136 OPEAS CLAVULINUM. 



near the obtuse apex. The upper part of the spire is wider 

 than in 0. gracile. Whorls 7, moderately convex; the suture 

 slightly irregular but not crenulate. Aperture about as in 

 0. gracile. Compared with 0. johanninum, this species is 

 smaller, less conic, and less deeply-grooved longitudinally. 

 Length 7, diam. 2.4 mm. 



Specimens collected by Dr. A. Brauer in Mahe, Seychelles, 

 in the plain and lower valleys, are described by von Martens 

 as 8 mm. long, fully 2 wide, with 7 whorls. 



The following forms are scarcely separable except by their 

 distribution. Both, however, seem to be less openly perforate. 



Var. ha/waiiense Sykes. PI. 17, fig. 97. 



"More cylindrical [than O.prestoni],i. e., the earlier whorls 

 increase more rapidly and the later ones less so, the color is 

 pale yellowish-white whereas the Ceylon shell is a light horn 

 color, the texture of the shell is thinner and more transpar- 

 ent, and the specimens I have seen are, on the average, 

 smaller" (Sykes}. 



"Hawaii: Kawailoa, Mauna Loa, at 1500 ft. (Perkins); 

 Hilo (Henshaw)." Also Honolulu (Dr. Win. H. Rush). 

 Kauai : Hanalei (Dr. B. Sharp, 1893) . Maui (D. D. Baldwin) . 

 Oahu, at Round Top and Manoa Valley (Bishop Museum). 



Opeas prestoni n. var. hawaiiensis SYKES, Proc. Malac. Soc. 

 Lond. vi, p. 113, fig. 3 (June, 1904). 



Mr. Sykes figures a specimen which from the size-mark was 

 9 mm. long. Most of those before me are smaller, about 7 

 mm. long. The perforation is very small, as in the Japanese 

 form which I have called kyotoense. Probably this Hawaiian 

 snail was brought there from Japan. A copy of Mr. Sykes' 

 original figure is given. 



Var. kyotoense Pilsbry. PI. 21, figs. 3, 4, 5, 6. 



Shell almost imperforate, turrited, translucent, waxen 

 whitish, glossy, arcuately, inconspicuously wrinkle-striate, 

 smoother below. General slope of the sides straight, apex 

 very obtuse. Whorls 71/2, quite convex, separated by deeply 

 impressed sutures. Aperture slightly oblique, somewhat ef- 



