914 BELA. 
species of the genus seems to have a longer and a shorter form, 
which often differ decidedly in appearance. This variation, 
which is also seen in many other genera of spiral shells, is prob- 
ably, to a certain extent, sexual; but it is not entirely so, for 
while the males seem usually to be long-spired, with narrower 
and flatter whorls, I have also found males among the short- 
spired ones. Moreover, there are, evidently, geographical races 
or varieties, as well as irregular individual variations, and pecu- 
liarities due to injuries of various kinds.” 
B. Scuantarica, Middendorff. Pl. 34, fig. 76; Pl. 30, figs. 96, 
97 Pl 29, fe a6; Pl. 335 fis: 70. 
Shell whitish or flesh-white, under a livid olivaceous epider- 
mis; smooth, or with fine spiral striz; aperture violaceous to 
white. L. 12, diam. 8 mill. 
Norway to Alaska. 
The synonymy is large, including B. gigas (Beck, MS.), Ver- 
kruzen (fig. 97), B. laevigata, Dall (fig. 96), and I think B. tenui- 
lirata, Dall, described as a variety of B. laevigata, with revolving 
striz, and afterwards called stmplex, by Verrill, from a specimen 
dredged, in 365 fathoms, off Martha’s Vineyard. 8B. simplex, 
Middendorff (Pl. 29, fig. 56), shell narrower, with longer spire, 
does not appear to me to present even varietal characters. JB. 
Morchi, Leche (P1. 33, fig. 70), is another name for B. gigas as 
figured by Verkrtizen, whilst for a variety differing in the more - 
produced, curved canal, the typical gigas of Beck, Mirch has 
proposed the name gigantea. Mr. Dall’s B. levigata is much 
smaller than the type, with shorter spire, and may constitute a 
geographical race or variety. According to Mr. Dall B. arciica, 
A. Ad., should be added to the synonymy. 
B. BICARINATA, Couthuoy. PI. 28, figs. 32-34; Pl. 27, figs. 18, 
26, 31. 
Whorls six or seven, the lower ones obtusely, the upper ones 
more acutely carinated, upper whorls with riblets on the subsu- 
tural band, sometimes crossing the carina, becoming obsolete on 
the body-whorl; fine revolving striz cross the growth-lines, and 
give the shell a finely decussated appearance ; a single revolving 
ridge on the spire below the shoulder-carina, and several less 
ay 
