THE SESSILE BARNACLES. 349 



PLATE 40. 

 Balanus crenatus Bruguiere. Page 1G5. 



FIG. 1. Newfoundland Bank, in 35 fathoms. Albatross station 2443. Cat. 

 No. 48029, U.S.N.M. Characteristic group, growing on shell of 

 Buccinum. 



2. Newfoundland Bank, 39 fathoms. Albatross station 2449. Soli- 



tary columnar form. Cat. No. 48030, U.S.N.M. 



3. Sable Island, Nova Scotia. Growing on bark. Cat. No. 48031, 



U.S.N.M. 



4, 4a. Inglefield Gulf, Greenland., Cat. No. 24911, U.S.N.M. Lateral com- 

 partment and interior view of rostrum. 



5, 5ff, 56. Newfoundland Bank. Cat. No. 4S032, U.S.N.M. Flaring and bell- 

 shaped solitary specimens, one having the lateral compartments 

 removed on one side to show the strong sutural ridges in the 

 cavity. 



G. Fishing banks. Cat. No. 9215, U.S.N.M. Growing on the shell of 

 Cyrtodaria, which also supports a coral (gift of Gloucester 

 fisherman). 



All figures except 4 and 4 are natural size. 



PLATE 41. 



FIG. 1. Balanus crenatus curviscutum Filsbry. Unalaska. Cat. No. 9201, 

 U.S.N.M. Interior of tergum, showing narrow spur. See fig. 4. 



Page 175. 



2-26. Balanus crenat us Bruguiere. Tacoma, Washington. Cat. No. 48033, 



U.S.N.M. Nearly smooth specimen on a smooth pebble. Page 171. 



3, 3a. Balanus crenatus Bruguiere. Bering Sea. Albatross station 2462. 



Cat. No. 48034, U.S.N.M. ' Ribbed form, on gastropod. Page 171. 



4. B. c. curviscutum Pilsbry. Unalaska. Cat. No. 9201, U.S.N.M. 



Entire individual and bases of four others, on Mytttus eclulis. 

 See also fig. 1. Page 175. 



5. B. crenatus Bruguiere. Alaska. Cat. No. 48035, U.S.N.M. 



Page 171. 



G-Ge. B. crenatus Bruguiere. Alaska. Albatross station 851. Cat. No. 

 48036, U.S.N.M. Smooth cylindric or liliaceous forms, with 

 wide radii when crowded; more conic, with narrow radii when 

 growing alone (tig. 6). Page 172. 



PLATE 42. 



FIGS. 1-16. Balanus crenatus curviscutum Pilsbry. Bristol Bay, Alaska. Cat. 

 No. 48037, U.S.N.M. Fig. 1 is 11.5 mm. high. Page 175. 



2-2d. B. c. curviscutum. Albatross station 3232, Bristol Bay, Alaska. 

 Cat. No. 32948, U.S.N.M. Crowded, cylindric form. Fig. 2c rep- 

 resents specimen 20 mm. long. Page 175. 

 3-36. Balanus crenatus delicatus Pilsbry. Humbolt Bar, California. Cat. 

 No. 48039, U.S.N.M. Altitude of fig. 3, 13.25 mm. Page 177. 



