123 



Figures. 



Lucina borealis. Plate Q. Shell, with animal showing the long tubu- 

 lar foot and absence of siphonal tubes. From Forbes and Hartley, 

 Hist. Brit. Moll. 



Lucina punctata. PL 37. Pig. 204. Shell, with the left valve dropped 

 to show the hinge and rose-pink, marginal colouring. 



Genus 4. CORBIS, Cuvier. 



Animal; mantle open below, with the margin doubly fringed ; 

 siphonal orifice single, with a long retractile tubular valve. 

 (Adams.) 



Shell ; transverse, equivalve, nearly equilateral, stout, outer sur- 

 face elaborately latticed ; hinge composed of two cardinal and 

 tioo lateral teeth in each valve, one of which is situated near 

 the cardinal teeth, the other is remote from it. 



A limited group, allied to Lucina in the animal having no protruding 

 siphons, and possessed of shells of solid growth and of most exquisitely 

 latticed sculpture, resembling in general typical character some of the con- 

 centrically ridged forms of that genus. Pive species have been described, 

 but the best known are the C.Jimbriala and SowerlAi from the Moluccas. 

 The latter M. Deshayes identifies with a Grignon fossil found in the 



