Crustacea Decapoda and Stomatopoda. 
287 
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 by 
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 on the infero-external aspect of the second segment of the anbenaal 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. 
I Kingsley, Bull. Essex Inst., XX VII, p. 98, pi. iii, figs. 1-7 (1897). 
* 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 are as follows : — 
Dorsal teeth. 
6 specimens have 10 teeth. 
4 ., II 
12 
13 
14 
IS 
I specimen has 16 
I ,, 17 
Ventral teeth. 
I specimen has no tooth. 
I I „ 
7 specimens have 2 teeth. 
17 „ 3 
16 ,, ,,4 
8 M .1 5 
6 In fifty specimens from the Tai Hu in China the numbers of teeth are as follows : 
Dorsal teeth. 
Ventral teeth. 
I specimen has 
12 teeth. 
2 
specimens have 
2 teeth. 
3 specimens 
have 
13 
5 
3 
2 ,, 
14 
13 
4 
7 
15 >> 
12 
5 
6 
16 ,, 
9 
, » ♦ » 
6 ,, 
8 
17 
5 
7 
7 
18 ,, 
3 
8 ,, 
6 
19 ,, 
I 
specimen has 
9 •, 
3 
20 ,, 
I specimen 
has 
21 ,, 
4 specimens have 
22 ,, 
I specimen 
has 
23 
26 „ 
