J'J.ATE XXIII. 



Phreatoicus i'<ijicnsix, n. sp. 



Whole animal enlarged nearly 5 times ; n.s. natural size. The pleopods in 

 their natural position do not project beyond the pleura, as shown in the 

 figure. 



a. 1. Upper antenna, with tip further enlarged. 



a. 2. Lower antenna. 



l.s. Upper lip. 



l.i. Lower lip. 



1 inand. Left mandible from within, the t\vu cutting-edges further enlarged. 



mx. 1. First maxilla, apices of the lobes further enlarged, and one of the dentate 

 spines from the outer lobe. 



mx. '2. Second maxilla. 



nixp. Maxilliped. 



c? . prp. 1. Left first peraeopod of male, with palm and linger further enlarged. 

 ? , prp. 1. Left first peraeopod of female, with spines from the palm enlarged. 



prp. '2. Left second peraeopod. 



