348 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



Plate 37. 



Figs. l-l-^. Balanus rostratus apertus Pilsbry. Opercular valves of the type. 



Page 144. 



2-2c. Balanus amphUrite peruvianus I'ilsbry. Opercular valves of the 



type. Page 97. 



Figs. 1-lc 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 3S. 



Figs. 1-16. Balanus rostratus dalli Pilsbry. IJnalaska. Cat. No. 9202, U.S.N.M. 

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



Page 147. 

 lo, 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. 48024, U.S.N.IM. Grow- 

 ing on B. r. dalli, Cat. No. 48023, U.S.N.M. Page 1.59. 

 8. Balanus rostratus suturaUs Pilsbry. Alaska. Cat. No. 48025, 

 U.S.N.M. Page 148. 

 4, 4a. Balanus rostratus alaskensis Pilsbi-y. 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 1G5. 



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

 2, 2a, 25, 2c. Gay Head, Massachusetts. On Mytilus eduUs, growing on an iron 

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



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



Cat. No. 48028, 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. 



