OF MOLLUSCA. 71 



the foot ; of C. carneola red, and white dotted; of C.felina 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. Cyprcea. 



Shell ovate, polished ; spire hidden ; 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). — Loven. 



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. C. 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. 



11. C. Adamsonii. 



