106 



EAST COAST MARINE SHELLS 



CERITHIUM EBURNEUM Bruguiere. Shell tuber- 

 culated or granose; one row of tubercles 

 larger and making an angle on center of up- 

 per whorls; often pure white and with few 

 varices* Length 25 mm. 



PI. 38, Fig. 13 



Southern Florida to Vfest Indies 



CERITHimi FLORIDANUM Morch. Shell usually 

 larger and broader than C. atratum, three 

 to four strongly incised lines between 

 principal pair of nodules, aperture often 

 more shouldered; outer lip thick and marked 

 by the terminations of the ribs which also 

 are indicated inside the aperture. Length 

 30-35 mm. 



PI. 38, Fig. 7 



North Carolina to West Florida 



CERITHIUM ATRATDM Born. Shell with two 

 rows of nodules, one of small nodules at 

 suture and another of larger ones below 

 and upon body whorl; four rows of indis- 

 tinct granules and also close lines; gray 

 with dark brown shades or entire covering 

 of chocolate brown; aperture blue or vio- 

 let when shell is dark. Length 25 mm. 



PI. 38, Fig. 15 



Southern Florida and West Indies 



CERITKira LITERATUfi Born. White, with 

 granular interstices spotted with broViTi; 

 shouldered by a row of tubercles Just be- 

 low the suture, another just above base of 

 body whorl; a wide low varix on body whorl 

 almost opposite the lip; outer lip thick- 

 ened, extending above upon previous whorl; 

 canal short. Color white, spotted with 

 black, color pattern of exterior showing 

 through inside. Length 20 mm. 



PI. 38, Fig. 11 



Southern Florida and West Indies 



CERITHIUM VARIABILE C. E. Adams. Shell 

 small, solid; wfiorls indistinctly rounded, 

 three rows of tubercles and seven to eight 

 on final whorl; varices scattered and al- 

 ways one opposite outer lip; small aper- 

 ture. Color dark, sometimes variegated 

 with white. Length 12 mm. 



PI. 38, Fig. 8 



South Carolina to Florida Keys; 



Gulf of Mexico; West Indies 



CERITHIUM MINIMUM Gmelin. Jet black or 

 ashy, often with a white sutural band or 

 white with a black band; low longitudinal 



ribs and indistinct revolving ridges which 

 cut the ribs into nodules; between the re- 

 volving ridges also faint threads; aperture 

 fairly large with canal below turned well 

 to the left. Length 15 mm. 



An excessively variable shell some- 

 times confused with C. variabile. It is not 

 so solid as the latter and more glossy, the 

 aperture usually larger and canal more de- 

 cidedly turned to the left. Some speci- 

 mens, hov/ever, are difficult to identify. 

 Length 13 mm. 



PI. 38, Fig. 21 



Tampa to Florida Keys; West Indies 



CERITHIUM MINIMUM SEPTEMSTRIATUM Say. The 

 name applied to specimens with a white su- 

 tural band. 



Tampa to Florida Keys; West Indies 



CERITHIUM MINIMUM NIGRESCENS Menke. Uni- 

 formly dark colored specimens. 



Tampa to Florida Keys; West Indies 



CERITHIUM MUSCARUM Say. Convex whorls 

 crossed by rounded ribs; white or brown with 

 minute chestnut punctations. Length 20 mm. 



PI. 38, Fig. 12 



Southern Florida to West Indies 



CERITKimi LUTOSUi'- C. B. Adams, rnorls 

 seven, suture moderately impressed, about 

 seven rows of encircling nodules upon color 

 zones which alternate from brown to yellow- 

 ish and with finely incised lines between, 

 all on the final v;horl; only four rows of 

 nodules on earlier whorls; interior whitish 

 but showing external color pattern. Length 

 9 mm. 



PI. 38, Fig. 24 



Palm Beach, Florida; West Indies 



GENUS CERITHIDEA Swainson 1840 



Aperture channelled in front; oper- 

 culxim corneous. 



CERITHIDEA AGUAYOI Clench (C. varlcosa 

 Sowerby) . Each v/horl marked with a varix; 

 these previous lips irregularly placed; 

 whorls ten, about twenty-or^e vertical ribs 

 on each whorl; surface dark brown with 

 lighter colored varices and band at periph- 

 ery. Length 22 mm. 



PI. 38, Fig. 17 



Texas and Cuba 



