550 



MOLLUSCA 



C. exanthema L. Shell brown in color, with round white spots 

 which may have brown centers, and a mid-dorsal yellow band; lip 

 violet within; length 11 cm.: Cape Hatteras to Panama, in shallow 

 water. 



C. spadicca Gray. Nut-brown cowry. Shell dark brown above and 

 lighter in the center; lips white; length 5 em. or less: California; not 

 common. 



2. Trivia Gray. Coffee-bean shells. Similar to Cyprasa, but with 

 transverse ribs, and much smaller: 45 species; cosmopolitan. 



T. californica Gray. Shell reddish-chocolate in color 

 and white inside, with a dozen sharp ribs ; length 10 mm. : 

 California, in shallow water. 



T.pediciilus(L.) (Fig. 

 860). Shell pinkish, with 

 6 black spots on the back 

 and 20 mm. long: Florida. 



3. OvULUM Bruguiere. Shell spindle- 

 shaped, the aperture being drawn out at 

 both ends into a canal ; inner lip smooth ; 

 outer lip toothed or smoth: 75 species; 

 in tropical seas. 



0. ovum (L.) (Fig. 861). Shell egg-shaped, white, with a yellow 

 aperture; length 9.5 cm.: Indian Ocean; used for ornaments. 



Fig. 860 



Trivia pedicu- 



lus (Rogers). 



Fig. 861 — Ovulum ovum (Rogers). 



Family 16. DOLIIDAE. 



Shell large, thin, with a short spire and a very large swollen whorl, 

 and covered with revolving ridges; operculum wanting; head long and 

 wide ; proboscis very long ; foot very large : about 30 species ; in tropical 

 seas; shell often used as domestic utensils. 



DoLiTJM L. Shell ovate; outer lip crenulated: 15 species, 4 on 

 the South Atlantic coast. 



D. galea L. (Fig. 862). Shell brownish-yellow in color, with 

 rounded revolving ribs; length 25 cm.: Cape Hatteras to Texas; the 

 West Indies, in shallow water; Mediterranean. 



Family 17. CASSIDIDAE. 



Shell thick, triangular or fusiform; spire short, partially immersed; 

 aperture long and narrow, terminating below in a short curved canal; 

 columella covered with a broad callus; outer lip broad, ribbed within; 

 operculum horny: 60 species, in tropical seas; about 7 on the South 

 Atlantic coast. 



