PINNA bullata, (var.) 

 Rufous Pinna. 



Generic Character. 



Testa longitudinuUs, cuneiformis, wquivalvis, apice hiaiis, basi acuta ; 

 7iatibus rectis. Cardo lateralis, edentidiis. Ligamentum marginale, 

 lineare, prcelongum suhiuternum. — Lamarck, Sys. vol. vi. p. i. 

 p. 129. 



Shell longitudinal, wedge-shaped, equivalve, the valves gaping ; 

 the umbones straight, pointed. Hinge lateral, without teeth. 

 Ligament marginal, linear, very long, subinternal. 



Generic Types. Pinncenidis. Pectinata. Miiricata. Linn. Pennant, &c. 



Specific Character. 

 P. testa tenui, pellucidd, rtifu, cequilaterd, striis remotis, sulcatis, trans- 



versim squamiferis, subspinosis ; marginibus lateralibus rectis; 



margine inferiore obliqui truncato. 

 Shell thin, pellucid, rufous, equilateral, with remote sulcated striae, 



crossed by transverse scales and obtuse spines ; lateral margins 



straight; inferior margin obliquely truncate. 



P. bullata. Gmelin, p. 3367. Gualt. tab. 79./. c. Chemnitz. 8. tab. 87. 



/. 769. Knorr, 2.23./. 1. 

 P. marginata. Lam. Sys. 6. p. 132. 7. 



1 HAVE little doubt that this shell is a smooth variety 

 of the Pinna bullata of Gmelin, and the P. marginata of 

 Lamarck ; both these authors refer to the same figure in 

 Gualtieri, but both also have overlooked that of Chemnitz, 

 above quoted, as well as Knorr's, which latter, although it 

 represents the shell nearly smooth (similar to that here 

 figured), I apprehend is only a variety. No doubt therefore 

 having existed as to Gmelin's bullata, M. Lamarck had no 

 plea for altering its specific name to marginata. I have con- 

 sequently recorded it under Gmelin's name. 



The Pinnse are rather numerous, although many of the 

 species remain in obscurity ; they attach themselves to rocks, 

 deep in the sea, by a silky bi/ssus. It has been commonly 

 stated, that gloves and stockings are fabricated in the Medi- 

 terranean from this byssus, as articles of commerce; such, 

 however, is not now the case ; though articles, so fabricated, 

 are sometimes shown in Naples and Sicily as subjects of 

 curiosity. 



Pinna bullata is, I believe, found in the West Indies. The 

 vaulted spires on this and other species, easily fall off; and 

 become, therefore, a very uncertain specific character. 



PI. 158. 



