Carcinoid] ical Fauna of India. lil 



II. Extromo length of the carapace about two- 

 thirds of its extreme breadth : free mar- 

 gin of clypeiform expansions strongly 

 laciniatc : — 



1. Carapace, in the adult, nearly smooth: 



clypeiform expansions well-developed. 

 [Inhabitants of shallow water] : — 

 i. Anterior border of eudostomial sep- 

 tum deeply concave : no spine in 

 the middle line, on the posterior 

 border ... ... ... 0. lophos. 



ii. Anterior border of endostomial sep- 

 tum strongly convex : a spine in 

 the middle line, on the posterior 

 border ... ... ... 0. philargius. 



2. Carapace, in the adult, more or less 



covered with pustular tubercles : clyp- 

 eiform expansions little developed. 

 [Habitat deep water] ... ... C. exanthematosa. 



III. Extreme length of the carapace very much 

 less than two-thirds of its extreme 

 breadth : free margin of clypeiform ex- 

 pansions either smooth throughout, or 

 broadly dentate : — 



1. Extreme length of carapace rather more 



than half its extreme breadth : surface 

 of carapace with numerous sharpish 

 tubercles : antero-lateral border of clyp- 

 eiform expansions with broad teeth 

 the points of which are cither acute 

 or have the form of up-curved spines: — 

 i. Antero-lateral border of carapace 



coarsely serrate ... ... C. hepatica. 



ii. Antero-lateral border of carapace, 

 and of clypeiform expansions, with 

 strongly up-curved spines ... G. spinosissima. 



2. Extreme length of carapace rather less 



than half its extreme breadth : surface 

 of carapace with wavy beaded lines 

 only : free edge of clypeiform expan- 

 sions smoothly moulded and entire ... C. fornicata. 



1 1<; 



