216 GASTROPODA. [Pectinibranchia. 



short, vertical, a little arcuate. A distinct umbilical chink is present. 

 Operculum, unknown. 



Diameter, 1-25 mm. ; height, 1-9 mm. 



Animal unknown. 



Type in my collection. 



Hab. Port Pegasus, Stewart Island, in 18 fathoms (Captain 

 Bollons). 



29. Rissoa verecunda, Suter, 1908. Plate 13, fig. 4. 



Rissoa verecunda, Suter, P. Mai. S., viii, 30, pi. 2, f. 28. 



Shell minute, ovate, rimate, solid, slightly shining, smooth. Ther<' 

 is no sculpture except fine growth-lines. Colour very light horny ; 

 dead shells are cretaceous. Spire conical, very little higher than the 

 aperture ; outlines slightly convex. Protoconch small, papillate, of 1% 

 smooth and convex whorls. Whorh 4, the last high, lightly rounded ; 

 base convex. Suture impressed. Aperture oblique, oval, angled above. 

 Peristome continuous, thickened, with a blunt edge. ColumeUa short, 

 arcuate. Inner lip slightly reflexed, forming a narrow umbilical chink. 

 Operculum unknown. 



Diameter, 1-25 mm. ; height, 2 mm. 



Animal unknown. 



Type in my collection. 



Hab. Near the Snares, in 50 fathoms (type) ; and Queen Char- 

 lotte Sound, in 16 fathoms (Captain Bollons). 



30. Rissoa vulgaris, Webster, 1905. Plate 13, fig. 5. 



Rissoa. vulgaris, Webster, T.N.Z.I.. xxxvii. 1904 (1905), 277, ]1. 9, f. 3. 



Shell minute, oval, rather solid, rimate, smooth, and somewhat 

 shining. Sculpture consisting of fine oblique growth-lines. Colour 

 pale horny. Spire short, conical, of about the same height as the 

 aperture ; outlines slightly convex. Protoconch small, smooth, and 

 polished. Whorls 4J, first slowly, then more rapidly increasing, 

 moderately convex, the last subangled for a short distance in front 

 of the suture ; base rounded. Suture deep, slightly channelled. Aper- 

 ture oblique, semilunar, angled above. Peristome discontinuous, slightly 

 thickened, sharp, somewhat expanded at the base. ColumeUa very 

 short, arcuate, rounded. Inner lip veiy little produced over the 

 narrow umbilical chink, spreading as a distinct white callosity over 

 the parietal wall. Operculum unknown. 



Diameter, 1-25 mm. ; height, 2mm. (type). Diameter, 1-7 mm. ; 

 height, 2-3 mm. (specimen in my collection). 



Animal unknown. 



Type in Mr. W. H. Webster's collection. 



Hab. Waipipi, Manukau, type (W. H. Webster). 



Remark. The type specimen has the last whorl much more flattened 

 at the periphery. The description and figure are after a specimen 

 obtained from Mr. Webster. 



