76 
BULLETIN OE THE BUREAU OF FISHERIES. 
Balanus evermanni Pilsbry. 
1907. Balanus evermanni Pilsbry, Bulletin of the Bureau of Fisheries, vol. xxvi, p. 203. 
In 1906 this fine barnacle was taken at the following stations: Station 4792, near Bering Island, 
in 72 fathoms, museum no. 38661 ; stations 4803 and 4804, off Cape Rollin, Simushir I., Kuril Islands, 
in 229 fathoms, museum no. 38658, 38659, 38660, 38662. It has apparently a general distribution 
from Alaska to the Kuril Islands. 
The specimens agree in essential features with those originally described, but show some varia- 
tion in the shape of the cup, such as is to be expected in any lengthened acorn barnacle. In a few 
examples it flares toward the mouth, like some liliaceous corolla (fig. 7, A, mus. no. 38661). In others 
it is shortened and wide (fig. 7, B, mus. no. 38662). In these stumpy examples the rostrum or the 
Carina may become longitudinally ribbed, the ribs rounded and not very prominent. 
These specimens from the northwestern Pacific agree with those from Alaska in the characters 
differentiating the species from the North Atlantic Balanus hameri Ascanius. 
Plates of the wall solid, without pores and without radii; base membranous, sometimes with a 
calcareous peripheral rim, which is poreless. 
This group was instituted by Dr. Hoek for two species, Balanus hirsu/us from the Faroe Channel 
and B. corallijormis from near Kerguelen Island. Two more are now described from Bering Sea, 
greatly extending the range of the group. 
In wanting radii these forms are more primitive than the typical Balani. The teeth of the mandible 
are longer and more slender than in most others of the genus. None of them are littoral barnacles. 
A 
B 
Fig. 7. — Balanus evermanni, x^. 
SECTION G. 
