TROCHIDAE 115 



% to I Inch in length, heavy for its size; whorls angular, with the upper 

 third slightly concave to flat and the somewhat angular periphery flatfish. 

 Early whorls with minutely beaded threads, later whorls with fine, smooth- 

 ish cords of various sizes. Nucleus tan to whitish. Color yellowish brown 

 with a few spiral lines of alternating brown and white bars. Sometimes axially 

 variegated. Dredged just off-shore from 8 to 35 fathoms. Moderately com- 

 mon. 



Calliosto772a gemmiilatii7n Carpenter Gem Top-shell 



Figure 33d 



Cayucos, California, to the Gulf of California. 



% inch in length, not as wide; characterized by its dark gray-green color 

 and two extra-strong, beaded spiral cords. There are also 3 or 4 minor cords 

 that are not so heavily beaded. Nucleus dark-tan. Moderately common in 

 the littoral zone on rocks and wharf pilings. 



Calliostoma supragranosmit Carpenter Granulose Top-shell 



Plate 1 8s 



Monterey, California, to Lower California. 



^ inch in length, solid, glossy; characterized by numerous, fine, spiral 

 cords which are sometimes weakly beaded, and by a wide, rather flattish pe- 

 riphery. Nucleus tan. Color light yellowish brown, commonly with a spiral 

 row of subdued white spots at the lower periphery. Interior brightly nacre- 

 ous. Moderately common on rocks at low tide. 



CalUost07na a7272ulatU77t Solander Ringed Top-shell 



Figure 33f 



Alaska to San Diego, California. 



I to 1/4 inch in length, not quite so wide; characterized by its light 

 weight, golden-yellow color with a mauve band at the periphery, and by the 

 numerous, spiral rows of tiny, distinct beads (5 to 9 rows in the spire whorls). 

 Nucleus pink. Dredged offshore and occasionally washed ashore. Formerly 

 C. annulatum Martyn. 



Calliosto77m canaliculatinn Solander 1786 Channeled Top-shell 



Plate 3q; figure 33!! 



Alaska to San Diego, California. 



I to 1% inches in length, not heavy, sides of whorl flat. Periphery of 

 the last whorl sharp. Base of shell almost flat. Characterized by sharp, promi- 

 nant, slightly beaded, spiral cords. Color yellowish tan. Nuclear whorls 

 white. Moderately common off^shore. Found on floating kelp weed. For- 

 merly known as C. canalicukumt Martyn, and doliarhmi Holten 1802. 



