BIVALVES. 



PLATE LXI. 



Genus. MYTILUS. 



Character. Shell unequally oval and rounded ; the hinge without teeth, divided 

 by a line excavated longitudinally. 



Species. 



No. 1. Mytilus striatus. Shell of a dead brown colour, mixed with purple 

 lines closely placed, the form oval, but pointed at the hinge. From a shell 

 in the Museum of Mr. Bullock. 



No. 2. Mytilus lycophagus. Shell of a bright purple, and richly barred with 

 transverse longitudinal bands. 



No. 3. Mytilus denactus. Shell of a bright red, with transverse bands, and 

 crenated. From the Author's Museum, and supposed to be a native of the 

 East Indies. 



No. 4. Mytilus pictus. Shell large, of a pale pink colour, and richly orna- 

 mented, with conical veins, and spotted near the hinge. This shell is 

 generally found in the different Islands of the Eastern Seas. 



Genus. PINNA. 



Character. Shell triangularly shaped, covered with rough scales, and sometimes 

 with a hairy substance ; the hinge without teeth ; the shells held together by a 

 muscular valve. 

 No. 1. Pinna detusa. Shell oblong, covered with sharp pointed ridges, circularly 



arranged ; the shell thin and brittle. A native of the Island of Guernsey 



and of France. 

 No. 2. Pinna deflecta. Shell triangular, inflected, of a pale gray colour, 



adorned along the back and sides with undulated streaks, ending in small 



tubercles. This shell is also semitransparent. Native place unknown. 



REMARKS. 



The genus Mytilus is one of the most important of the Bivalves, as it furnishes in the muscle, 

 a useful article of food ; and if it were not so common upon our Coasts, would no doubt 

 be highly valued. 



The genus Pinna is chiefly found in the greatest abundance in the warmer climates of the 

 globe, and has a distant resemblance to those baskets of wicker-work in which salt is generally 

 packed ; they are said to be frequently used, in a scarcity of fish, in the Islands of the West 

 Indies, and found to be a delicious and agreeable sort of food. 



The Chiton, Sabella, and Lepas, are not inserted in this work, for reasons which have 

 been already alluded to in the Introduction ; and the Pholas is placed with the Bivalves, 

 from its analogy with that class of shell-fish, although its mode of life is in some respects 

 very different. 



