CO^CHYUk—DITHYRA. 38. 169 



the other, white covered with an olive-brown skin, with nume- 

 rous nearly equidistant flat longitudinal ridges which are covered 

 with a fine brown downy pile: beaks nearer one end, rather 

 close together ; inside glossy with pale rays. 



^=^ Margine interno integerrimo. 5, 6. 

 With the inner margin very entire. 



A RCA testa ohlongd decussatd barhaid, latere antico angulato, peifoiaus. 



margine stibhiante. 

 Shell oblong decussate and bearded, angular at the anterior end, 

 and slightly open at the margin. 



Tah.nost. 13, fig. 2, 3. 

 Area perforans. Turton, Conch. Diet. p. 9. 

 Area lactea. Pennant, iv. p. 2!6, tab. 61, fig. 2. 



Ba Costa, p. 171. tab. 11, fig. 5. 

 Montagu, Test. Brit. p. 138. 

 Donovan, British Shells, iv. tab. 135. 

 Liinn. Trans, viii. p. 92. 

 r«r^OM, British Fauna, p. 160. 

 Dorset Catal. p. 36, tab. II, fig. 5. 

 Dillwyn, Descript. Catal. p. 236. 

 Pectunculus exiguus. Lister, Conch, tab. 235, fig. 69. 

 Mus. nost. Wedged in the interstices of rocks on the western 

 coasts, and sometimes inclosed in the interior of stones. 



^hell three quarters of an inch long, and rather more in 

 breadth, convex and sloping to the margin, angular on the 

 anterior side, white covered with a fine downy skin which 



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