214 



BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



from Bering Sea and the Kuril Islands (Simushir) the radii of the 

 lateral compartments are narrower, and the spur of the tergum is 

 longer, about one-fourth the total length of the valve, which is 

 slightly narrower (pi. 54, fig. 1; p. 211, fig. 676). 



The specimens from Bering Sea do not reach the length of those 

 from southern Alaska. One of the largest, from station 3602 is 

 105 mm. in height, 61 mm. rostrocarinal diameter. Another, from 

 station 3487, has a height of 53 mm., diameter 45 mm. These differ- 

 ences apparently indicate incipient racial differentiation of the 

 northern forms (fig. 67a). 



The 3^oungest individual seen, from station 3487, has a diameter 

 of 10 mm., height 7 mm. It is almost as wide at the aperture as at 

 the base, and there are no radii; alee very wide. This is unlike B. 

 hameri, which is somewhat contracted above at this size, and has 

 well-deA^eloped radii. In evermanni of 13 mm. diameter the radii 

 appear as extremely narrow borders. In those of 20 to 25 mm. they 

 are still very narrow. Thus, a rostrum 25 mm. long, 15 mm. wide, 

 has radii only 1.5 mm. wide in the widest place. 



BALANUS KRUGERI, new species. 

 Plate 52, figs, l-l/; pi. 51, figs. 2, 2a, 26. 



Type. Cut. No. 38700, U.S.N.M., from Albatross station 3707, 

 near Ose-Zaki, in the upper part of Suruga Gulf, Japan, 63-75 

 fathoms; surface temperature 65 F. Seated on a branch of coral. 



Distribution. Japan, Suruga Gulf to Kagoshima, 63-103 fathoms. 



A barnacle with thin solid walls, the base calcareous, without pores, 

 and flat. Orifice rather large, deeply toothed. Exterior nearly 

 smooth, the parietes marked with faint growth lines and weak, un- 

 evenly developed longitudinal striee. White, under a thin, pale-yel- 

 low epidermis, -covering both parietes and radii. 



Rostrocarinal diameter, 13 mm. ; height, 15 mm. 



