646 



posteriorly substriated, curiously coloured near the urubones and 

 inside with mottled grey and purple ; in the centre of the outer 

 surface of a dull bay ; at the margin yellow, with brown angular- 

 markings. 



Locality unknown. Specimen in Mr. Cuming's collection. 



115. Cytheiwea splendens (pi. cxxxv. f. 167), Sowerbyjun. 



Cyth. testa C. lentiginosis simili, sed magis rotundata ; margine 

 dorsali vix excavato, margine ventrali subinfiato ; colore pallide 

 fulvo, griseo nebulato, maculis obliquis castaneis suffusis utrinque 

 variegato. 



The difference between this species and C. lentiginosa is more 

 easily seen than described. This is rather more rounded, and 

 fuller at the dorsal margin ; the colouring is a bright tortoise-shell, 

 arranged in angular patches on each side, which join each other 

 at intervals. 



The specimens, which are very beautiful, are in the collections 

 of Mr. Gubba and Mr. Sowerby. 



LIST OF FIGURES IN PLATES CXXVII. TO CXXXVI. 



{The Figure after each name is the number of the Species.) 



Plate CXXVII. 



Fig. 



1-3. C. Crassatelloides, 1. 



4. — dubia, 2. 



5. — virginea, 3. 



6. — ventricosa, 5. 

 7-9. — Damaoides, 4. 



10, 11. — bicolor, 19. 



12. — undulata, 21. 



13. — planulata, 20. 



14. — polita, 22. 



15. — DolabeUa, 23. 



Plate CXXVIII. 



16. — trigonella, 17. 



Fig. 







17. 



C. 



incerta, 18. 



18-22. 





tripla, 6. 



23, 24. 





Hanleyana, 16. 



25. 





nitidula, 14. 



26. 





lineata, 15. 



27. 





Hindsii, 8. 



28-31. 





radiata, 9. 



32. 





gracilior, 10. 



33, 34. 





compressa, 13. 



35. 





intermedia, 12. 



36. 





Mactroides, 11. 



37-39. 





corbicula, 7. 



40-42. 





lusoria, 26. 



