288 ZOOLOGY OF THE FAR EAST. 



The specimens recorded by Miss Rathbun from Fusan in Korea, with 14 to 18 

 teeth on the upper margin of the rostrum and 4 to 6 on the lower margin, most pro- 

 bably belong to the subspecies sinensis, and this is almost certainly true of Doflein's 

 specimens from Pekin with 14 to 16 dorsal teeth and 3 to 5 ventral. In the figure 

 given by the latter author the deeply excavate anterior margin of the carpus of 

 the first legs is clearly shown. 



In both races the rostrum reaches almost to, or a little beyond, the apex of the 

 antennular peduncle. Its upper border is dorsally concave with the distal quarter or 

 third of its length unarmed. Two or three of the posterior dorsal teeth are situated 

 on the carapace behind the level of the orbit. The preorbital length of the antennular 

 peduncle is about seven-tenths the post-orbital length of the carapace. 



Fig II. — Caridina denticulata (de Haan). 

 a, h. Typical form. c, d. Subsp. sinensis, nov. 



a, c. Anterior part of animal in lateral view. 

 h, d. Fir.st peraeopod. 



The merus of the third peraeopods bears 3, very rarely 4 teeth on its lower border ; 

 the dactylus bears 7 to 10 spines in Japanese specimens, 8 to 13 in those from China. 

 The merus of the last pair of peraeopods also has 3 teeth on its lower edge ; the propo- 

 dus is from 2|- to 2f times the length of the dactylus. The latter segment is about 4 

 times as long as broad ; it bears about 40 to 60 teeth in Japanese specimens and about 

 50 to 70 in those from China. The number of movable spines on the outer uropod 

 varies from 10 to 16. 



Large specimens reach a length of about 28 mm. ; none are ovigerous. 



According to notes made by Dr. Annandale on Japanese specimens the species in 

 life varies considerably in colour, as a rule it was brownish with mottled and marbled ( 



