96 A. Alcock — Carcinological Fauna of India. [No. 1, 



Subfamily III. Thiinse. Carapace subcircular the regions not 

 defined, antero-lateral borders entire or denticulate. Front entire, or 

 cut into two lobes which may again be subdivided into two lobules. 

 Buccal orifice moderately elongate, the external maxillipeds, which 

 completely cover the mouth, encroach somewhat on the very short 

 epistome. Basal antenna-joint fixed. 



Constituent genera : — 



1. Tliia, Leach: Milne Edwards, Hist. Nat. Crust. II. J43. 



2. *Kraussia, Dana. 



Subfamily IV. Atelecyclivse. Carapace subcircular, often a little 

 longer than bioad, the regions usually fairly or well defined, not much 

 areolated, antero-lateral borders us'ially with teeth. Front usually cut 

 into 3 (sometimes 2 or 4) teeth which are often prominent. Buccal 

 orifice elongate, not completely covered by the external maxillipeds 

 which are elongate — especially as to their merus — and overlap or com- 

 pletely conceal the sunken epistome. Basal antenna-joint either fixed 

 or slightly movable. 



Constituent genera : — 



1. * Atelecyclus, Milne Edwards, Hist. Nat. Crust. II. 141. 



2. Erimacrus, Benedict Proc. U. S. Nat. Mus. XV. 1892, p. 229 

 ( = Podacanthus, Brandt, Bull. Phys. Math. Acad. Petersb. VII. 1849, 

 p. 180). 



3. * J3i/29opeZ^amtw, Miers, Challenger Brachyura, p. 210 ( = PeZ^a- 

 rion, Lucas in Jacquinot's Voy. Astrolabe au Pol. Sud., Zool. III. Crust. 

 p. 80). 



4. PUosoma, Stimpson, Ann. Lye. Nat. Hist. New York, VII. 

 1862, p. 227. 



5. * Telmessus, White Ann. Mag. Nat. Hist. XVII. 1846, p. 497 

 and Samarang Crust, p. 14 ( = Platycorystes, Brandt, Bull. Phys. Math. 

 Acad. Petersb. VII. 1848, p. 179 : =GheiragonuSj Latr.). 



6. * Trachycarcinus, Faxon. 



7. * Trichopeltarium, A. Milne Edwards. 



Subfamily V. Acanthocyclinse, carapace subcircular. Front endihg 

 in a triangular point. Epistome short sunken, completely concealed by 

 the external maxillipeds which also completely cover the buccal orifice. 

 Antennal flagella absent. For the single genus 



Acanthocyclus, Milne Edwards and Lucas, Voy. Amer. Merid. Crust, 

 p. 29. 



[? Subfamily Trichiinse for Trichia De Haan, Faun. Japon. Crust, 

 p. 109, which may however be the type of a distinct family.] 



