CLASS GASTROPODA 
69 
SECTION MELANELLA s.s. 
Melanella montereyensis Bartsch, 1917 
Plate 39, fig. 6 
Proceedings of the United States National Museum, 53:320; PL 39, fig. 6. 
Shell broadly conic, falcate, flexed to the right, bluish-white, with a 
series of opaque areas, marking varical streaks. Early whorls well- 
rounded, the later ones slightly rounded, a little more so on the convex 
than the concave side. Sutures scarcely marked. The posterior deter¬ 
mination on the inside of the turns shines through the substance of the 
shell and appears as a conspicuous false suture. Periphery weakly angu- 
lated. Base short, very strongly curved on the left side. Aperture 
short, broadly oval; posterior angle acute, outer lip quite strongly pro¬ 
tracted at the periphery, inner lip oblique, curved, reflected and appressed 
to the base; parietal wall covered by a thick callus. Length, 5; diameter, 
2.2 mm. (Bartsch.) 
Type in United States National Museum, No. 181307. Type locality, 
Monterey, California. 
Range. Trinidad to Monterey, California. 
Melanella peninsularis Bartsch, 1917 
Plate 39, fig. 4 
Proceedings of the United States National Museum, 53:320; PL 39, fig. 4. 
Shell elongate-conic, very slightly curved, polished, surface marked 
by exceedingly fine lines of growth and exceedingly regular, very fine 
microscopic, spiral striations; bluish-white, except where the animal 
shines through the substance of the shell, when it appears brown. Whorls 
separated by a very poorly defined suture, which is inconspicuous com¬ 
pared to the false suture caused by the base of the preceding whorl 
shining through the substance of the succeeding turn. The whorls are 
marked at irregular intervals by thickened varices, which are very promi¬ 
nent. Periphery of the last whorl well-rounded. Base short, slightly 
rounded, the left side sloping very obliquely. Aperture broadly oval; 
posterior angle acute, outer lip decidedly protracted halfway between 
the posterior angle and the base; inner lip very oblique, moderately 
strong, slightly curved, reflected over and appressed to the base; parietal 
wall covered with a thick callus. Length, 5.2; diameter, 2.2 mm. (Bartsch.) 
(Bartsch.) 
Type in United States National Museum, No. 251264. Type locality, 
Lower California. 
Range. San Diego, California, to Magdalena Bay, Lower California. 
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