OF MOLLUSCA. 1 7 



11. N. pauperata, t. 21. f. 4. 



12. N. fasciata, t. 21. f. 5. 



13. N. globosa, t. 21. f. 7. 



14. N. reticulata?, t. 21. f. 8. 



15. N. gibba,t. 102. f. 11, t. 21. f. 9, 10, 11. 



16. N. cornicula, t. 24. f. 11. 



17. N. ascanias, t. 21. f. 12. 



18. N. ?, t. 85a. f. 1, 2, 3, 5, 6, 7. 



19. N. (Cyclope) neritea, t. 24. f. 8 ; Adams, Gen. Moll. t. 12. f. 8. 



20. N. ?, t. 102. f. 13. 



21. N. lsevis, Adams, Gen. Moll. t. 12. f. 7. 



22. N. incrassata, Forbes fy Hanley, B. M. t. L.L. f. 1 . 



23. N. varicosa, Forbes fy Hanley, B. M. t. L.L. f. 2. 



24. N. reticulata, jFWfo* #• Hanley, B. M. t. L.L. f. 3. 



The central teeth of Nassa are broad, arched, pectinated ; the 

 lateral teeth with a basal hook. 



The Nassa annulata has the front of the central tooth entirely 

 pectinated ; the scape of the lateral tooth largely spinulose. — Loven, 

 t. 5. f. 7. 



The central tooth of N. reticulata angularly produced into an 

 angle in front, each edge smooth at the angle ; the scape of the 

 lateral tooth unarmed. — Loven, t. 5. f. 8. 



The central tooth of N. incrassata produced into an incurved 

 angle in front, edge on each side smooth ; the lateral tooth broad, 

 with a larger, one-spined, basal tooth. — Loven, t. 5. f. 9. 



The central tooth of N. arcularia narrow, united in front ; sides 

 smooth ; the scape of the lateral tooth smooth, with a longitudinal 

 lamina between the base of the teeth. — Loven, t. 5. f. 10. 



The tongue of Nassa (reticulata!) is linear, very transparent. 

 Teeth 1-1*1, central crescent-shaped, with twelve subulate, sub- 

 equal, elongate toothlets; lateral teeth angular, bent, outer angle 

 rather produced, base simple, narrow, apex acute, rather curved. 



The egg-cases are small, ovate, acute, in series on sea-weeds, coral- 

 lines, &c. — Peach, Ann. $• Mag. Nat. Hist. xiii. 1844, 204. fig. 



17. Desmoulea. 



Shell subglobose ; spire short. Teeth ? Operculum subtri- 



gonal, truncated, dentated. 



1. D. pinguis, Adams, Gen. Moll. t. 2. f. 6. 



f. Phosina. Operculum with a notch on the left side of the tip. Shell 

 with a slight sinus in the front of the outer lip, like the 

 Strombs. 



18. Phos. 



Shell ovate or turrited ; spire conic ; whorls undulated ; mouth 



ovate ; outer lip with a sinus in front ; inner lip with a sharp fold in 



front. Tentacles linear ; eyes within one-third of the tip, very thin 



above the eyes. Foot folded across, dilated in front, with a small 



