Plate 21 

 ATLANTIC COAST UNIVALVES 



a. FLORIDA WORM-SHELL, Vermiculnria 



knorri Desh., 5 inches (North Carohna 

 to Gulf of Mexico), p. 145. 



b. FARGO'S WORM-SHELL, Vermicidaria 



fnrgoi Olsson, 3 inches (West Florida 

 to Texas), p. 145. 



c. WEST INDIAN WORM-SHELL, Vermi- 



cidaria spirata Phil., 4 inches (Florida 

 Keys and West Indies), p. 144. 



d. IRREGULAR WORM-SHELL, Petalocon- 



chns irregularis Orb., 3 inches (Florida 

 and West Indies), p. 143. 

 c. BLACK WORM-SHELL, Petalconchm 

 7iigricaiis Dall, 3 inches West Florida), 

 p.^143. 



f. ATLANTIC MODULUS, Modulus vwdu- 



lus L., Yi inch (Florida to Brazil), p. 151. 



g. SLIT WORM-SHELL, Tenagodus squa- 



rnatus Blainville, 4 inches (Florida and 

 West Indies), p. 145. 



h. EASTERN TURRET-SHELL, Turriiella 

 exoleta L., 2 inches (Florida and West 

 Indies), p. 141. 



i. VARIEGATED TURRET-SHELL, Turri- 

 tella variegata L., 4 inches (West In- 

 dies), p. 141. 



j. BORING TURRET-SHELL, Turritella 

 acropora Dall, 1 inch (North Carolina 

 to West Indies), p. 141. 



k. BROWN SARGASSUM SNAIL, Litiopa 

 melanostoma Rang, 'Vin inch (Pelagic, 

 warm seas), p. 156. 



1. ERODED TURRET-SHELL, Tachyrhyn- 

 chus erosurn Couthouy, 1 inch (Nova 

 Scotia to Massachusetts, p. 140. 



m. COMMON ATLANTIC SLIPPER-SHELL, 

 Crepidula fornicata L., 2 inches (Ca- 

 nada to Texas), p. 170. 



n. CONVEX SLIPPER-SHELL, Crepidula 

 convexa Say, ji inch (Massachusetts to 

 West Indies), p. 171. 



o. CIRCULAR CUP-AND-SAUCER, Calyp- 

 traea centralis Conrad, ^ inch (North 

 Carolina to Texas, south), p. 169. 



hb. 



FALSE CUP-AND-SAUCER, Cheilea 

 ecfuestris L., % inch (Florida Keys and 

 West Indies), p. 165. 



SPINY SLIPPER-SHELL, Crepidula acu- 

 leata Gmelin, % inch (North Carolina 

 to Texas, south), p. 171. 



STRIATE CUP-AND-SAUCER, Crucibu- 

 lum striatum Say, 1 inch (Nova Scotia 

 to South Carolina), p. 170. 



WEST INDIAN CUP-AND-SAUCER, Cru- 

 cibulum auricula Gmelin, 1 inch (West 

 Florida, south), p. 169. 



WHITE HOOF-SHELL, Hipponix anli- 

 (juatus L., 3"2 inch (Florida, south; Cali- 

 fornia, south), p. 166. 



GRACEFUL MELANELLA, Melanella 

 gracilis C. B. Ads., 34 i'^ch (North Ca- 

 rolina to Gulf of Mexico), not in text. 



FAT MELANELLA, Melanella gibba D2 

 Folin, 34 inch (North Carolina to Gulf 

 of Mexico), not in text. 



TWO-LINED MELANELLA, Melanella 

 bilineata Alder, 3^ inch (North Carolina 

 to West Indies), not in text. 



ORBIGNY'S SUN-DIAL, Torinia bisulcata 

 Orb., i/;{ inch (North Carolina to Gulf 

 of Mexico), p. 142. 



KREBS' SUN-DIAL, Architectonica krebsi 

 Morch, Yj inch (North Carolina to 

 West Indies), p. 143. 



MALTBIE'S TRIVIA, Trivia maltbiana 

 Schw. and McG., 3? inch (North (>aro- 

 lina to Florida, south), p. 178. 



SUFFUSE TRIVIA, Trivia suffusa Gary, 

 ^/a inch (Southeastern Florida and West 

 Indies), p. 177. 



COFFEE BEAN TRIVIA, Trivia pediculus 

 L., Yj inch (Florida to Brazil), p. 177. 



LITTLE WHITE TRIVIA. Trivia candi- 

 dula Gaskoin, 34 inch (North Carolina 

 to West Indies), p. 178. 



