168 MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Aperture more than half as long as the shell, white and livid purple, with 
a dash of brighter purple at the posterior notch and on the anterior portion 
of the callus. Edge white, callus reflected, thick and strong, with a chink 
behind the anterior portion. Canal twisted to the right, moderately deep. 
Long., 4.13; lat., 1.62; long, apert., 2.59 in. (Dali.) 
Type in United States National Museum. Type locality, Pribilof 
Islands, Alaska. 
Range. Pribilof, Aleutian, and Shumagin Islands, Alaska. 
This was described at Voluta ( Scaphella) stearnsii. 
Genus PHENACOPTYGMA Dali, 1918 
Shell fusiform, with transverse and axial sculpture, elongated canal 
and apparently simple pillar; the axis in the upper whorls with two well- 
marked plications. 
This shell has the appearance of a Pleurotonioid, with the whorl con¬ 
stricted and appressed near the suture and a feeble incurvation of the 
margin of the lip at the constriction. By grinding away a portion of the 
apical whorls it was revealed that the axis is furnished with plications 
which extend to the beginning of the penultimate whorl. (Dali.) 
Type. Surculina cortezi Dali, 1908. 
Distribution. California deep water to Gulf of Panama. 
Phenacoptygma cortezi Dali, 1908 
Plate 13, fig. 7 
Bulletin, Museum of Comparative Zoology, 43:292. 
Shell slender, chestnut brown, fading to white or yellowish, fusiform, 
the spire shorter than the aperture, with more than five whorls; nucleus 
defective; somewhat constricted over the anal fasciole with an appressed 
suture, periphery moderately rounded; axial sculpture at the suture of 
small, little-raised folds, with wider interspaces, not surpassing the width 
of the fasciole; on the earlier whorls are small, feeble, narrow axial riblets 
extending to the suture (on the antepenultimate whorl, 14) with wider 
interspaces and almost vertical; these are crossed by very numerous flat, 
strap-like spirals with narrower channeled interspaces somewhat unequal 
in width and covering the whole shell; the entire surface is also sculptured 
with a multitude of fine spiral striae; outer lip thin, hardly arcuate; inner 
lip smooth, the surface erased; pillar anteriorly rapidly attenuated; anal 
sulcus shallow and inconspicuous; canal long and wide. Length of (decol¬ 
late 4*4 whorled) shell, 39-43; of last whorl, 29-34; of aperture, 24—27; 
max. diam., about 14 mm. (Dali.) 
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