346 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



PLATE 33. 

 Balanus balanus (Linnaeus). Page 149. 



FIGS. 1, la. Tablet bearing Linnseus's specimens, and profile view of the type- 

 specimen, from the collection of the Linuean Society of London. 

 2. Large English specimen of the typical form. Cat No. 12077, 



U.S.N.M. This individual grew on Pecten opercularis. 

 2a. Specimen growing on Pecten opercularis and showing its sculpture. 

 Cat. No. 12077, U.S.N.M. England. 



4. Strongly ribbed form, growing on a smooth mussel. Scarborough, 



England. 



5. Strongly ribbed form, growing on a smooth mussel. Belfast, 



Ireland. 



6, 6ff, 6ft. Opercular valves of the typical English specimen shown in fig. 2. 

 Gr. Tergum of specimen from Bering Sea, Albatross station 3289. See 

 also plate 35, fig. 4. 



PLATE 34. 



Balanus balanus (Linnfeus). Page 149. 



FIGS. 1-1 c. Bar Harbor, Maine, lateral view of specimen from a smooth shell, 

 with opercular valves. 



2. Portland, Maine. Cat. No. 4801G, U.S.N.M. Specimen showing 



normal development of carina and carinal latera, and broadly 

 spreading latera and rostrum. See also plate 35, fig. 6. 



3. Maine. Type-specimen of Balanus {icniculatus Conrad. Coll. 



A.N.S.P. Page 158. 



4. Fish Commission Station 134, off Thatchers Island. Rostral view 



of specimen growing on a smooth pebble. 



5. Georges Bank, in 40 fathoms. Cat. No. 3522, U.S.N.M. Specimens 



growing on Pecten magellanicus. 



6. Bar Harbor, Maine. Specimen growing on a small pebble, collected 



with fig. 1. 



7. Bay of Fundy. Cat. No. 2303, U.S.N.M. Group on a smooth 



pebble. 



Figs, lo-lc enlarged, the others reduced. 



