26 N'ew Species of Amastra. 



ture, and indistiuctly malleate. Aperture not large. Columella 

 nearly straight, furnished with a rather strong slightly oblique fold . 



Length 39.0, diam. 21.3, apert. 16.5 mm.; 7^ whls. (Holotype) 



Molokai : Mauna Loa on the southern slope between the top 

 and Pohakuloa (Hitchcock); Hinanaula (G. P. Cooke); in vari- 

 ous localities near the north shore from the shifting sands on the 

 northern slopes of Mauna Loa to near Puukapele (Cooke); also 

 collected on the north shore of Molokai (Bryan). 



Holotype No. 41,962, paratypes No. 40,356, Bishop Museum. 



The original specimen of this species was collected by Mr. D. 

 H. Hitchcock, in May, 1913 and consisted of the aperture and a 

 portion of the last whorl. On four trips to Molokai, the writer 

 tried to relocate the original fossil bed but was unsuccessful. In 

 December, 1914, Mr. G. P. Cooke, found a number of examples at 

 Hiuauaulua on the northern coast of Molokai. LTnfortunatelj', the 

 only whole specimen was not quite mature. During March, 1915, 

 the writer spent about three weeks on Molokai, collecting for the 

 most part from the fossil beds of the northern coast from the north- 

 west point of the island to near Puukapele. A number of broken 

 and immature specimens were taken and in addition to these two 

 fine adults. One of these serves as a type of the species and came 

 from the second valley west of Puukapele. 



A. hitchcocki is closely related to A. violacea but differs in its 

 much greater size, rounded aperture and coarser striae. Some of 

 the specimens of A. v. wailauensis are nearly as large as a hitchcocki 

 but the two are easily separable as the outlines of the latter are 

 more conic, the aperture is wider and more rounded, the surface 

 more roughly striate and the columellar fold is stronger and less 

 oblique. The specimens of this species, from the shifting sands 

 and near the northeast base of Mauna Loa, are much smaller than 

 those from the deposits east of Moomomi. An adult specimen from 

 Kulainawawae measures length 32.3, diam. 18.0, apert 14.4 mm. 



( Pull a fa Su bseries . ) 



A. uniplicata var. vetuscula, n. var. 

 n. A. Fig. 5. 



The shell is minutely perforate or imperforate, dextral, conic- 

 cylindrical, solid, in its fossil state white. Spire couvexly conic, 



[244] 



