410 Transactions. —Geology. 
Description.—Rhombie, in radiating groups, which separate in thin 
flexible lamine. Hardness 2 to 2:5; colour, whitish green to dark green, 
weathering to a bronze hue and pearly lustre. B.B. infusible, but becomes 
white; odour, bitter argillaceous when breathed upon. Allied to picros- 
mine and antigorite. It is from the Dun Mountain, where it occurs with 
the serpentine rocks. It was collected by the late Mr. E. H. Davis. 
Art. XLIX.— Deseriptions of some new T. ertiary Shells from Wanganui. 
By Professor F. W. Hurrton. 
(Read before the Philosophical Institute of Canterbury, Tth September, 1882.] 
A snort time ago a collection of over a hundred species of Mollusea from 
the Wanganui bed was submitted to me for determination by Mr. $8. H. 
Drew, of Wanganui, and in it I found the following forms which appear to 
be undescribed :— 
Trophon expansus, sp. nov. 
Shell ovate ; spire moderate, acute: whorls five or six, spirally grooved, 
the grooves narrower than the ribs, about 26 grooves on the body-whorl, 
crossed by undulating lamine of growth worn smooth. Aperture ovate, 
wide, slightly angled behind ; outer lip expanded ; columella rounded, with 
a small posterior canal: anterior canal very short and recurved. 
Length, ‘77 inch; breadth, :4 inch. Length of spire, :8 ; of aperture, 
*85 ; of canal, *12 inch. 
This is one of the purpuroid Trophons, but with a rounded columella ; 
it is so like the figure of Purpura patens, H. and J., that I should have con- 
sidered it the same, but that the authors state that P. patens has the colu- 
mella very flat. 
Cominella drewi, sp. nov. 
Shell ovate, spire short : whorls six, spirally lirate, about 22 lire on the 
body-whorl ; the spire-whorls finely longitudinally plicate. Aperture ovate, 
the posterior canal well marked: columella obliquely truncated; anterior 
canal well defined. 
Length, *78 inch ; breadth, -45 inch. 
This species is distinguished from all our other species of Cominella, 
except C. ordinalis, Hutton, by being spirally lirate, and from this species 
it is separated by its well-marked anterior eanals, which makes it inter- 
mediate between Cominella and Euthria. 
