species. The collection contained about 68 species from four localities, viz., White Rock River; Mount Harris; Point Hill, Waitaki; and from the green sands at Waiho. Of these 22 are additions to our tertiary fauna. The remainder are species already described as found in our tertiary rocks, and from them I judge that the whole collection belongs to the Pareora formation, I am the more confident of this determination as six of the species here described as new are also found in the Pareora formation at Awamoa and other places in Otago. It is worthy of notice that Pecten hochstetteri was in the collection from Waiho, showing that this speciesis not exclusively characteristic of the Oamaru formation.