it is the latter that must fall, since 

 G. sculptus has page precedence. 



FAMILY 



1905. Palcemonidce, Coutiere, Ann. Sci. Nat. Zool., Ser. 8, vol. xii., 



p. 249 



In his treatise here cited, on " Les PalaemonidaB des eaux douces 

 de Madagascar," Professor Coutiere supplies a long bibliography 

 of this family from de Haan in 1836 down to the year 1900. 



GEN. MACROTEROCHEIR, nom. nov. 

 1891. Palamon (Macrobrachium), Ortmann, Zool. Jahrb., vol. v., 



pp. 696, 733. 

 1897. Macrobrachium (sub-gen.), Ortmann, Revista do Museu 



Paulista, N. 2, p. 199. 

 1905. Palamon (Macrobrachium}, Coutiere, Ann. Sci. Nat., Ser. 8, 



vol. xii., pp. 252, 267, 273, 287. 



Spence Bate, in the Challenger Macrura, p. 788, 1888, reduces 

 to a synonym of Bithynis, Philippi, the genus which, in 1868 (Proc. 



