197 

 Family Calliaiiassiclce, Bate. 



Spence Bate, Challenger Crust. Macrura, p. 27 : Stebbing, Hist. Crust., p. 183 : Ortmann in Bronn's Thier 

 Reich (Malacostraca), p. 1142. 



Carapace short, not overlapping the 1st abdominal tergnm; rostrum short, 

 triangular, or rudimentary. The last thoracic somite is movable and the last 

 thoracic sternum separate. The abdominal terga, which are more or less un- 

 equal in size, hardly overlap one another, and the pleura are rudimentary or 

 absent. [The telson is usually subquadrate and the caudal swimmerets usually 

 foliaceous] . 



Two antennular flagella of no great length. The antennal peduncle is 

 five-jointed and the flagellum lashlike : no antennal scale. 



The external maxillipeds are either pediform or sub-operculiform. 



The thoracic legs are 7-jointed, but there is no independent movement 

 between the basis and ischium. The 1st or 1st and 2nd pairs may be chelate, 

 or the 1st pair may be subchelate and the 2nd pair may be monodactylous : the 

 3rd and 4th pairs are monodactylous, but the 5th pair may be subchelate or 

 even imperfectly chelate. 



[In all the Indian deep-sea species the 1st pair of abdominal appendages 

 are slender uniramous filaments, the gill-elements are phyllobranchia?, epipodites 

 are absent behind the 1st maxillipeds, and podobranchise and pleurobranchire 

 are absent]. 



Synopsis of the genera of Callianassidas of the Indian Benthos. 



I. Carapace less than half the length of the abdomen, rostrum small or rudi- 

 mentary : external maxillipeds broadly pediform, without an exopodite : 

 first 2 pairs of thoracic legs chelate ... ... ... ... Callianassa. 



II. Carapace more than half the length of the abdomen, rostrum of fair size : 

 external maxillipeds slenderly pediform, with a slender exopodite : first 2 

 pairs of thoracic legs non-chelate ... ... ... ... Gebicula. 



Callianassa, Leach. 



Callianassa, Leach, Edinburgh Encyclopaedia, Art. Crustaceology VII., p. 400 (apud Stebbing), and Malac. 

 Pod. Brit. : Milne Edwards, Hist. Nat. Crust. II. 307 : Heller, Crust. Siidl. Europ., p. 201 : A. Milne Edwards, 

 Nouv. Archiv. du Mus. VI. 1870, p. 75 : Spence Bate, Challenger Crust. Macrura, p. 28 : Stebbing, South African 

 Crust., p. 38. 



Carapace very short, less than half the length of the abdomen, the posterior 

 border concave, the linese thalassinicee (or longitudinal sutures that mark the 

 fusion between the median and lateral elements of the carapace) very distinct. 

 Rostrum short, triangular, or rudimentary. 



Abdomen long, the terga, which are very unequal in length and breadth, 

 not overlapping one another; the pleura small, or rudimentary, or absent. In 



