72 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
the shoulder, which they slightly nodulate, and reaching to the suture, but 
obsolete on the last whorl and not reaching much beyond the periphery; 
outer lip thin, sharp; inner lip erased; pillar short, obliquely attenuated in 
front ; canal short, distinct, slightly recurved. Height of shell, 10; of last 
whorl, 5; diameter, 4.5 mm. (Dali.) 
Type in United States National Museum, No. 216409. Type locality, 
Forrester Island, Alaska. 
Range. Known only from type locality. 
Subgenus Moniliopsis Conrad, 1865 
Clathrodrillia grippi Dali, 1919 
Plate 11, fig. 15 
Proceedings of the United States National Museum, 56:27; PI. 8, fig. 2. 
Shell slender with about eight (slightly decollate) whorls, livid oliva¬ 
ceous with a pale peripheral band, lighter near the aperture; suture 
appressed, on the upper whorls rudely nodulose; spiral sculpture in front 
of the fasciole on the spire of five or six strong cords with narrower 
interspaces overriding the ribs; the cords cover the last whorl, feebler 
on the periphery, coarser on the base; there are also faint spiral striae 
here and there; axial sculpture on the upper part of the spire; 14 or 15 
strong rounded ribs with wider interspaces, feebler on the penultimate, 
obsolete on the last whorl; aperture ovate, anal sulcus conspicuous, 
shallow; outer lip thin, simple; inner lip smooth; canal short, wide, not 
recurved. Height of shell, 27; of last whorl, 16; diameter, 10 mm. (Dali.) 
Type in United States National Museum, No. 203670. Type locality, 
San Diego, California. 
Range. Known only from the type locality. 
Clathrodrillia incisa Carpenter, 1865 
Plate 18, fig. 3 
Proceedings , Philadelphia Academy of Natural Sciences, 62. Proceedings of the United 
States National Museum, 56; PL 12, fig. 7. 
D. t. “D. inermi” forma et indole simili; sed cinerea, rufofusco copiose 
spiraliter lineata; anfr. nucleosis majoribus, subplanatis; anfr. normalibus 
vii. subplanatis spiraliter subobsolete coelatis; sulci in spira circiter viii., 
quarum quarta radiatim sinuata; canali quoad genus longiore, aperta; 
columella arcuata; labio distincto; labro tenui, parum sinuato; epidermide 
