CLASS GASTROPODA 
185 
so on the apical whorls. The nucleus is heliciform, smooth and whitish- 
hyaline, comprising a whorl and a half. The ribs of the first three whorls 
are more or less beaded. Five radiating brown spots are to be seen on the 
apical whorls, and obsolete but similar markings may be seen on the others. 
The apex when eroded is light blue; the principal variations in color are 
in the darker or lighter brown of the interspaces. Northern specimens 
are usually darker and smaller. There is usually a small blue patch on the 
umbilical callus. The shell is distinguished from the sharp-ribbed speci¬ 
mens of costatnm by the more pointed apex, stronger carina, and less 
rounded aperture. (Dali.) 
Type in? Type locality? 
Range. Sitka, Alaska, to San Diego, California. 
Calliostoma canaliculatum nebulosum Dali, 1919 
Proceedings of the United States National Museum, 56:360. 
Shell resembling the typical form except that the whorls are painted 
with small brown nebulous patches in a radial fashion. (Dali.) 
Typical specimens in United States National Museum, No. 159251. 
Type locality, San Diego, California. 
Range. Known only from type locality. 
Calliostoma canaliculatum transliratum Dali, 1919 
Proceedings of the United States National Museum, 56:360. 
Shell in which the channels between the yellowish spiral cords are of 
a dark reddish-brown, giving the shell a somber appearance, much in 
contrast with the light straw-colored type. (Dali.) 
Type in United States National Museum, No. 160558. Type locality, 
Riorka Island, Sitka, Alaska. 
Range. Known only from type locality. 
Calliostoma variegatum Carpenter, 1865 
Plate 100, fig. 10 
Proceedings, Philadelphia Academy of Natural Sciences, p. 61. Dali, Proceedings of 
the United States National Museum , 24:552; PI. 39, fig. 10. 
C. t. parva, conica, variegata; nucleo rosaceo; anfr. vi. planatis, suturis 
haud impressis; costulis in spira iii. regularibus, nodulosis; nodulis albidis, 
subdistantibus; interstitiis elegantissime rosaceis; lirulis basalibus viii. 
haud nodulosis, rosaceo maculatis. Long., .24; long, spir., 13; lat., .21; 
div., 50°. (Carpenter.) 
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