GENEEA UEOTHOB AND UEOTHOIDES. 29 



PLATE II. 



Urothoe marinus. 

 The full figure is given in lateral view, with a line above it indicating the natural size. 

 a.s. Upper antenna. 



a.i. Lower antenna ; only a part of the flagellum drawn. 

 m.m. The pair of mandibles. 

 rax. 1. First maxilla. 

 mx. 2. Second maxilla. 

 mxp. One half of the maxillipeds, and on a larger scale the inner and outer 



plates of the other half. 

 gn. 1. First gnathnpod. 

 gn. 2. Second gnathopod. 

 prp. 1, 2, 3, 4, 5. The first, second, third, fourth, and fifth peraeopods respectively ; the 

 figure prp. 3 to the left showing the outer side, and the figure 

 prp. 3 to the right showing the inner side of the limb. 

 pip, sp. Coupling-spines and a cleft spine of the pleopods. 

 ur. 1, 2, 3. First, second, and third uropods respectively. 

 T. Telson. 



PLATE III. 



Urothoe brevicornis. 



The full figure is given in lateral view from a small specimen, the line above 

 it to the right indicating the natural size, the line above it to the left showing the 

 length of a female specimen. The figures of the separate parts were all taken from 

 the male. 



a.s. Upper antenna. mx. 1. First maxilla. 



a.i. Lower antenna. gn. 1. First gnathopod. 



m. Left mandible. gn. 2. Second gnathopod. 



l.i. Lower lip. 

 prp. 1, 2, 3, 4, 5. First, second, third, fourth, and fifth peraeopods respectively, both 

 sides of the third perseopod being shown. 

 Fl.s. 2, Pl.s. 3. The lower portions respectively of the second and third segments of 

 the pleon. 

 ur. 1, 2, 3. First, second, and third urqpods respectively. 

 T. Telson. 



