82 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
the anal sulcus shallow and more or less rounded, usually situated some 
distance from the suture, but not quite on the periphery of the whorl, the 
canal rather wide and long* and often a little recurved, the aperture un¬ 
armed. There are both dextral and sinistral species. (Dali.) 
Type. Surcula perversa Gabb. 
Antiplanes perversa Gabb, 1865 
Plate 11, fig. 9; Plate 28, fig. 8 
Proceedings of the California Academy of Sciences, 5:183. Paleontology of California, 
2:6; PI. 1, fig. 10, 1866. 
Shell small, sinistral, elongate, slender; spire high, apex usually bent to 
one side; whorls eleven to twelve, convex, two nuclear whorls rather 
loosely twisted and more convex than the others; suture deep; body whorl 
nearly half of the entire length of the shell. Aperture broadest in the 
middle, narrowing regularly in advance ; inner lip moderately incrusted; 
outer lip simple; sinus rather broad, shallow, rounded, and adjoining the 
suture; canal of variable length, often much larger than in the specimen 
figured. Length, 38; diam., 11 mm. (Gabb.) 
Type in? Type locality, San Pedro, Post-Pleiocene. 
Range. Forrester Island, Alaska, to Cortez Banks. 
This was described as Pleurotoma perversa by Gabb. 
Antiplanes vinosa Dali, 1874 
Plate 28, fig. 4 
Proceedings of the California Academy of Sciences, 5:253. Proceedings of the United 
States National Museum, 24: PI. 34, fig. 1, 1902. 
This shell is closely allied to P. perversa, of Gabb, from the Straits of 
Fuca and Catalina Island, but differs in the following particulars: 
P. perversa has a light olivaceous epidermis, which gives a livid appear¬ 
ance to the light reddish brown of the whorls outside; and the broad, 
white band, with ill-defined edges, passes around the periphery of the shell, 
just covered by the suture in the upper whorls. The columella, end of 
the canal, and tip of the shell, are also white. The present form is of a 
uniform deep wine-brown, or claret color; is shorter and much less 
slender, with a shorter canal and proportionately much larger aperture. 
Both shells are reversed, and covered with fine, somewhat irregular spiral 
lines, not mentioned by Gabb in his diagnosis. (Dali.) 
Type in United States National Museum. Type locality, Kyska Har¬ 
bor, Great Kyaks Island, Alaska. 
Range. Bering Sea to San Diego, California. 
This was described as Pleurotoma vinosa by Dali. 
[821 
