OF MOLLTJSCA. 71 



the foot ; of C. carneola red, and white dotted; of Cfelina pale, 

 black dotted ; of C. Talpa black, with small white specks ; of C. 

 caput serpentis brown, covered with red spotted tentacles. 



* Inner lip with a well-defined ridge in front. 



1. Cypr^ea. 



Shell ovate, polished ; spire bidden ; lip toothed ; anterior and 

 posterior canal distinct, recurved ; front of pillar lip smooth, broad, 

 deeply impressed, edged with a single large oblique fold in front, 

 separated from the teeth by a deep groove. 



Fig. 40. — Teeth of Cyprcea helvola. 



Central tooth of Cyprcea helvola small, wider at the base ; cutting 

 edge with a large lobe in the middle, and a smaller one on each side ; 

 lateral teeth somewhat similar ; first smaller, with long hooks ; a 

 tooth on the outside at the bend, and a small tooth on the inside 

 near the end (fig. 40). — Lovbn. 



a. Shell smooth ; columellar pit transversely ridged ; teeth of inner 



lip generally long. 



1. C. stercoraria, t. 34. f. 8, t. 35. f. 4. 



2. C. Tigris, t. 30. f. 1, 2, t. 32. f. 1 ? , t. 35. f. 6 $ . 



3. C. Tigrina, t. 31. f. 3, t. 35. f. 5. 



4. C. mauritiana, t. 31 . f. 1, t. 35. f. 2, t. 36. f. 5, young. 



5. O. arabica, t. 33. f. 6, t. 34. f. 1, t. 83 a. f. 5. 



6. C. vitellus, t. 34. f. 5. 



b. Shell smooth; columellar pit (nearly) smooth ; teeth of inner lip 



short or indistinct. 



7. C. Talpa, t. 31. f. 2 = Adams, Gen. Moll. t. 28. f. 1. 



8. C. Isabella, t. 36. f. 3. 



c. Shell : back warty (rarely smooth), base ridged. 



9. C. nucleus, t. 34. f. 4. 



d. Shell with transverse ribs. 



10. C. Childreni. 



e. Shell with longitudinal and transverse ribs. 



1 1 . C. Adamsonii. 



