Synopsis of the Genus Achatinella. 307 



4. A. gravida Fer. Desh. in Fer. Hist. II. p. 238. 



" suffusa Reeve. Mon. fig. 11. 



" Dimondi, C. B. Adams. Coutrib. to Conchol. p. 126. 



Animal of a light slate color above, thickly studded with black 

 tipped granulations ; tentacles black ; moderately clubbed ; 

 foot as long as the shell ; mantle dark chocolate ; slightly mar- 

 gined with white. 



The suffusa Reeve is a roseate variety with the epidermis 

 removed. This occasionally occurs while the animal still inha- 

 bits the shell. 



In the Imperial Museum the original type of Ferussac is 

 preserved, with a specimen of A. straminea Reeve as a variety, 

 on the same tablet. 



5. A. spirizona Fer. Hist. Moll. pi. 155, fig. 14. 



" acuta Swains. Zool. Illus. pi. 99, fig. 3. 



Animal when in motion longer than the shell ; thickly stud- 

 ded with very black granulations, with the interstices of a light 

 slate ; mantle of a yellowish white. 



6. A. turritella Fer. Hist. Moll. pi. 155, fig. 13. 



" Oahuensis Green. Mac. Lye. 1827. 

 " inornata Mighels. Boston Proc. 1845. 



Animal short, only half as long as the shell ; of a dark slate 

 color on the sides ; superior portion and tentacles black ; under 

 surface of foot light grey ; mantle dark brown. 



7. A. decora Fer. Hist. Moll. pi. 155, fig. 5. 



" vestita Mighels. Boston Proc. 1845. 



" perversa Pfr. non Swains. Mon. III. p. 465. 



" simulans Pfr. non Reeve. " " 



" lugubris var. Pfr. non Reeve. " " 



" vittata Pfr. non Reeve. " " 



