CLASS GASTROPODA 
71 
Subgenus Suavodrillia Dali, 1918 
Clathrodrillia kennicottii Dali, 1871 
Plate 6, fig. 5 
American Journal of Conchology, 7:102; PI. 16, fig. 2. 
Shell solid, acuminate, white, with traces of a thin yellowish epidermis. 
Columella twisted, canal slightly recurved; inner lip with a thin white 
callus; outer lip strongly flexuous, deeply excavated below the suture, 
exceedingly effuse anteriorly, thin and sharp. Nucleus smooth, white, small, 
obliquely bent. Sculpture of the upper whorls consisting of a very strong, 
broad, rounded carina, a little below the middle of the whorl, flattened on 
top, with a faint revolving ridge on each side of it, the lower one just 
above the suture, which is appressed. The whorls are quite flat except for 
the ridges and carina, and marked by strong oblique lines of growth. 
Last whorl flat above the carina and rounded below it. The ridge below 
the carina becomes almost as large as the latter, which is less prominent 
than upon the upper whorls. Below the ridge alluded to are others 
gradually diminishing in size anteriorly to the number of eight or ten, of 
which only two or three are at all prominent. Length, 0.84; lat., 0.36 mm. 
(Dali.) 
Type in United States National Museum. Type locality, North Harbor, 
Unga Island. 
Range. Bering Strait to Aleutian Islands. 
Clathrodrillia willetti Dali, 1919 
Proceedings of the United States National Museum , 56:29. 
Shell small, white, with a pale operculum with apical nucleus; nuclear 
whorls translucent white, glassy, inflated, about one and a half in number 
then gradually passing into the reticulate sculpture of the five or six subse¬ 
quent turns; suture appressed with one or two close-set prominent spiral 
threads in front of it; whorls sloping forward from these threads to an 
angle at the shoulder forming the periphery, this part of the whorl 
minutely spirally threaded; other spiral sculpture of (on the base about 
five) strong threads with wider interspaces containing minor threads all 
merging toward and on the canal into a series of subequal close-set 
threads; the anal fasciole has its deepest part at the shoulder angle, but 
the arcuate incremental lines on the whorl behind the angle indicate that 
it was when complete wide and shallow; axial sculpture of (on the 
penultimate whorl about 16) strongly protractive short ribs starting at 
[71] 
