TECTURA. 2G7 



Fundj. It is that referred to as D. entale by Dr. Mighels. Having 

 had the opportunity of comparing nu- ^..^ ^gs. 



mcrous specimens of the Euro})ean spe- 

 cies with ours, I am convinced they are 

 distinct. It differs from D. Tarenti- 



num in being larger, tapering more gradually to a point, in being 

 more rugose with the lines of growth and in being almost always 

 destitute of longitudinal striae. 



The length of one specimen is an inch and one half ; the diameter 

 at the aperture, one hundred and seventy-five thousandths of an 

 inch. Imperfect specimens indicate a length of two inches. (Stimp- 

 son.) 



Family PATELLIDyE, D'Orb. 



Shell depressed, conical or cap-shaped ; aperture wide, with a 

 crescentic, muscular impression, interrupted in the region of the 

 head. 



Ociius TECTURA, Aud. and Milne-Ed. 1830. 



Shell basin-shaped, apex obtuse, usually more depressed and 

 thinner than Patella, and distinguished from it chiefly by its in- 

 habitant. 



Tectura testudinalis. 



Fig. 12. 



Shell oblong-oval, greenish white, for the most part with brownish sub-divid- 

 ing radiations ; centre within, dark brown. 



Patella testudinalis, Muller, Prodr. p. 237. — Fabr. Fauna Gra?nl. 385. — Lam. An. 



sans Vert. vii. .'J43. — Dillwyn, Catal. 1045. — Wood, Catal. No. 63, pi. 37. 

 Patella testudinaria, Kaemerer, Rudolst. Conch. 12, pi. 2, fi^^s. 4, 5. 

 Patella trstudinaria (ircenlandica, Chemn. Conch, x. 325, pi. 168, fii^s. 1614, 1615. 

 Patella tessellata, Muller, Zool. Dan. Prodr. iii. 2868 ; Z. D. t. 12, figs. 6-8. 

 Patella Clealandi, Sowerby, Records of Lin. See. viii. 621. — Fleming, Brit. Anim. 



287. 

 Patella vin/inea, Muller, Prodr. iii. 2867 ; Zool. Dnn. t. 12, figs. 4, 5. 

 Patella vircjinea? Gmelin, 3711. — Dillwyn, Catal. 1052. 



Patella amaum, Say, Jourii. Acad. Nat. Sc. ii. 223 (June, 1822) ; ed. Binney, 73. 

 PateUoidea amcena, Couthouy, Bost. Journ. Nat. Hist. ii. 171. 

 Patelloida testudinalis, Lea, Trans. Amer. Phil. Soc. (New Series), vii. 73. — Dk Kay, 



N. Y. Moll. 162, pi. 9, fig. 196. 

 Patella cbjpeus, Brown, Conch, of Great Brit. &c. pi. 37, figs. 9, 10. 



