PECTUNCULUS. 245 



ment external ; hinge semicircular, teeth oblique, small, 

 interlocking. Pallial impression entire, muscular scars 

 very strongly marked. 



Animal orbicular, its mantle freely open with simple 

 margins which are somewhat enlarged in the branchial and 

 anal regions ; foot large, semilunar, deeply grooved so as 

 to form a disk with undulated edges ; no byssus ; lips 

 formed of a linear prolongation of the branchial laminae. 



P. glycimeris, Linnseus. 



Plate XLVI. fig. 4, 5, 6, 7, and (Animal) plate P. f. 6. 



Lister, Hist. Conch, pi. 247, f. 82.— Knorr, Delicesdes Yeux, 

 pt. G, pi. 14, f. 4. 

 Area glycimeris, Linn. Syst. Nat, ed. 12, p. 1143; Mus. Ulric. p. 521. — Pen- 

 nant, Brit. Zool. ed. 4, vol. iv. p. 98, pi. 58, f. 58.— Donov. 

 Brit. Shells, vol. ii. pi. 37, f. 2. — Maton and Rack. Linn. 

 Trans, vol. viii. p. 93, pi. 3, f. 3. —Turt. Conch. Diction, 

 p. 7. — Dillw. Recent Shells, vol. i. p. 241. — Index Testa- 

 ceolog. pi. 10, Area, f. 36. — Ma WE, Conchology, pi. 13, f. 7- 

 Arcapilosa, Linn. Syst. Nat. ed. 12, p. 1143. — Pulteney, Hutchins' Hist. 

 Dorset, p. 35. — Mont. Test. Brit. p. 137, and Suppl. p. 53. — 

 Maton and Rack. Linn. Trans, vol. viii. p. 93, pi. 3, f. 4. — 

 Dorset Catalog, p. 36, pi. 11, f. 2.— Turt. Conch. Diction, p. C. 

 — Dillw. Recent Shells, vol. i. p. 242. — Index Testaceolog. 

 pi. 10, Area, f. 37. 

 Glycimeris orbicularis, Da Costa, Brit. Conch, p. 168, pi. 11, f. 2. 

 Area undata, Chemn. (not Linn.) Conch. Cab. vol. vii. p. 224, pi. 57, f. 560. 



„ marmorata, Chemn. Conch. Cab. vol. vii. p. 228, pi. 57, f. 563 (probably). 



I'eduHCiilus y/i/eimcris,TuRTOX (not Lamarck nor Philippi), Dithyra Brit. p. 171, 



pi. 1 2, f. 1.— Macgilliv. Moll. Aberd. p. 238. — Brit. 



Marine Conch, p. 103. — Brown, Illust. Conch. G. B. 



p. 85, pi. 33, f. 8, 9. — Burrows, Elements of Conch. 



pi. 8, f. 7. — Crouch, Introd. Conch, pi. 8, f. 11.— 



Reeve, Conch. Iconica, Pectunc. pi. 3, f. 12. 



„ pilosus, Lamarck, Anim. s. Vert. (ed. Desh.) vol. vi. p. 448. — 



Turt. Dithyra Brit. p. 172, pi. 12, f. 2.— Fi.em. EncycL 



Edin. vol. vii. p. 97, pi. 203, f. 18 ; Brit. Anim. p. 400.— 



Forbes, Malacol. Monensis, p. 42. — Brown, 111. Conch. 



G. B. p. 85, pi. 33, f. 10, 1 1.— Blainv. Manuel Mala- 



colog. pi. 65 bis, f. 3.— Philippi, Moll. SiciL vol. i. p. 6] 



