THE SESSILE BARNACLES. 351 



PLATE 46. 

 B alarms cariosus Pallas. Page 189. 



FIG. 1. Unalaska. Cat. No. 9226, U.S.N.M. Part of basal edge of lateral 



compartment and rostrum. 



2, 2a. Unalaska. Cat. No. 4S042, U.S.N.M. Lateral views of cylindric 

 specimens, the larger one deeply corroded. Natural size. 



3. Nazan Bay, Atka. Cat. No. 48045, U.S.N.M Young, natural size. 



4. Unalaska. Cat. No. 48043, U.S.N.M. Lateral view, natural size. 



Basal edge of same specimen shown in fig. 8. 



5. Neah Bay, Washington. Cat. No. 43044, U.S.N.M. Natural size. 



6. Unalaska. Cat. No. 9226, U.S.NM Colony of yoxing specimens on 



a clam shell Natural size. 



7. Nazan Bay, Atka. Cat. No. 48045, U.S.N.M. Immature stage, not 



corroded. Natural size. 



8. Unalaska. Cat. No. 48043, U.S.N.M. Part of the basal edge, of 



the rostrum. 



9. Sanborn Harbor, Shumagin Islands. Cat. No. 3r.ll, U.S.N.M. Two 



specimens which grew upon and in a sponge, part of which re- 

 mains on the right side, the rest removed to show the barnacles. 

 Natural size. 



PLATE 47. 



FIGS. 1-1 c. Balanvs cariosus (Pallas). Scutum and tergum of specimen from 

 Unalaska. Page 189. 



FIGS. 2-2(1. Balamis aeneas Lanchester. Scutum and terga of the type, and 

 tergum of a para type. Page 221. 



PLATE 48. 



FIGS. 1-10. Balamis liatniicnsis Pilsbry. Interior view of rostrum; interior 



and outside views of tergum and scutum ; an isolated individual, 



and two groups. All enlarged. Page 222. 



2-2e. Balanus tantilliis Pilsbry. Interior and exterior views of the 



opercular valves ; group on a sea-urchin spine, and more enlarged 



view of three individuals of the same group. Page 224. 



Figures le, If/, 2e X 2$ 



