458 Transactions. — Geology. 



Akt. LXXIII. — Description of three new Tertiary Shells, in the Otago 



Museum. By Capt. F. W. Hutton, F.G.S., C.M.Z.S. 



Plate XXL 



[Read before the Otago Institute, 12th October, 1874.] 



Cominetta striata, sp. no v. 

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



small spiral ribs, and finely spirally striated between the ribs J tipper whorls of 

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

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

 canal rather long, turned slightly backward, and notched. Length, 145; 



breadth, # 6. 



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 



an 



body 

 with 



Columella 



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, 24. 



Locality.- — Napier, in limestone. 



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



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

 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. 



[Bead before the Wellington Philosophical Society, 8th August, 1874.] 



Dolerites. 

 No. 2075. — (Seluoyn River.) Altered dolerite. The constituents are plagio- 

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



* These minerals were collected by Dr. Haast. The composition of several of them 

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



