ALASKA GEOLOGY 
II 4 
Cardium decoratum Grewingk. 
Cardium decoratum Grewingk, Beitr. NW. Am., p. 274, pi. iv, figs. 3a-3g, 
1850. 
Localities .— Miocene of Unga Island; Kadiak Island at Ugak or 
Igatskoi Bay, Tonki Cape; and Pavlof Bay, Alaska Peninsula; 
Pliocene of St. Paul Island, Bering Sea (Grewingk) ; Pleistocene of 
Douglas Island, Alaska (Dali), and Vancouver Island, British Colum¬ 
bia (Newcombe). 
Serripes gronlandicus Gmelin. 
Cardiumgronlandium (Chemnitz) Grewingk, Beitr. NW. Am., p. 277, pi. 
iv, figs. 4a-4b, 1850. 
Localities . — Miocene of Unga Island; Kadiak Island (Grewingk) ; 
Pleistocene of St. Paul Island, Bering Sea; recent in the Arctic and 
boreal seas. 
Papyridea harrimani sp. nov. 
Pl. X, fig. 5. 
Shell inflated, large, ovate, gaping behind, the anterior end slightly 
shorter; sculpture of more than thirty-five slender radial ribs, dis¬ 
tributed toward the middle of the disk, flattish, with low, transverse 
nodulations distributed in a generally concentric manner, the inter¬ 
spaces of the ribs finely transversely striated; at the anterior end the 
ribs become feebler and more slender, being hardly perceptible on the 
cast; near the posterior end they appear to cease abruptly, leaving a 
posterior area over which the sculpture is obsolete; valves rounded in 
front, arcuate below, moderately inflated; beaks low. Length of shell 
about 45, height 38, diameter about 25 mm. 
Locality . — Popof Island, 3372. 
This fine large species has no analogue in the recent fauna. Though 
an internal cast, there are some small bits of the shell adhering which 
give data for the external sculpture. It is named in honor of Mr. E. 
H. Harriman, patron of the Expedition. 
Diplodonta sp. 
Locality . — Popof Island, 3372. 
Casts of a rounded Diplodonta , 25 mm. long and 24 mm. high, 
with a diameter of about 20 mm., were obtained. They appear to 
have had a thin concentrically striated shell, with low beaks, smooth 
margins, and the muscular scars of the typical Diplodonta. This 
may be identical with the Sphcerella oregona Conrad mentioned in 
the Smithsonian checklist of Eocene fossils, p. 6, 1866, but of which 
I have so far been unable to find a published description. 
