826 Transactions.— Geology. 
Mitra inconspicua, 
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. grenlandica, Gray, but narrower anteriorly. 
Turricula lincta. 
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, the anterior one being very 
small. 
Length, :2 inch. 
Locality. Petane. 
Siphonalia orbita. 
Shell fusiform, spire produced, acute. Whorls 8, the first 24 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 River. 
Of the same shape as P. lineata. It is more strongly spirally marked 
than P. striata and less so than P. drewii ; the latter having only about 6 or 
7 spiral ribs on the penultimate whorl above the mouth. 
