OF MOLLUSCA. 15 



Shell most like Pisania, but resembles some Ricinula and Pur- 

 pura in form ; it differs from them in the inner lip being extended 

 and veined. When young, the lips are simple ; throat smooth ; pillar- 

 lip concave, with a distinct oblique plait in front margining the canal. 



1. E. zonata. 



2. E. pyrostoma, Adams, Gen. Moll. t. 19. f. 11, shell only. 



12. Triumphis. 



Shell ovate, covered with a thick coarse velvety periostraca hiding 

 the colour ; spire conic ; whorls convex ; outer whorls larger, and 

 irregularly covering the rest. Mouth ovate ; inner lip smooth ; canal 

 very short, recurved. Teeth three ; central three-toothed ; lateral 

 large, hamate, three-toothed, outer largest. Operculum ovate, thick ; 

 nucleus apical. 



1 . T. distorta. 



It lives in crevices of rock between the low-water mark of the 

 neap tides and that of the spring tides on the reef of Panama (Adams) . 



d. Cominellina. Shell smooth, without rudimentary varices. Oper- 

 culum ovate, acute. 



13. Latrunctjlus. 

 Shell ovate ; spire conical ; whorls smooth, flattened behind ; 

 axis umbilicated; lips smooth. Foot moderate, rounded behind. 

 Operculum ovate, acute, edge entire. 



1. L. areolatus, t. S3, f. 2. 



2. L. spiratus, t. 85 a. f. 4 ; Adams, Gen. Moll. t. 11. f. 5. 



14. Cominella. 



Shell like Buccinum ; inner lip sometimes slightly concave ; axis 

 closed ; last whorl sometimes rather irregular, callous behind, and 

 partly covering the others. Operculum ovate, acute, outer edge 

 smooth. 



1. C. testudinea, t. 14. f. 1, 3. 



2. C. maculosa, Reeve, Icon. f. 85. 



3. C. pluriannulata. 



4. C. ligata. 



5. C. lagenaria. 



6. C. limbosa. 



7. C. lineolata. 



8. C. acutinodosa. 



9. C. costata, t. 102. f. 9. 



10. C. virgata, Quoy, Voy. Astrol. t. 30. f. 18; Adams, Gen. Moll. 

 t. 11. f. 6. 



The teeth of the male and female Cominella maculosa are alike ; 



