85 



maxilla?) short, unsegmented. Petaloid exopodites are present on all the 

 thoracic legs. 



Epipodites absent from the 3rd maxillipeds as well as from the last three 

 thoracic appendages; sometimes absent from a/? the legs. No pleurobranchiae 

 on the last two thoracic somites. 



Andricum symmetrical. The 3rd maxilhpeds and 5th pair of legs are not 

 known to be modified in the male. 



The branchial formula is : — 



Total 



ep. 



ep + 



(ep.) + 

 (ep.14- 



.3 

 3 

 3 

 3 

 3 

 1 

 



Total 



ep. 



11 ( + r?) 



ep. 



The vestigial arthrobranch of somite VII is often absent. 



+ 16 (+r?) 



Key to the Indian species of the genus Parapeneopsis. 



I. Epipodites on 2nd maxillipeds and first two pairs of chelipeds : the usual 

 isolated epigastric tooth of the rostral carina present : — 



1. Outer antennular flagellum as long as the carapace (without ros- 



trum) : the subhepatic ridge defining the anterior part of the 

 cervical groove is continued to the tip of the branchiostegal 

 tooth : telson with strong lateral marginal spines ... ... P. styUfera. 



2. The subhepatic ridge does not run on to the branchiostegal tooth : 



only rarely does the telson have an obscure lateral marginal 



spine : — 



i. Outer antennular flagellum as long as its peduncle ... P. sctdpHlis. 



ii. Antennular flagella shorter than the peduncle : — 



a. Postrostral carina continued to posterior border of 



carapace : — 



a. Carina canaliculate : spine on basis of 2nd 



pair of chelipeds indistinguishable ... P. tmcta. 



(3. Carina sharp : spine on basis of 2nd pair 

 of chelipeds very strong: in females 

 there is also a spine on the basis of the ^V'H'' 



3rd pair of chelipeds ... ... P. maxillipedo. 



b. The postrostral carina fades away far in advance of 



the posterior border of the cai-apace : antennular 

 flageUa about a third the length of the peduncle... P. nana. 

 II. Epipodites present on the 2nd maxillipeds only: no postrostral carina and 



no isolated epigastric spine ... ... ... ... P. acdivirostns . 







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