CLASS GASTROPODA 
213 
interspaces, alternately coarser on the base; suture deep, the whorls below 
it often obscurely puckered near the suture; canal rather short, wide re¬ 
curved. Alt., 70; diam., 28 mm. (Dali.) 
Type in United States National Museum, No. 107006. Type locality, 
Bering Sea and Aleutian Islands. 
Range. Southern Bering Sea, Nunivak Islands to Aleutian Islands, 
Alaska. 
Colus nobilis Dali, 1919 
Plate 24, fig. 4 
Proceedings of the United States National Museum, 56:315. 
Shell large, regular, acute, whitish, with a warm yellow-brown per¬ 
sistent periostracum with eight whorls, exclusive of the very minute (lost) 
nucleus, separated by a very sharply defined suture, and elegantly rounded; 
spiral sculpture of (on the penultimate whorl, about 15) flattened, revolv¬ 
ing, close-set cords either in pairs or medially grooved for the most part, 
practically uniform over the whole shell; axial sculpture only of fine silky 
incremental lines; aperture rather wide, the outer lip expanded, thin, more 
or less crenulated internally by the effect of the external sculpture; body 
and pillar with a thick, continuous coat of enamel; canal distinct, short, 
slightly recurved; operculum solid, blackish, with apical nucleus. Height 
of shell, 85; of last whorl, 55 ; of aperture, 43 ; diameter, 38 mm. (Dali.) 
Type in United States National Museum, No. 222983. Type locality, 
United States Fish Commission Station 3484, in Bering Sea. 
Range. Near Pribilof Islands, in 60 fathoms. 
Colus calameus Dali, 1907 
Plate 7, fig. 4 
Miscellaneous Collections, Smithsonian Institution, 50:158. Bulletin 112, United 
States National Museum, PI. 10, fig. 5. 
Shell thin, white, covered with a straw-yellow periostracum and having 
about six well-rounded whorls; suture very distinct; apex eroded, nucleus 
apparently small; sculpture entirely spiral, of (between the sutures on the 
penultimate whorl, 12) flattish, low, equal, slightly rounded, spiral ridges, 
separated by narrower, subequal, channeled interspaces and crossed only 
by faint incremental lines; aperture milk-white, the body with an eroded 
polished area, the pillar thick and white, twisted and recurved anteriorly; 
canal wide, short, with no siphonal fasciole; outer lip thin, slightly re¬ 
flected. Long, of shell (tip eroded), 57; of last whorl, 42; of aperture, 
32; max. diam., 28; of aperture, 14 mm. (Dali.) 
I 213 ] 
