187 



abdominal terga hardly overlap one another : the abdominal pleura behind the 

 1st are well developed : the telson is broadly truncated, and the caudal swim- 

 merets, which are broadly foliaceous, are of equal size. 



Two antennular flagella of moderate length much longer than the ped- 

 uncle. 



The antennal scale, when present, has the form of a spine : the antennal 

 peduncle is five-jointed and the flagellum lash-like. 



The manducant parts of all the maxillae and maxillipeds are normally deve- 

 loped. The external maxillipeds are pediform and seven- jointed. The maxilli- 

 peds and first 4 pairs of thoracic legs have foliaceous epipodites. 



The thoracic legs are 7-jointed, but there is h'ttle or no independent move- 

 ment between the basis and ischium. The first two pairs are chelate, the 1st 

 pair being very large and massive : the last three pairs are monodactylous. 



The abdominal appendages behind the 1st pair are biramous : those of the 

 1st pair in the male are slender and uniramous and are slightly modified for 

 copulation. 



The gill-elements are filaments of the trichobranchiate sort, but they often 

 are arranged on two sides of a stem, in phyllobranchiate fashion. 



In the Indian species from the deep sea it is common to find orifices, cor- 

 responding with the genital orifices of the male, in adult females. 



Synopsis of the genera of Axiidse of the Indian Benthos. 



I. The exopodite of the caudal swimmerets is not divided by a transverse 

 suture : at the distal end of the outer border of the 2nd joint of the 

 antannal peduncle are two spines of considerable size an outer " scapho- 

 cerite " and an inner " stylocerite " : pleurobranchiae are present on somites 

 xi. xii. xiii ... ... ... ... ... ... ICONAXIOPSIS. 



II. The exopodite of the caudal swimmerets is divided near its distal end by an 

 obliquely transverse suture : pleurobranchise absent : 



1. The " scaphocerite " and " stylocerite " of the antennal peduncle are 



conspicuous spines ... ... ... ... CALASTACDS. 



2. The " scaphocerite" and " stylocerite" of the antennal peduncle are 



minute points only visible with a lens ... ... ... CALOCAKIS. 



CALOCAEIS, Bell. 



Calocaris, Bell, Brit. Stalk-eyed Crust., p. 231 : Ortmann, Zool. Jahrb. VI, 1891, p 50. 



Carapace much shorter than the abdomen, compressed, deeply excavated 

 in the middle line posteriorly, the cervical groove distinct. Rostrum short, 

 triangular. 



