143 

 Family Stenopidw, Spence Bate. 



Spence Bate, Challenger Crust. Macrura, p. 206 : Stebbing, Hist. Crust., p. 211 : Ortmann, in Bronn's Thier- 

 Reich, Malacoatraca, p. 1134. 



Carapace of no great length, body not compressed. Rostrum of no great 

 length, compressed. The pleura of the 2nd abdominal somite do not overlap 

 those of the first. 



No distinct antennular scale (stylocerite). Antennal scale well developed. 



The mandible has an incurved 3-jointed palp, and its incisor and molar 

 processes are separated merely by a groove. 



The coxa and basis of the 1st and 2nd maxilla? and 1st maxillipeds are well 

 developed, the coxa of the 2nd maxilla? not receding and being deeply cleft 

 transversely into two (unequal) lobes. 



The terminal joint of the 2nd maxillipeds is a distinct dactylus articulating 

 end on with the distal end of the propodite. 



External maxillipeds long pediform. 



The first three pairs of thoracic legs are chelate, the third pair being the 

 longest and stoutest. No exopodites on any of the thoracic legs. 



Key to the genera of Stenopida? of the Indian Benthos. 



I. The exopodite of the external maxillipeds is well developed : the carpus of 

 the 3rd pair of thoracic legs is of good length : — 



1. Eyes present : dactylus of 4th and 5th thoracic legs simple and 



of good length ... ... ... ... Engystenopus. 



2. Eyes obsolete : dactylus of 4th and 5th thoracic legs short and 



bifid ... ... ... ... ... RlCHARDINA. 



II. The exopodite of the external maxillipeds is a mere rudiment : the carpus 



of the 3rd pair of thoracic legs is short and trigonal ... ... Spongicola. 



Engystenopus, Alcock and Anderson. 



Engystenopus, Alcock and Anderson, Journ. Asiatic Soc. Bengal, Vol. LXIII. pt. 2, 1894, p. 149. 



Body smooth, not compressed. Rostrum short, laterally compressed. 

 Telson dorsally spinose, blunt and rounded off, about as long as the caudal 

 swimmerets, the outer of which has no transverse fissure. 



Eyestalks short, eyes small. Antennular peduncle short, with the basal 

 joint dorsally concave : two longish stiffish antennular flagella. Antennal scale 

 large. 



Mandible with incurved 3-jointed palp. All three pairs of maxillipeds with 

 well developed flagelliform exopodites. 



First 3 pairs of thoracic legs chelate, increasing in length in posterior 

 succession : the first 2 pairs slender ; the 3rd pair stouter, but still of slender 



