Plate XII. 



Figure 1 . — Meterythrops rohtusta Smith ; dorsal view of the front part of a male, 1 B'"™ 

 long, from the GuK of St. Lawrence ; enlarged six diameters. Figure lo, one of 

 the anterior plcopods of the same specimen ; enlarged twelve diameters. 



Figure 2. — The same species ; antennal scale of a female. 1 6'5""" long, from the Gulf 

 of St. Lawrence ; enlarged twenty-four diameters ; the marginal plumose setas 

 omitted. Figure 2a, dorsal view of the lamellas of the uropod of the left side of 

 the same specimen; enlarged fifteen diameters. Figure 2&, a part of the inner 

 margin of the inner lamella, more highly magnified to show the marginal spines and 

 the bases of the plumose seta;. Figure 2c, telson of the same specimen; enlarged 

 thirty diameters. Figure 2d, tip of the same telson, more magnified. 



Figure 3. — Pseudomma truncatum Smith ; dorsal view of the antenna of an adult 

 male ; enlarged thirty diameters. Figure 3a, outline of the opthalmic segment of 

 the same specimen ; enlarged thirty diameters. Figure 36, tip of the telson of the 

 same specimen ; enlarged thirty diameters ; the cilia of the median setfe omitted. 



Figure 4. — The same species ; telson of an adult female ; enlarged thirty diameters ; 

 the cilia of the median terminal setae omitted. 



