TECTURA. 267 



Fundy. It is that referred to as D. entale by Dr. Migliels. Having 

 had the opportunity of comparing nu- ^i^ 528. 



merous specimens of the European spe- 

 cies with ours, I am convinced they are 



. E. strtoiata. 



distinct. It differs from D. larenti- 



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

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

 destitute of longitudinal stria3. 



Tlie 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 PATELLID^E, D'Orb. 



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

 cresccntic, muscular impression, interrupted in tlie 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 witliin, dark brown. 



Patella testudinalis, Muller, Prodr. p. 237. — Fabr. Fauna Grocnl. 38.5. — Lam. An. 



sans Vert. vii. .543. — Dillwyn, Catal. 1045. — Wood, Catal. No. 63, pi. 37. 

 Patella testudinaria, Kaemerer, Rudolst. Conch. 12, pi. 2, figs. 4, 5. 

 Patella tfstudinaria (ircenlandica, Ciiemn. Conch, x. 325, pi. 168, figs. 1614, 1615. 

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

 Patella Clcalandi, Sowerbv, Records of Lin. Soc. viii. 621. — Fleming, Brit. Aniin. 



287. 

 Patella vinjinea, Mitller, Prodr. iii. 2867; Zool. D-an. t. 12, figs. 4, 5, 

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



Patella amaina, Say, Journ. Acad. Nat. So. ii. 223 (June, 1822) ; cd. Binney, 73. 

 Patelloiden itnioena, Couthouy, Bost. Journ. Nat. Hist. ii. 171. 

 PateUoida t^stndiwdis, Lea, Trans. Amcr. Phil. Soc. (New Scries), vii. 73. — De Kay, 



N. Y. Moll. 162, pi. 9, fi.i,^ 196. 

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



