Crustacea Decapoda and Stomatopoda. 



J87 



is produced to form a tooth in C. pasadenae, Kingsley,' from California and C. 

 davidi, Bouvier - from China. A similar tooth is frequently to be found in Indian 

 specimens of a form closely allied to C. weberi, subsp. sumatrensis ; but it is here vari- 

 able in its development and in some localities at least does not even possess racial 

 significance.'^ 



Classified according to the scheme outlined by Bouvier* in 1913, C. denticu- 

 lata would find a place alongside the Chinese C. davidi, Bouvier. Balss regards 

 the latter species as synonymous with the former, but in this he is certainly in error. 

 C. davidi, co-types of which are in the Indian Museum, differs in many respects from 

 C. denticulata and may be distinguished at a glance by the depressed rostrum and bj^ 

 the strong curvature of the propodi of the last three pairs of legs. 



The Japanese and Chinese races of C. denticulata may be distinguished in the 

 following manner : — 



Typical form. 



Japan. 



Rostrum usually with 10 to 15 teeth above 



and with 2 to 5 below ^ (text-fig. iia). 



Anterior margin of carpus of first peraeo- 



pod slightly excavate (text-fig. 116). 



subsp. sinensis, nov. 



China. 



Rostrum usually with 14 to 22 teeth above 



and with 3 to 8 below.*^ (text-fig. iic). 

 Anterior margin of carpus of first peraeo- 

 pod deeply excavate (text-fig. iid). 



the latter to a projection ou the infero-exteraal aspect of the second segment of the aubeanal peduncle (cf. description of 

 C. brevirostris , p. 452). He makes no mention of a tooth or spine at the antero-inferior angle of the carapace. 



1 Kingsley, Bull. Essex Inst., XXVII, p. 98, pi. iii, figs. 1-7 (1897). 



2 Bouvier, Bull. Sci. France Belgique, XXXIX, p. 83, fig. 7. 



3 Vide Kemp, Rec. Ind. Mus., XIV, p. 100 {1918). 



* Bouvier, Trans. Linn. Soc. Zool. (2), XV, p. 462 (1913). 



6 In fifty specimens from the neighbourhood of Lake Biwa in Japan the numbers of rostral teeth ate as follows : — 



Dorsal teeth. 

 6 specimens have 10 teeth. 



I specimen has 



Ventral teeth. 

 I specimen has no tooth. 

 I ,, ,, I „ 



7 specimens have 2 teeth. 



6 In fifty specimens from the Tai Hu in China the numbers of teeth are as follows :- 



Dorsal teeth. 

 I specimen has : 2 teeth. 

 3 specimens have 13 ,, 

 14 ,. 



19 



I specimen has 21 

 4 specimens have 22 

 I specimen has 23 

 ' ., ,, 26 



Ventral teeth. 

 2 specimens have 2 teeth. 



5 



13 

 12 ,, 



9 

 5 

 3 

 I specimen has 9 



