of mollusca. 13 



7. Chrysodomus. __ _ _ .. . _. ,. 



Fig. 9.— Teeth of Chrys. antiquum. 



Shell ovate, fusiform ; spire conic ; 

 whorls smooth, without any rudi- ) ->; 

 mentary varices ; canal very short, 

 straight. Operculum ovate, acute. 

 Animal olive. 



1. C. antiquus, t. 92. f. 1, t. 89. f. 8. Teeth (fig. 9). 



2. C. propinquus, Forbes fy Hartley, B. M. t. S.S. f. 1. 



3. C. Islandicus, Forbes $* Hartley, B. M. t. S.S. f. 2. 



4. C. bullosus. 



5. C, contrarius. 



6. C. Turtoni, Forbes $• Hartley, B. M. 



8. Strombella. 



Shell ovate, fusiform ; whorls smooth ; canal very short ; outer 

 lip expanded. Operculum oblong, rounded at each end. Animal 

 olive. 



I. S. Norvegica, Forbes fy Hartley, B. M. t. 107; t. 108. f. 7-9. 



B. Siphon recurved. Canal of shell very short and recurved, or 

 reduced to a notch. 



c. Pisaniana. Shell with rudimentary varices. Operculum ovate, 

 acute ; nucleus apical; edge entire, 



9. PlSANIA. 



Shell ovate ; spire conic, generally waved by the rudimentary 

 varices ; mouth ovate ; inner lip with a few slight plaits in front. 

 Operculum ovate, acute. 



1. P. striata, t. 90. f. 3, t. 98. f. 1, t. 98. f. 8. 



2. P. civetta, t. 87 a. f. 3. 



3. P. ? lineata, t. 5. f. 5. 



4. P. ignea, t. 5. f. 2. 



5. P. cincta, t. 5. f. 7. 



6. P. violacea, t. 5. f. 8. 



7. P. fasciolata, t. 5. f. 4. 



8. P. , n.s., t. 102. f. 20. 



9. P. undosa, t. 30. f. 1-4. 

 10. P. vittata, t. 34. f. 18, 19. 



II. P. lineolata, t. 5. f. 1. 



The teeth of Pis arri a striata are I • 1 • 1, central, crescent-shaped, 

 with five subequal, flat, tapering dentations ; lateral with a single, 

 acute, bent-up lobe, and slightly produced at the angle. 



The lingual membrane of Pisania ? is narrow elongate, dark 



brown ; inner end dilated ovate, darker, nearly opake. Teeth 1*1*1, 

 central rather broad ovate, three-toothed in front, lateral conical, 

 slightly curved. 



