lis 



TAR.TARIDES. 



Suborder TARTARIDES* 



Tartarides, 0. P. Cambridge, A. M. N. H. (4) x, p. 410, 1872. 



Cephalothorax covered above by two plates — a posterior, smaller, 

 wider than long, representing the dorsal elements of the 5th and 

 6th somites, which bear the 3rd and 4th pairs of legs ; and an 

 anterior, much longer than wide, representing the dorsal elements 

 of the anterior four somites. Eyes sometimes absent, at most re- 

 presented by a single pale spot or ocellus on each side. Chelae or 

 palpi sub-prehensile, sub-pediform, not chelate, folding in a vertical 

 plane ; 4th segment (tibia) without spiniform apophysis, 5th seg- 

 ment long, cylindrical ; 6th segment (tarsus) shorter, conical, armed 



A. 



B. 



Fig. 37. — Schi-omns crassicaudatus. 



A. Lower side of cephalothorax and abdomen. «, coxa of chela ; h, of first 



leg; c, of second leg; d, of third leg; e, of fourth leg; /, presternum ; 

 ff, metasternum ; //, first sternum, i, last sternum of abdomen; /.-, caudal 

 sclerite. 



B. Carapace and anterior end of abdomen, m, anterior plate of carapace; 



n, posterior plate; /, rostrum; o, first, p, second terguru of abdomen. 



C. Posterior end of abdomen. 



witli a pair of spiniform processes ; claw long, not fused to tarsus. 

 Legs-, 2nd with its tarsus 8-segmented, 2nd segment very long, 

 more than half the length of the succeeding six; coxa of 2nd leg 

 armed in front with a long spiniform process; femur of 1th leg 

 very thick; 6th segment (protarsus) of 2ml, 3rd, and 1th legs 

 subequal to the 5th (tibia) or at all events not much shorter. 

 Abdomen with its postanal sclerite short and uusegniented. .No 

 distinct pulmonary apertures behind the 1st and 2nd sterna. 



* Propofed us a family-name by Cambridge, and elevated to the rank of a 

 • tribe by Tl orell I Ann. Mas. Genova. xwi, p. 358 ■ 



