10 CONCHYUk—DITUYRA. I. 



maigiu of the hinge on the inside of each valve just over the 

 teeth ; the accessorial valve at the back is lanceolate, being pro- 

 duced to a point atbotli ends. 



randida. puQ^As testii obovald, latere antico subctauso ohtuso, vahd 

 alterd lamind curvd marginali supra dentcm, accessQrio 

 unico cardinali. 

 Shell oboval, obtuse and nearly closed at tke anterior end, witb 

 a curved lamina in one valve above the tooth, and a single 

 accessorial valve at the hinge. 

 Pholas Candida. Linn. Syst. Nat. p. lUl. 

 Gmelin, Syst. p. 3215. 

 Turton, Linn. Syst. iv. p. 173. 

 Pennant, Brit. Zool. iv. p. 1$6, tab. 42, fig. 2. 

 Da Costa, J5rit. Conch, p. 2,1^. 

 Chenmitx, viii. p. 358, tab. 10.1, |fig. ^^X and 



8e2. 

 Montagu, Test. Brit. p. 24. 

 Donovan, Brit. Shells, iv. tab. 132. 

 Linn. Titans, viii. p. 31. 

 Turton, Bnt. Fauna, p. 145. 

 Wood, Conch, p. 79, tab. 14, fig. 3 and 4. 

 Dillwyn, Descript. Catal. p. 36. 

 Turton, Conch. Diet. p. 144, fig. 79. 

 Pholas parvus. iis^er, Conch, tab. 435, ^78. 

 Mus. nost. Inhabits marine rocks. 



Shell about an inch long, and nearly two wide, extremely thin 

 and almost transparent, with rather remote prickly stria; 

 at the larger end ; and may be distinguished by tiie larger end 



