133 



or tjifoe ray-like indentations running from the mafgiii 

 towards the apex ; the pillar lip slightly turned inwards. 

 i...i. Devonshire, fyc. not common. 



P, MEMBRANACEA. P.p. 291.--LAMELLARIA M. 

 Morit. in Lin. T. II. p. 184. t 12. (f. 3. animal) f. 4; 



Ovate, excessively thin, flat, with a minute lateral 

 whorl, silvery tinged with pink. 2. English Coast) 

 rare. 



TRIBE. CALYPTRACIAN^E. 



Shell always external. 



GENUS. EMARGINULA. 



Conical, shield-shaped, the vertex inclined to one side , 4 

 internal cavity simple ; posterior margin cleft or 

 emarginated. 



E. FISSURA. Lam. l.F. p. 364. PATELLA F. 

 Lin. 1261. D.p. 1054. Pen. 4. p. 144. t. 90. / 

 151. List. t. 543. /. 28. Don. t. 3./. 2. Mont. p. 

 490. Dor. Cat. p. 59. t. 23. /. 4. Conical, white or 

 yellowish with close set prominent radiating ribs, can* 

 cellated in the interstices by transverse striae, pellucid, 

 apex reflected ; margin crenated j slit narrow and long, 

 variety ( ROSE A. Sell in Zool. J. 1. 1. 4 /.I.) apex 

 higher and more recurved; inside rose-colored. i.d.f< 

 E. Coasts, 



