348 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



PLATE 37. 



FIGS. l-lA Balanus rostratiis apertus Pilsbry. Opercular valves of the type. 



Page 144. 



2-2c. Balanus amphitrite peruvianus Pilsbry. Opercular valves of the 



type. Page 97. 



Figs. 1-le reproduced from the Bulletin of the Bureau of Fisheries. Figs. 2-2c 



from the Proceedings of the United States National Museum. Drawn by 



Helen Winchester. 



PLATE 38. 



FIGS. 1-lb. Balanus rostratiis dalli Pilsbry. Unalaska. Cat. No. 9202, U.S.N.M. 

 Type. Lateral view, basis and basal edge of the rostrum. 



Page 147. 

 Ic, portion of rostrum filed to show parietal tubes. 



2. B. r. dalli. Unalaska. Cat. No. 48023, U.S.N.M. 



2a. Balanus balanus L. Unalaska. Cat. No. 4S024, U.S.N.M. Grow- 

 ing on B. r. dalli. Cat. No. 48023, U.S.N.M. Page 159. 



3. Balanus restrains suturalis Pilsbry. Alaska. Cat. No. 48025, 

 . U.S.N.M. Page 148. 



4, 4a. Balanus rostratiis alaskcnsis Pilsbry. Kodiak. Cat. No. 34515, 



U.S.N.M. Lateral view and scutum. Page 141. 



5. Balanus rostratus alaskensis Pilsbry. Cape Douglas, Alaska. 



Cat. No. 48026, U.S.N.M. Basal edge of the rostrum. Page 141. 



PLATE 39. 



Balanus crenatus Bruguiere. Page 165. 



FIG. 1. Estuary of the Exe River, England. Group on a potsherd. 

 2, 2a, 2b, 2c. Gay Head, Massachusetts. On Mytilus edulis, growing on an iron 



buoy. Cat. No. 48027, U.S.N.M. 

 3. Vineyard Sound, Massachusetts. Tergum of a tubular specimen. 



Cat. No. 4S028, U.S.N.M. 

 4, 4a. Davis Strait, Greenland. Scutum and tergum. 



5. Vineyard Sound, Massachusetts. Cat. No. 48028, U.S.N.M. Group 

 of the tubular form growing on a pebble. 



