1 8 Neiv Species of Aviastra. 



columella is slightl}- oblique, bent backwards below and flattened 

 above the perforation. The columellar fold is rather weak, oblicjue, 

 submedian iu position and does not quite reach the margin of the 

 columella. 



Length 20.6, diani. II .7, apert. S.4mm.; 7 whls. (Holotype) 

 " 20.0, " 12.3, " 9.0 " 7 " 



" 20.5, " 12.0, " 9.4 " 7 " 



18.0, " II. 8, " 9.2 " 6^3 " 



Hawaii: Kahauloa and Kealakekua elevation 4,360 feet and 

 near boundary between Keokea and Kiilae elevation 3,700 feet 

 (L. A. Thurston and T. C. White); Keei elevation 2,950 (A. F. 

 Judd). 



Holotype No. 41,963, cotypes and paratypes No. 39,661, 

 Bishop Museum. 



This interesting species was first collected by Mr. Judd in 

 February, 1915. His material consisting of a single live immature 

 specimen and a few adult dead and bleached specimens. Daring 

 August of the same year, Messrs. Thurston and White, collected 

 a fine series of this species at the type locality and a few additional 

 spscimens at the second locality mentioned above. 



A. viriosa is unlike any species so far reported from Hawaii. 

 Its nearest relative is probably the extinct A. senilis from Waimea. 

 The latter is a larger species, much more roughly sculptured and 

 has a larger perforation, besides being much broader in proportion 

 to its length. 



An immature specimen with four whorls is broadly conic, 

 with a distinct peripheral angle. It measures length 9.1, diam. 

 8.4 mm. The embryonic whorls are very finely and regularly 

 striate and there is an indication of three slightly raised spiral 

 striae. The post embryonic whorls are smoother and glossier than 

 the embryonic. The umbilicus is very distinct about half a mm. 

 iu diameter and obliquely angled along its margin. The columel- 

 lar fold is oblique, broad and low and extends nearly to the margin. 



A. fragosa, n. sp. 



PI. A. Fig. 4. 



The shell is narrowly umbilicate, dextral, conic, very thin, in 

 its fossil state of a pale dirty white. Spire acutely conical, con- 

 tracted above, with slightly concave outlines and a very acute apex. 



[236] 



