201 



thus distinctly defining the whorls ; the four first volu^ 

 lions with two distinct elevated ridges winding round 

 the middle which gradually disappear in the smaller 

 ones; aperture wide oval, ending in a slightly reflected 

 open canal ; inside pale yellowish white, outer lip very 

 thin, inner lip spread . 3. . . 1 , Dublin Bay, rare. 



F. RETROVERSUS. Fleming in Wern. Mem. 4. p. 

 498. t. 15 /. 2. P.p. 349. Whorls five, sinistral, 

 transparent, rounded, increasing rapidly (giving the 

 shell a bellied appearance) smooth and glossy; aperture 

 oblong, outer lip joining the body whorl at an acute 

 angle ; pillar straight, slightly scooped out at the apex 

 for the canal, which is shallow regular and short ; lines 

 of growth scarcely perceptible. 0,08. Zetland. 



* Whorls with longitudinal ribs. 



F, TURRICOLA. E. p. 349. MUREX T. Mont. p. 

 262. t. 9./. l.D.p. 744. Lin. T. S.p. 144. Dor. 

 Cat. p: 47. t. 14. /. 15. PLEUR T. Elaine. Faun. 

 Franc. Maeg> p. 171. M. ANGULATUS. Don. t. 

 156. Turreted, white and somewhat glossy, the apex 

 acute ; whorls seven, tapering, rather depressed, and flat 

 at the top, ribbed longitudinally, striated transversely, 



i. 3 



