CRYPTODON. 4C9 



teeth rudimentary or none ; cartilage in an oblique groove 

 of the hinder hinge-margin ; no externa] ligament. 



Syn. Anodontia, Link. 



Ex. L. lactea, Linnaeus, pi. 114, fig. 1. Shell, L. lactea, 

 fig. 1, a, 1, b. 



The species of Loripes, which are not very numerous, 

 are chiefly from the West Indies, the Mediterranean, and 

 the Philippines. 



Species of Loripes. 



anatellinoides. Reeve. ovulum, Reeve. 



barbata, Reeve. ovum, Reeve. 



bullula, Reeve. Philippiana, Reeve. 



chrysostoma, Meusch. Philippinarum, Hartley 



edentula, Linn. pila, Reeve. 



globulosa, A. Adams. plicifera, A. Adams. 



lactea, Linn. tumida, Reeve. 

 malum, Reeve. 



Genus CRYPTODON, Turton. 



Siphonal orifice prolonged and tubular, 



Shell thin, smooth, sub-orbicular, inequilateral ; surface 

 of valves with a radiating groove extending from the beaks 

 to the hinder extremity ; beaks small, acute ; lunule rather 

 large, sub-ovate. Hinge with a single erect, primary tooth 

 in the right valve ; ligament partly concealed by the over- 

 lapping margins of the valves. Anterior muscular impres- 

 sion double. 



Syn. Thyatira, Leach. Bequania, Leach. Axinus, 

 /. Sow. Pty china, Phil. Clausina, Jeffr. 



Ex. C. flexuosus, Montagu, pi. 114, fig. 2, 2, a. 



Of the few species of this genus at present described, 

 two are British, one is from Sweden, and one from Cuba. 



VOL. II. 3 p 



