Publications . Plate 4 All figures aiiproximately uatinal size Figure 1.—Triffojiia jacksonensis, n. sp. Tyjie specimen. Upper Cretaceous,Cliico group from Jacksonville, Oregon. Figure 2.—Trigonia Whiteaves. Reproduction of the original figureof the type. Middle Jurassic, Yakoun formation of Alliford Bay,Queen Charlotte Islands, B. C. Figure 3.—Trigonia pandicosta Meek. Eeproduction of tlie original figure ofthe type. Jurassic, Genesse Valley, Plumas County, California. Figure 4.—Trigonia tryoniana Gabb. Reproduction of the type Cretaceous, Chico group of Tuscan Springs

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Publications . Plate 4 All figures aiiproximately uatinal size Figure 1.—Triffojiia jacksonensis, n. sp. Tyjie specimen. Upper Cretaceous,Cliico group from Jacksonville, Oregon. Figure 2.—Trigonia Whiteaves. Reproduction of the original figureof the type. Middle Jurassic, Yakoun formation of Alliford Bay,Queen Charlotte Islands, B. C. Figure 3.—Trigonia pandicosta Meek. Eeproduction of tlie original figure ofthe type. Jurassic, Genesse Valley, Plumas County, California. Figure 4.—Trigonia tryoniana Gabb. Reproduction of the type Cretaceous, Chico group of Tuscan Springs, Tehama County,California. [44 4.

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Keywords: ., bo, bookcentury1900, bookdecade1920, bookpublishernp, bookyear1921