THE NAUTILUS. 39 



Natural Sciences of Philadelphia. Type locality, northwest corner 

 of Peebles ranch, two miles up Elk Creek from Newcastle, Colorado, 

 where it was found in great abundance by Mr. Albert Dakan, in 

 April, 1908. Mr. Dakan was also the collector of the types of hen- 

 dersoni. I found dakani nine miles east of Meeker, Colorado, in 

 1909, where it was associated with 0. cooperi (W. G. B.). In color 

 the specimens from both localities average a trifle lighter than typ- 

 ical hendersoni, being almost white, with a slight creamy tinge. A 

 large series from the well-known colony on the south side of the 

 Grand River at Glenwood Springs, Colorado, is on an average very 

 much darker and less robust, but otherwise so closely agrees with 

 the Newcastle specimens that I have not thought a separate name 

 advisable. The forms of this species agree in the almost total 

 absence of spiral color lines on the last whorl. 



It may not be out of place to say here that Mr. Dakan has re- 

 cently found at Lyons, Colorado, typical specimens of 0. haydeni 

 betheli Pils. & Ckll. This carries its range across to the eastern 

 base of the Front Range, which constitutes the Continental Divide, 

 and 100 miles to the northeast of the type locality. 



TWO NEW ACHATINELLID.E OF OAHU. 



BY H. A. PILSBRT. 



In March last I went in company with Dr. C. Montague Cooke from 

 Honolulu to Hilo, Hawaii, chiefly for the purpose of studying Mr. 

 Thaanum's superb collection of Hawaiian shells. One of his recent 

 acquisitions was a sinistral Amastra, from Waiahole, which is certainly 

 new; and at his suggestion I name it for the companion of my Hawaiian 

 journey. Amastra montagui n. sp. is sinistral, imperforate, oblong- 

 conic, rather thin, chestnut colored, with a denuded ecru-olive patch in 

 front of the aperture. The surface has a somewhat silky gleam, due 

 to the rather fine wrinkles along lines of growth. The apex is ob- 

 tuse, embryonic whorls convex, nearly smooth; outlines of the spire 

 noticeably convex. Suture well impressed, the whorls a little swol- 

 len below it. The aperture is not very oblique, slate-violet within; 

 peristome black at the edge, strengthened by a low white callus 

 within; columella with reflexed and adnate edge, bearing a rather 

 strong, white, subtriangular lamella. Length 13, diam. 7.8, length 



