PINNA. 259 



SPURIOUS. 

 P. carnea, Gmelin. 



Knorr, Delices de.s Yeux et de PEsprit, pt. 2, pi. 23, f. 1. 

 Pinna liaud ignobilis, Chemn. Conch. Cab. vol. viii. p. 212, pi. 87, f. 769. 



„ saccata, Schroter (not Linn, nor authors), Einleit. Conch, vol. iii. pi. 9, 

 f. 17. 



„ carnea, Gmelin, Syst. Nat. p. 3365. — Dillw. Recent Shells, vol. i. p. 

 326 (chiefly). — Index Testaceolog. pi. 12, Pinna, f. 6. — 

 Hanley, Recent Shells, vol. i. p. 252, pi. 12, Pin. f. 6. 



„ maricata, Pulteney (not author's), Hutchins, Hist. Dorset, App. p. 39. — 

 Mont. Test. Brit. p. 183, pi. 5, f. 3.— Dorset Catalog, p. 41. 

 — Turt. Conch. Diet. p. 149 ; Dithyra Brit. p. 224. — Flem- 

 ing, Brit. Anim. p. 406. 



„ fiabellum, Lam. Anim. s. Vert. (ed. Desh.) vol. vii. p. 61 (in part). 



A West Indian shell, introduced by Pulteney as found on the 

 Dorset coast, bid repudiated as British by most subsequent writers. 

 The original specimen, which is so worn as to be almost entirely 

 destitute of scales, is much less obliquely rounded at the wider end 

 than that represented, by Montagu, and exhibits six or seven rather 

 broad longitudinal costce. The P. muricata of the Linnean Trans- 

 actions (vol. viii. p. 113) is different, being cojned verbatim from 

 the " Museum Ulricce." 



tearing away the ground to which it is attached. In the latter case, a rich harvest 

 of shells is often afforded, but the pointed end of the Pinna is usually broken off 

 by the violence. It is perhaps owing to the different degree in solidity of the 

 ground, that the shells living in the deeper water are so much less buried than 

 those of which Montagu speaks, and one of the consequences may be a greater 

 degree of motion in the shell. Montagu observes that the exposed end cannot be 

 closed by art, but the animal is capable of effecting it, and observation has taught 

 me, that this is its method of obtaining food. In its ordinary position this open- 

 ing i-* about two inches wide, exposing the contained animal which occupies but a 

 .small portion of the cavity, and seems to offer itself as a prey to the first creature 

 that may choose to devour it. Some fish is thus tempted to enter, but the first 

 touch within is a signal for its destruction. The shell closes not only at the 

 side but top, the latter action being effected by the separation of the pointed 

 ends, and the captive is either crushed to death, or soon perishes, from con- 

 finement." 



