352 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



Plate 49. 



Figs. l-ld. Balanus hesperius Pilsbry. Bering Sea, Albatross station 3483. 

 Cat. No. 32935, U.S.N.M. Type. Id, Scutum viewed from tiie 

 basal edge, tlie articular ridge projecting to the left. Page 193. 

 2. Port Townsend, Washington. Form Iwvidomus, ribbed in the 

 lower part, growing on Pecten caurinus. Greatest diameter 

 17 mm. Page 197. 



o, 3a. Albatross station 8675. Cat. No. 3293G. Form Uevidomtis, growing 

 on smooth shells of Natica, and varying from smooth to ribbed. 



4. Sitka, Alaska. Cat. No. 12418, U.S.N.M. Form Iwridumus on shell 



of Tegtila. 



5. Puget Sound. Cat. No. 48067, U.S.N.M. Form Iwvidomus, growing 



on shell of Thais. 



6. B. h. nipponensis, Japan, Albatross station 3768. Type-specimen, 



growing on shell of Natica. Page 199. 



7-7b. B. hcsijerius. Off Kamchatka. Alba.tross station 3780. Cat. No. 

 48066, U.S.N.M. Growing on egg capsules of Chrysodomus, 

 containing embryos. Page 193. 



8. B. hesperius. Alaska. Cat. No. 48065, U.S.N.M. Growing on an- 

 terior end of a Chrysodomus. Diameter 18 mm. Page 195. 



Plate 50. 



Balanus hesperius Pilsbry. Page 196. 



Figs. 1-1/. San Juan Island, Puget Sound. Form Icpvidoinus. Upper view, 

 opercular valves, rostrum (fig. Ic) and a carinolateral compart- 

 ment (fig. 1/). 

 2-2b. yl/^a^ross station 3096. Cat. No. 4S06S, U.S.N.M. Opercular valves 

 and lateral view, the latter from specimen 5.5 mm. in diameter. 



Plate 51. 



Fig. 1. Balanus flosculus Darwin. Chile. Cat. No. 48050, U.S.N.M. 

 Group on shell of Concholepas. Diameter of individual speci- 

 mens about 7 mm. Page 219. 

 la, Ic. Terga of specimens from the same group. 

 lb. Carina of specimens from the same group. 

 Id, le. If. Scuta of specimens from the same group. 

 2, 2a, 2b, Balanus krilgeri, variety. Off Kagoshima Gulf, Albatross station 

 4935. Cat. No. 48051, U.S.N.M. Two views of tergum and inside 

 of scutum. Page 214. 

 Plate 52. 



Figs. 1-1/. Balanus krugeri Pilsbry. Type. Opercular valves, lateral view of 

 walls, and two views of the carinolateral compartment. A small 

 portion of the basis adheres in fig. If. Page 214. 



2. Balanus hoekianus Pilsbry. Inside of rostrum of the type. 



Page 201. 

 2a, 2b. Top and lateral views of the wall. 

 2c-2/. Opercular valves. 

 Figs. 2-2/, reproduced from Bulletin of the Bureau of Fisheries. 



