53 



VENERUPIS. jj|l|jj) 



VENUS PERFORANS. 



Montague, page 127, tab. 8, Jig. 6. 

 This should be written Venerirupis, and is another 

 species of Borer or Lithophagus shell, by most au- 

 thors considered of the G. Venus; from which, how- 

 ever, notwithstanding the similarity of the hinge, it 

 must be separated, the teeth, on a careful examina- 

 tion, being rather differently disposed. Shells of this 

 family are only distinguished from the preceding ge- 

 nus, by having three primary teeth on one of the valves 

 at least. Shell transverse, inequilateral; posterior 

 side very short, anterior slightly gaping. Hinge, two 

 teeth on the right valve, three on the left, and some- 

 times three on both, which are small, contiguous, pa- 

 rallel, and but little, if at all, divergent. Ligament 

 exterior. 

 Venerirupis perforans Venerirupis exotica 



nucleus distans 



irus crenata 



Venerirupis carditoides. 



