OF MOLLUSCA. 17 



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, /. 



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



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



21. N. Lsvis, 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, Forbes fy 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 largelv 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. — LovSn, 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. — LovSn, 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. — LovSn, t. 5. f. 10. 



The tongue of Nassa (reticulata 1 !) 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. fy 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 eves. Foot folded across, dilated in front, with a small 



