264 ACHATINELLA C^ESIA. 



found in Waimea, correspond to A. undulata Newc., A. emer- 

 soni Newc., and A. glauca nob., found in Kawailoa" (Gulick). 



Oahu : Waimea, J. T. Gulick ; varieties at Kahuku, Kahana, 

 Hakipuu and Waikane. 



Achatinella ccesia GULICK, Ann. Lye. N. H. of N. Y. vi, p. 

 234, no. 53, pi. 8, f. 53, Feb., 1858. Achatinella concidens 

 GUL., t. c., p. 234, no. 54, pi. 8, f. 54. Achatinella formosa 

 GUL., t. c., p. 235, no. 55, pi. 8, f. 55. Achatinella cognata 

 GUL., t. c., p. 240, no. 60, pi. 8, f. 60. Achatinella scitula 

 GUL., t. c., p. 241, no. 61, pi. 8, f. 61. Achatinella cervina 

 GUL., t. c., p. 241, no. 62, pi. 8, f. 62. 



A. ccesia was the first to be described of a series of shells 

 somewhat larger in size than those of the dimorpha series, 

 usually streaked in peculiar hues, and so far as I know, they 

 are always sinistral and never have an ochraceous zone below 

 the suture of the embryonic whorls. These shells were rare 

 in Gulick 's time ; only ccesia and cognata were known to him 

 by more than one or very few specimens. To-day they are 

 practically unknown to Hawaiian naturalists. I do not re- 

 member seeing any recently collected specimens, and if not 

 actually extinct at the present time the species must be very 

 scarce and local. 



The distribution is conspicuously discontinuous ccesia, 

 concidens and formosa in Waimea, cognata and scitula in 

 Hakipuu, and cervina in Kahana ; yet the presence of another 

 form of the series (littoralis) in the sand dunes of Kahuku 

 serves to connect the extremes of its range, and permits the 

 suggestion that it was probably a species of the low-lying 

 forests of former times. This species then probably had the 

 range of A. dimorpha-albescens-zonata, but chiefly at lower 

 elevations. 



There seem to be several local races, although not so many 

 as Mr. Gulick defined. I would arrange them as follows : 



A. ccesia Gulick, including concidens and formosa Gul. 

 Waimea. 



A. c. littoralis P. & C. near Kahuku ; extinct. 



A. c. cervina Gul. Kahana. 



A. c. cognata Gul. Includes scitula Gul. Hakipuu and 

 Waikane. 



