326 Transactions. — Geology. 



Mitra inconsjncua. 



Shell fusiform, tapering nearly equally towards both ends from about 

 the middle ; quite smooth. Whorls 6-7, rather flattened, but the suture is 

 well marked. Aperture narrow, produced anteriorly into a short canal, 

 which is very faintly spirally striated ; columella plaits four, subequal and 

 equidistant. 



Length, '65 inch ; breadth, -28 inch. 



Locality. Mount Harris and Waihao greensands. 



Much like M. grcenlandica, Gray, but narrower anteriorly. 

 Turricula Uncta. 



Shell minute, fusiform, broadest in the middle, smooth and shining. 

 Whorls 6, the two first embryonic, the others angled ; those of the spire 

 with numerous small longitudinal nodules, which get smaller and disappear 

 altogether on the body whorl. Suture covered. Posterior portion of the 

 whorls slightly concave. Body whorl spirally striated at the anterior end. 

 Aperture narrow ; columella with four plaits, tbe anterior one being very 

 small. 



Length, ■ 2 inch. 



Locality. Petane. 



Siphonalia orbita. 



Shell fusiform, spire produced, acute. Whorls 8, the first 2|- embryonic, 

 the others with distant strong spiral ribs. Spire whorls shouldered and 

 slightly longitudinally plicated, marked with growth-lines and with 3 or 

 4 spiral ribs ; the space above the shoulder without any spiral ribs, 

 slightly concave, overlapping the suture. Body whorl rounded, with about 

 14 spiral ribs, which are flattened and narrower than the grooves. Aperture 

 oval ; anterior canal moderate, slightly recurved. 



Length, 1*45 inch ; breadth, *75 inch. 



Locality. Greta, Canterbury. 



Like mandarina in shape, but distinguished by the regular distant spiral 

 ribs. 



Pisania media. 



Shell fusiform, spire acute, without longitudinal ribs. Whorls 7, the 

 first two embryonic, polished ; the others finely spirally ribbed ; about 14 

 of these ribs on the penultimate whorl just above the mouth ; suture well 

 marked. Aperture ovate ; canal short. 



Length, 1*0 inch ; breadth, *45 inch* 



Locality. Waikari ; Pareora ; and White Rock Biver. 



Of the same shape as P. lineata. It is more strongly spirally marked 

 than P. striata and less so than P. dreivii ; the latter having only about 6 or 

 7 spiral ribs on the penultimate whorl above the mouth. 



