NEOZOIC INVERTEBRATES III 



embedded in a very tough matrix that the characters are not all deter- 

 minable, but it should be recognizable from those above enumerated. 

 It recalls the recent species of the same region, like M. pupilla 

 Gould, though less elaborately sculptured. 



Dentalium sp. 



Locality. Upper beds, 3374. 



A large species of Dentalium occurs in these beds, rounded at the 

 upper part with transverse feeble striation, the more slender portion 

 behind smooth and obscurely six-sided, an appearance which may be 

 due to pressure. It reaches a length of at least 70 mm., and a diam- 

 eter near the aperture of 5 mm. 



The total Eocene fauna of the Stepovak Series above 

 described thus comprises at least thirty-four species, and 

 it is probable that by continued and systematic collecting 

 a very much larger number might be obtained. 



II. MIOCENE FOSSILS FROM THE SHUMAGIN ISLANDS 



In 1865, 1872, and other later dates the writer collected 

 specimens from the Crepidula bed over the leaf beds in 

 the northwestern peninsula of Unga Island, Shumagins. 

 Collections were also made in 1874 on the north shore of 

 Popof Island, between Popof Strait and Pirate Cove. 

 During the stay of the Harriman Expedition at Humboldt 

 Harbor, Sand Point, Popof Island, Mr. Trevor Kincaid 

 also collected from the Popof Island beds. The number 

 of species being small, I have combined them in one list. 

 The locality numbers are as follows : * 



2103. Coal Bluff, Unga Island, Miocene horizon above 

 the leaf beds, collected by Dall in 1865, 1872 and 1880. 



3563. Miocene stratum, same horizon as the preceding, 

 collected by Dall in 1874 and 1880, north shore of Popof 

 Island. 



3372. Same horizon, north shore of Popof Island, col- 



'The collections are in the U. S. National Museum, Washington, D. C. 



