Plate XI. 



Figure 1. — Hi^yjjolyte polaris Ross ; anterior pleopod of the left side of a male, 39'4"'™ 



long, from the Gulf of Maine ; enlarged twelve diameters. 

 Figure 2. — Inner lamella of the left pleopod of the second pair of the same specimen ; 



enlarged the same amount. 

 Figure 3. — The same species ; anterior pleopod of the left side of a female, 45"^"" long, 



from near Cashe's Ledge, off the coast of Maine ; enlarged twelve diameters. 

 Figure 4. — Inner lamella of the left pleopod of the second pair of the same specimen ; 



enlarged the same amount. 

 Figure 5. — Sabinea septemcarinata Ross ; dorsal view of the carapax of a female from 



off Massachusetts Bay ; enlarged two diameters. 

 Figure 6. — Sabinea Sarsii Smith; dorsal view of the carapax of a female, 62™"" long, 



from the Lofoten Islands, Norway ; enlarged two diameters. Figure 6a, lateral view 



of the same. Figure Qb, dorsal view of the extremity of the abdomen of the same 



specimen, showing the right uropod and the telson ; enlarged three diameters. 



Figure 6c, tip of the telson of the same specimen ; enlarged twelve diameters. 

 Figure 1. — The same species; tip of the telson of a female, 3(!""" long, from the Gulf 



of Maine ; enlarged twelve diameters. 

 Figure 8. — The same species ; tip of the telson of a young specimen, only 1 6""" long, 



from St. George's Bank ; enlarged twenty -four diameters. 

 Figure 9. — Sabinea septemcarinata Ross ; dorsal view of the extremity of the abdomen 



of a female from off Massachusetts Bay, showing the appendages of the right side 



of the sixth segment and the telson ; enlarged three diameters. 

 Figure 10. — The same species; tip of the telson of an adult male, 40""" long, from off 



Massachusetts Bay, with what appears to be the normal arrangement of the terminal 



spines ; enlarged twelve diameters. 

 Figure 11. — The same species; tip of the telson of an adult female, about 60""" long, 



from off Massachusetts Bay, with the normal armament ; enlarged twelve diameters. 

 Figures 12 and 13. — The same species; tips of the telsons of two adult females from 



off Massachusetts Bay, with an apparently abnormal arrangement of terminal spines 



— in the second case evidently the result of injury ; enlarged twelve diameters. 



