CLASS GASTROPODA 
219 
Colus tahwitanus Dali, 1918 
Proceedings of the United States National Museum, 54:228. 
Shell small, buccinoid, with about six whorls; nucleus eroded, suture 
deep, not appressed; whorls well-rounded; sculpture of fine even uniform 
grooves with wider flat interspaces over the whole shell; periostracum 
dull, olivaceous; interior white, outer lip reflected, arcuate; pillar and body 
erased, axis twisted, almost pervious, canal very short and strongly re¬ 
curved. Height, 33; max. diam., 17 mm. (Dali.) 
Type in United States National Museum, No. 122632. Type locality, 
off Tahwit Head, Washington, in 178 fathoms. 
Range. Known only from type locality. 
Colus morditus Dali, 1919 
Plate 13, fig. 1 
Proceedings of the United States National Museum, 56:319. 
Shell small, solid, polished, of about seven whorls, the apex decorti¬ 
cated, rather acute, the whorls moderately rounded, the suture distinct, 
not appressed; axial sculpture of feeble incremental lines, their inter¬ 
sections slightly punctating the grooves; spiral sculpture of numerous 
shallow grooves with much wider flattish interspaces over the whole sur¬ 
face ; outer lip thin, sharp, arcuate; inner lip erased, pinkish, pillar white, 
attenuated in front; canal wide, distinct, short, slightly recurved. Height 
of shell, 28; of last whorl, 20; of aperture, 15; diameter, 13 mm. (Dali.) 
Type in United States National Museum, No. 222599. Type locality, 
United States Fish Commission Station 4198, Gulf of Georgia. 
Range. Known only from type locality. 
Colus timetus Dali, 1919 
Plate 13, fig. 2 
Proceedings of the United States National Museum, 56:318. 
Shell small, thin, with a thin pale olive periostracum, and five or more 
whorls, the apex eroded; suture distinct, not appressed; axial sculpture 
none; spiral sculpture of (on the penultimate whorl, about 33) fine, regu¬ 
lar, sharp striae with wider flat interspaces, for the most part uniform, 
but near the periphery tending to be wider, this sculpture covering the 
whole surface; aperture wide, semilunate, outer lip gently arcuate, thin, 
inner lip erased, white, pillar straight, attenuated in front, canal wide, 
deep, very short, with a well-marked siphonal fasciole. Height of shell, 
30; of last whorl, 22; of aperture, 15; diameter, 16 mm. (Dali.) 
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