504 GASTROPODA. [Pectinibranchia. 



axial riblet ; sinus close to the suture, broad and shallow. Columella 

 vertical, concave towards the parietal wall, slightly twisted, and drawn 

 out to a narrow ridge towards the margin of the canal. Inner lip 

 very thin, narrow, smooth, spread over the flat parietal wall. 



Diameter, 2-1 mm. ; height, 44 mm. 



Animal unknown. 



Type in my collection. 



Hob. Near the Snares, in 50 fathoms (Captain Bollons). 



Remark. Allied to M. murrhea and infanda, Webst., both of 

 which, however, have a spirally striate base and a short straight canal. 



12. Mangilia Sinclairi, E. A. Smith, 1884. Plate 22, fig. 7. 



Pleurotoma (Mangilia) Sinclairi, E. A. Smith, A.M.N.H. (5), xiv, 1884, 

 320. Mangilia Sinclairi, Suter, J. Mai., xii, 73. Clathurella Sinclairi, 

 Smith: Button, P.L.S. N.S.W., x, 118; Suter, T.N.Z.I., xxxi, 73; 

 Tryon, Man. Conch. (1), vi, 283, pi. 34, f. 91 ; Index, 71. Daphnellc 

 (Mangelia) Letourneuxiana, Crosse : Hutton, C.M.M., 12 ; not oi 

 Crosse. Defrancia luteo-fasciata, Reeve : Hutton, J. de Conch., xxvi, 

 17 ; M.N.Z.M., 45, not of Reeve. 



Shell small, ovate, subturriculated, solid, axially costate and 

 spirally lirate, usually with 2 brown spiral bands. Sculpture consist- 

 ing of rounded and rather low axial ribs, 10 to 16 on the last whorl, 

 the interstices of about the same width as the ribs, which are mostly 

 obsolete on the very narrow shoulder or depression of the lower whorls, 

 continued nearly to the base ; they are crossed by more or less distinct 

 spiral lirae, continuous between and across the ribs, stouter upon the 

 neck of the canal. Colour light flavescent, with 2 reddish or brown 

 intercostal bands at the suture, the lower of them generally becoming 

 very broad on the body-whorl, and extending to the margin of the 

 flattish fascicle below ; very often these bands are absent, or the 

 apex and the fasciole only are brown. Spire conic, scalar, somewhat 

 higher than the aperture. Protoconch smooth, with a flatly rounded 

 nucleus. Whorls 8, the earlier ones flattish, the others convex, with 

 a narrow shoulder or depression ; base contracted. Suture impressed, 

 undulating. Aperture oblique, narrowly ovate, angled above, pro- 

 duced below into a short broad canal, slightly oblique and not emar- 

 ginate at the base. Outer lip strengthened by the last rib, flatly 

 convex, sharp, with a shallow rounded sinus a little below the suture. 

 Columella faintly arcuate, vertical, drawn out to a narrow ridge to- 

 wards the canal. Inner lip smooth, thin, and narrow. 



Diameter, 4-5 mm. ; height, 11 mm. 



Animal unknown. 



Type in the British Museum. 



Hob. Throughout New Zealand and at the Chatham Islands. 



Remark. This is a very variable shell, its height varying from 

 6 mm. to 13 mm., and the number of ribs from 10 to 16. 



Fossil in the Pliocene. 



