THE SESSILE BARNACLES. 353 



PLATE 53. 



Balanus hameri (Ascanius). Page 205 



FIG. 1-lrf. Off Nova Scotia, 82 fathoms, U. S. F. C. loc. 41, 1877. Cat. No. 

 9044, U.S.N.M. Opercular valves and lateral view of a large 

 specimen. Length of rostrum, 74 mm. 



2. Albatross station 2057. Cat. No. 48049, U.S.N.M. Basis of speci- 



men growing on Pccten magellanicus. 



3. Albatross station 2251. Cat. No. 9163, U.S.N.M. Group on Buc- 



cinuni undatum, natural size. 



PLATE 54. 



Balanus evermanni Pilsbry. Page 210. 



FIG. 1. Terguni of a specimen from the Kuril Islands. 

 2-2c. Scutum and tergum of the type-specimen. Junction of Clarence 



Strait and Behm Canal, Alaska. Cat. No. 41840, U.S.N.M. 

 3-3e. Carina, 3b; lateral, 3, 3d: carinolateral, 3c; rostrum, 3a, 3e of 



a paratype. Half natural size. 



PLATE 55. 



FIGS. 1-lra". Balanus dcclivis Darwin, Bermuda. Cat. No. 48052, U.S.N.M. 

 Lateral view and opercular valves. Page 230. 



2-2d. Balanus orcutti Pilsbry. Type. Lower California. Cat. No. 1783, 

 A.N.S.P. Lateral and carinal views, and opercular valves. 



Page 233. 



PLATE 56. 



FIGS. 1-lc. Balanus galeatns (Linnseus). South Carolina. Cat. No. 48047, 



U.S.N.M. Page 236. 



Id. B. galeatus. South Carolina. Cat. No. 48046, U.S.N.M. Length 



of right-hand specimen 19.5 mm. Page 236. 



2-2d. Balanus scandens Pilsbry. Japan. Type. Cat. No. 48048, U.S.N.M. 



Lateral view and opercular valves, all much enlarged. Page 239. 



PLATE 57. 



Acasta cyathus Darwin. Page 244. 



FIGS. 1, la, 1&. Near Colon, Albatross station 2146. Cat. No. 7842, U.S.N.M. 

 2, 2a, 2b, 2c. West Florida. 



3. Near the Dry Tortugas, Albatross station 2414. 



PLATE 58. 



* 



FIG. 1. Tetraclita squamosa japonica Pilsbry. Wakanoura, Kishiu. Cat. 

 No. 48053, US.N.M. Page 252. 



2, 2a. T. s. japonica. Japan. Cat. No. 48054, U.S.N.M. Page 252. 



3, 3a. T. s. japonica. Ayukawa, Japan. Cat. No. 48060, U.S.N.M. Opercu- 

 lar valves of the type. Page 252. 



4. Tetraclita rosea Krauss. Page 260. 

 5, 5a, 5b. Tetraclita squamosa rufotincta Pilsbry. Aden. Cat. No. 48055, 



U.S.N.M. Opercular valves and group. Type. Page 253. 



6, 6a. T. s. rufotincta. Prison Island, Zanzibar. Opercular valves. 



