410 



THE TERRESTRIAL MOLLUSCA INHABITIN( 



21. 



Partula 



assimilis, Pease . 



28. 



u 



hyalina, Brod. 



29. 



Tornatellina Philippii, Pfr. 



30. 



a 



oblonga, Pease 



31. 



a 



perplexa, Garr. 



32. 



u 



simplex, Pease 



83. 



u 



serrata, Pease 



34. 



u 



nitida, Pease 



35. 



u 



conica, Mouss. 



36. Vertigo pediculus, Shutt. . 



37. " tantilla, Gould 



38. Limax Rarotonganus, Heyn. 



39. Succinea costulata, Pease 



40. Melampus lateus, Q. et G. 



41. " fasciatus, Desh. 



42. Laimodonta conica, Pease 



43. Diadema parva, Pease 



44. " biangulata, Pease 



45. " rotella, Pease 



46. Omphalotropis ochrostoma, Pease 

 4Y. " variabilis. Pease 



48. " ovata, Pease 



49. Scalinella affinis, Pease 



50. " scalariformis, Pease 



51. Helicina parvula, Pease . 



52. " flavescens, Pease 



53. Cliondrella striata, Pease . 



54. Assiminea nitida, Pease . 



Earotonga. 



Aitataki. 



Atiu. 



Manga 



X 















X 



• • 



X 







X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



V 





. X 



X 



X 



X 



X 



X 



X 



X 



X 









. 



X 







. 



X 





, . . 



X 





• '• 





. 



X 







. X 



X 



X 



X 



. . . 



X - 



X 



X 



X 



X 



> X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



39 



28 



20 



19 



Total species 



When we take into consideration the small size of the islands, the largest 

 (Earotonga) not more than five or six miles in length, and the only one carefully 

 explored, we are astonished at the number of species and profusion of individuals 

 scattered over such small areas. 



Excepting the two Partula and Melampi, all the species are of minute size. 



E-arotonga, which is the largest and loftiest island, has so far yielded thirty- 

 nine species, twenty-one of which are peculiar. 



Aitutaki, which is only partly explored, has produced twenty-eight species, ten 

 of which do not occur elsewhere. 



Atiu has twenty species, two only of which are peculiar. All these species 

 were collected in a very small area in a dense forest near the sea-shore. 



