226 



A. Alcock — Carcinological Fauna of India. 



No. 2, 



The abdomen consists of seven segments in the male, and of seven 

 in the female of all except D. muricata and hybrida. 



I. Pterygostomian 

 regions distinctly ■ 

 canaliculated fore ' 

 and aft. 



Key to the Indian species of Doclea. 



fl. Rostrum elongate — one-fourth to two- 

 fifths the length of the carapace proper, 

 and with the points very widely divari- 

 cated : the last lateral and the median 

 posterior spines of huge size D. tetraptera. 



fi. Two lateral spines 

 on the branchial 

 region : no medi- 

 an posterior 

 spine D. ovis. 



ii Three lateral 

 spines on the 

 branchial region, 

 the last being 

 short : a short me- 

 dian posterior 

 spine : no spines 

 on the dorsum of 

 the carapace D. japonica. 



. Rostrum short — 

 one-sixth the 

 length of the ca- 

 rapace proper — <{ 

 and with no mark- 

 ed divergence of 

 the tips. 



I 



i. Three lateral 

 spines on the 

 branchial region, 

 the last being, 

 like the postero- 

 median spine, 

 long : a line of tu- 

 fa e r c 1 e s , two of 

 which are usually 

 produced to form 

 spines, down the 

 middle of the 

 carapace ... D. canalifera. 



fl. Carapace discoid : 2nd pair of trnnk- 

 legs three to four times the length of 

 the carapace : a single series of tuber- 

 cles or spines down the middle of the 

 carapace D. gracilipes. 



2. Carapace globu- fi. Tubercles, not 



II. Pterygostomian 

 regions not canal- ■{ 

 iculated. 



lar : 2nd pair of 

 trunk-legs hardly 

 twice the length 

 of the carapace : 

 a short series of . 

 tubercles or spines 

 on either bran- 

 chial region paral- 

 lel to a long mid- 

 dorsal series of 



spines on the ca- 

 rapace D. 



■ Spines 

 bercles, 



not 



tu- 

 the 



l_ tubercles or spines I. carapace ,. D, muricata. 



