118 Mv. !M. Connolly ov iion-marinc Mollusca 



Trachycyafis soror, sp. ii. 



Shell minute, depressed, eonic-globose, umbilicate, thin, 

 pellncid, pale corneDUs. Spire somewhat raised, apex rounded. 

 Whorls 3], regularly, but not very rapidly, increasing ; proto- 

 conch rather indistinctly microscopically punctate for halt" a 

 whorl, and then showing rather distant radial striae, corre- 

 sponding to the lamellne on the later whorls, which are 

 sculptured witli transverse lamellse, of which there are about 

 20 ou the last whorl, where they are from •12 to "15 mm. 

 apart, interspersed with rather fine, irregular transverse, 

 crossed by very fine spiral, striae ; suture well-defined. 

 Aperture rounded-lunate ; peristome simple, acute; umbilicus 

 rather wide, extending to the summit and exposing all the 

 whorls. 



Diaui. maj. 1*5, min. 1*3 mm. ; alt. circa 0*8 mm. 



Type-locality. Mount Vengo, 5500 ft. [B. Cressy). 



Trachycystis pura, sp. n. 



Sliell minute, depressed cii*cular, umbilicate, thin, milky- 

 translucent. Spire nearly flat. Whorls 3^, slowly and 

 regularly increasing, covered all over with close, strong, 

 regular, nearly straight, transverse striae, which are about 

 "025 mm. apart on the last whorl, but closer together 

 towards the apex, except on the first half of the first whorl, 

 where they are slightly more distant than on the second 

 half; protoconch furnished with almost invisible spiral striae, 

 which also occur round the umbilicus ; suture narrow, but 

 well defined. Aperture rounded-lunate ; ])eristome simple, 

 acute ; umbilicus rather wide, extending to the summit and 

 exposing all the whorls. 



Diam. maj. 1'2, min. TOo ; alt. 0*7 mm. 



Type-locality. Mount Vengo, 5500 ft. {B. Cressy). 



Trachycystis venyoensis, sp. n. 



Shell minute, umbilicate, depressed-globose, thin, trans- 

 lucent, reddish corneous. Spire nearly flat, each whorl just 

 showing ahove the next. Whorls 3|, rounded, gradually 

 increasing, protoconch microscopically reticularly punctate, 

 remainder covered on both sides with microscopic, close, 

 straight, regular, transverse strise, crossed by almost invisible 

 spiral striation round the umbilicus; suture simple, deep. 

 Aperture rounded-lunate; peristome thin, simple ; columcllar 



