458 Transactions. — Geology. 



Art. LXXIII. — Descrq^tion of three new Tertiary Shells, in the Otago 

 Miiseum. By Capt. F. W. Hutton, RG.S., C.M.Z.S. 



Plate XXI. 



\_Read before the Otago Institute, \2th October, 1874.] 



Cominella striata, sp. no v. 



Fusiform; spire acute, produced. Whorls six or seven, convex, with 

 small spii'al ribs, and finely spirally striated between the ribs ; upper whorls of 

 the spire transversely ribbed ; body whorl moderate. Columella with a few 

 small teeth at the anterior end ; aperture ovate ; outer lip grooved inside j 

 canal rather long, turned slightly backward, and notched. Length, 1-15; 

 breadth, -G. 



Locality. — Wanganui, in blue clay. 



Presented to the Museum by W. T. L. Travers, Esq., F.L.S. 



Zizyphinus hodgei, sp. no v. 



Thin ; whorls flattened, suture obscure ; outline of spire concave. "Whorls 

 angled with fine spiral moniliform lines, of which there are about five on the 

 body whorl in front of the aperture from the suture to the keel. Columella 

 with a small callosity over the umbilicus. Length, '85 ; breadth, -95. 



Locality. — "Wanganui, in blue clay. 



Presented to the Museum by M. V. Hodge, Esq. 



Venus (?) sulcata, sp. nov. 



Ovate, sub equilateral, rounded in front and obliquely truncated behind. 

 Umbones slightly turned forward. Shell deeply and broadly concentrically 

 grooved. Height, 1*9; length, 2-4. 



Locality. — Napier, in limestone. 



Presented to the Museum by Captain Hutton, F.G.S. 



Art. LXXIV. — Notes on the Microscopic Structure of certain Igneous Rocks 

 submitted by the Director of the Geological Survey of New Zealand.^ 

 By Richard Daintree, F.G.S., Agent-General for Queensland. Com- 

 municated by Dr. Hector. 



[Read be/ore the Wellington Philosophical Society, Sth August, 1874.] 



Dolerites. 

 No. 2076. — (Selwyn River.) Altered dolerite. The constituents are plagio- 

 clase, augite, magnetite, and pseudomorphs after olivine. The large brown 



• These minerals were collected by Dr. Ilaast. The composition of several of them 

 is given in the Seventh Annual lieport on the Colonial Laboratory, 1872, p. 17. 



