542 AXIN/EINiE. 



gins of valves plain, or crenate; beaks separated by a 

 grooved, lanceolate, ligamental area. Hinge semicircular, 

 with the teeth divided into small, oblique, interlocking 

 plates; ligament external. Muscular scars very strongly 

 marked; pallial impression entire. 



Sf/fi. Tuceta, Bolten. Glycimeris, Humph. Axino- 

 derma, Poll. 



Ex. A. glycimeris, Linnceus, pi. 126, fig. 1. Shell, A. 

 glycimeris, fig. I, a, 1, b. 



Out of forty-five species of Pectunculi, whose habitats 

 are pretty well known, nearly one-half will be found distri- 

 buted in America, leaving the remainder to be divided be- 

 tween the regions of Europe, Asia, Africa, and Australia. 

 They .inhabit sandy and muddy coasts, ranging from 

 shallow water to upwards of one hundred fathoms. One 

 species, A. glycimeris, is found in Great Britain and in the 

 Mediterranean. 



Species of Axincca. 



angulata, Chem. pennacea, Lam. 



aspersa, Adams and Reeve. perdix, Reeve. 



bimaculata, Poll. pilosa, Lam. 



decussata, Linn. radians, Lam. 



flammea, Reeve. raripicta, Reeve. 



formosa, Reeve. rubens, Lam. 



gigantea, Reeve. scripta, Bom. 



glycimeris, Linn. sculpta, Bom. 



holoserica, Reeve. septentrionalis, Midd. 



intermedia, Brod. spadicea, Reeve. 



lineata, Reeve. stellata, Gmel. 



longior, Sou*. striatularis, Lam. 



maculata, Brod. tellinreformis, Reeve. 



marmoi'ata, Chem. transversa, Lam. 



oblique, Reeve. undata, Linn. 



ovata, Brod. zonalis, Lam. 

 pallens, Linn. 



