EAST COAST MARINE SHELLS 



139 



Family Acteoclnldae (Tornatinidae) 



Shell cylindrical or fusiform; 

 spire conic or flattened; apex projecting, 

 mamillar and left handed; suture channelled; 

 one fold upon columella at Junction with 

 the whorl. 



GENUS ACTEOCINA Gray 1847; Tornatina, 

 A. Adams 1850 



ACTEOCINA CANALICULATA Say. Channelled 

 Little Acteon. Shell almost cylindrical, 

 spire elevated slightly; top of whorls 

 grooved; white, shining, faint growth lines; 

 whorls five. Length 3-5 mm. 



PI. 71, Fig. S7 



Cape Cod southward to Haiti 



ACTEOCINA CANDEI Orbigny. Shell small, 

 widest on shoulder; surface smooth except 

 for faint growth lines, shining, milk 

 white; outer lip advanced in center; fold 

 on columella moderate. Length 2.5 mm. 



A rather frequent shell in Florida 

 but not so often taken alive. 



PI. 53, Fig. 14 



PI. 65, Fig. 13 



Cape Hatteras, North Carolina to 



West Indies 



ACTEOCINA RECTA Orbigny. Straight Little 

 Acteon. Shell oblong, cylindrical, shin- 

 ing, thin, white, spirally and lightly sub- 

 striate; spire short, suture channelled; 

 indistinct fold on columella. Lengths mm., 

 diameter 1 mm. 



Separated from A. candei by the 

 spiral sculpture and indistinctness of the 

 columella fold, from A. bullata by its 

 smaller size. 



PI. 57, Fig. 10 



Florida Keys and West Indies 



ACTEOCINA BULLATA Kiener. Shell ivory 

 white, solid, a little contracted in center; 

 spiral striae fine and covering surface but 

 becoming fainter at shoulder; apex mamil- 

 lar, minute, projecting and turned over; 

 suture well channelled, whorls not concave 

 above; one strong fold on columella, outer 

 lip somewhat inflexed. Length 11 mm., 

 diameter, 5 mm. 



The largest West Indian Acteocina. 



PI. 53, Fig. 21 



Florida Keys and West Indies 



GENUS RETUSA Brown 1827 (BLUNT SHELL) 



RETUSA PERTENUIS Mighels. Thin Blunt Shell. 

 Shell very small, white; aperture narrow 

 above, wide below; no spiral sculpture. 

 Length 2.5 mm. Depth range 10-294 fathoms. 



PI. 57, Fig. 14 



PI. 71, Figs. 25, 26 



Greenland to Fernandlna, Florida 



RETUSA CAELATA Bush. Range 15-294 fathoms. 

 PI. 65, Fig. 15 

 North Carolina to Fernandlna, 

 Florida 



GENUS VOLVULA A. Adams 1850 not 

 Sistel 1848 (WRAPPER SHELLS) 



VOLVULA ACUTA Orbigny. Range 15-124 fath- 

 oms. 



PI. 65, Fig. 11 



Cape Hatteras, North Carolina to 



West Indies 



VOLVULA OXYTATA Bush. Shell minute, dull 

 milk white; much produced and pointed above; 

 upper half of aperture very narrow, gradual- 

 ly increasing in width below; inside wall 

 with distinct callus; columella oblique, 

 outer lip acute and curving inward at cen- 

 ter; interior lustrous. Length 3.5 mm. 

 Range 5-63 fathoms. 



A single example was taken by the 

 writer on the North Inlet bar at Palm Beach, 

 Florida. 



PI. 53, Fig. 1 



PI. 65, Fig. 12 



Cape Hatteras, North Carolina to 



Cuba 



GENUS ATYS Montfort 1810 



ATYS SHARPI Vanatta. "Shell small, sub- 

 cylindrical, solid, porcellanous, glossy, 

 translucent bluish white, very finely spi- 

 rally striate, striae strongest above and 

 below. Apex with an external small perfora- 

 tion; base umbilicate; aperture narrow 

 above, broader below. The lip rises from 

 the right side of the apical perforation 

 and describes a more or less even arc above 

 without the twist so common to this genus. 

 The outer lip describes a gentle curve and 

 the basal lip is arcuate. The columella is 

 concave with a slight twist." Length 7.8 

 mm., diameter 3.8 mm. 



