205 



Genus 2. CYLINDRELLA, Pfeiffer. 



Animal ; similar to that of Clausilia. 



Shell ; elongately cylindrical, many-iohorled, sometimes truncated 

 at the apex ; last whorl frequently unrolled and curiously 

 protruding ; aperture small, rounded, with the lip generally 

 continuous and expanding. 



The genus Cylindrella was founded by Guilding under the name of 

 Siphonostoma,* for the reception of one or two peculiarly many-whorled 

 cylindrical land shells, then known as Ptqoce, which have been remarkably 

 added to within the last few years. Upwards of a hundred species, of the 

 most exquisite variety of form and sculpture, have been discovered, and 

 all, so far as their habitats are known, are, with one single exception (C. 

 Ctimlngiana, from the Philippine Islands), inhabitants of the West Indies 

 or Central America. 



Of all land shells the Cylindrella are the most rapidly convoluted, many 

 of the species turning twenty whorls and more before reaching maturity ; 

 and some of them, such as C. semimida, are quite fantastic in their form 

 and sculpture. The most striking feature in the genus is a certain ten- 

 dency, in many species, of the last whorl to strike off from its axis of con- 

 volution and end like a jutting spout. 



1. abbreviata, Desk. 



2. acus, Pfr. 



3. Adamsiana, id. 



4. Agnesiana, Ad. 



5. alabastrina, Pfr. 



6. alba, Ad. 



7. aspersa, id. 



8. Augusta?, id. 



9. Blandiana, Pfr. 



10. brevis, id. 



11. carinata, id. 



12. cinerea, id. 



13. collaris, Per. 



14. columna, Ad. 



15. costata, Guild. 



16. costulata, Ad. 



17. crispula, Pfr. 



* The name Siphonostoma h 

 by Dr. Pfeiffer to Cylindrella. 



Species. 



18. Cumingiana, id. 



19. cylindrus, Chemn. 



20. decollata, Nyd. 



21. denticulata, Pfr. 



22. Dominicensis, id. 



23. Dunkei'iana, id. 



24. elatior, Ad. 



25. elegans, Pfr. 



26. elougata, Chemn. 



27. fasciata, id. 



28. tilicosta, Sludt. 



29. fistularis, Mor. 

 30'. flammulata, Pfr. 



31. Goldfussi, Mke. 



32. Gossei, Pfr. 



33. Gouldiana, id. 



34. gracilicollis, Per. 



wing been already used in 



35. gracilis, Wood. 



36. gracillima, Poey. 



37. Gravesii, Adams. 



38. Greyana, id. 



39. Gruneri, Dunk. 



40. Hanleyana, Pfr. 



41. Hollandi, Adams. 



42. Humboldtiana, Pfr. 



43. huniihs, Adams. 



44. hyalina, Pfr. 



45. inornata, Adams. 



46. jejuna, Gould. 



47. lata, Adams. 



48. Laterradei, Grat. 



49. Lavalleana, Orb. 



50. leucopleura, Mice. 



51. Liebinanni, Pfr. 



zoology by Ottj, was changed iu 1840 



