PLATE IV. 



Fig. 17. Alpheus Icpidus de Man. Small chelipcd of the larger female, looked at from the inner side, 



X 17 (the leg is lying somewhat obliquely, so that the merus and the chela appear a trifle 

 less broad). 



Fig. 18 — \%b. Alpheus cucliinis Dana. Ova-bearing female from the north coast of Sumatra. — iS Frontal 

 and antennal region, X B; \%a the same looked at laterally, X 8; \'6b peraeopod of the 

 3'''l pair, )< 6. 



Fig. 19 — 19/. Froccssa aequimana (Paulson). All the figures are taken from the specimen, long 14,7 mm., 

 which is supposed to be a male, excepting 19c which is the telson of an egg-bearing female. — 

 19 rostrum, eye-peduncles etc., viewed from above, X 33; I9'« rostrum etc., viewed from 

 above, X 50, a peduncle of the right eye; \()b lateral view of rostrum, X 50 ; \(jc telson 

 of the female, X 50 (here the distance between the anterior pair of spinules and the base 

 measures only one-si.xth the length of the telson); 19^/ right, \(^c left leg of i^t pair, X 50; 

 19/ carpus and chela of the right leg of 2'>d pair, X 50. 



Fig. 20— 20(^. Enoploinetopits longirostris de Man. — 20 2nd pleopod, X 50 ; 20a extremity of stylamblys 

 of this pleopod, X 320 ; 20b stylamblys of 3'-d pleopod, X 50. 



