320 FAUNA HAWAIIENSIS 



van semicarinata Newc. 



Achatinella semicarinata Newcomb, P. Zool. Soc. London, 1853 [1854], p. 156, 

 pi. XXIV. fig. 76. 



From an examination of the very fine series collected by Mr Perkins, I think 

 Newcomb was quite right in placing A. fulva and A. lactea in the synonymy. The 

 former is a straw-coloured form without banding and the latter a white form with a 

 reddish-brown stain in the interior of the aperture. Mr Baldwin remarks that A. 

 variabilis is ' invariably dextral,' but sinistral specimens, typical in every other respect, 

 were found by Mr Perkins. In placing A. semicarinata as a variety I have been 

 guided by the great difficulty I found in endeavouring to separate this form from A. 

 fulva, the type specimens of which shew traces of the carina. 



Mr Perkins remarks that ' the broader form with ridge more raised ' is ' from 

 higher elevations ' : it appears to be gradually replaced by the form fulva at lower 

 altitudes and this latter shades into A. variabilis (typical). 



Hab. Lanai (Newcomb, &c.) ; mountains (Perkins). 



(72) Achatinella [Parttilina] virgulata Mighels. 



Partiila virgjilata Mighels, P. Boston Soc. 11. 1845, P- 20. 



Achatinella virgulata Mighels, Reeve, Conch. Icon. Achatinella, sp. 3 ; Newcomb, 



Ann. Lye. New York, vi. p. 312 [animal]; Gwatkin, P. Ac. Philad. 1895, 



p. 238 [radulaj. 

 Bulimtis rohri Pfeiffer, Zeitsch. f. Malak. 1846, p. 115. 

 Bulimies insignis Mighels, Reeve, Conch. Icon. Achatinella, sp. 3. 



Hab. Molokai, Kaluaaha to Halawa (Baldwin); Mapulehu and mountains 

 (Perkins). 



It is a very variable species and the following, which I take to be a variety, is 

 perhaps worthy of note. 



var. a. Either entirely white or slightly tinted with brown on the last whorl ; 

 mouth varying from dusky to white ; the spiral black line on the upper whorls either 

 present or absent. 



Hab. Molokai, Pelekunu (Perkins). 



subgen. Achatinellastrum Pfeiffer. 



Achatinellastrum Pfr., Malak. Blatt. i. (1854), p. 133 (first species A. venulata 

 Newc). 



