38 The American Naturalist. [January, . 
England. The fossil is described and figured in the Quart. Jour. 
Geol. Soc. May, 1892, under the name Lepidodiscus milleri, by 
G. Sharman and E. T. Newton. Mr. H. G. Seeley describes a new 
reptile from Welte Vreden, Cape Colony, Eunotosawrus africanus. 
The dorsal vertebræ in form and number suggest the Chelonian type, 
but the specimen affords no proof that the whole of the dorsal verte- 
bre are preserved. Every character preserved differs from those of 
South African fossils hitherto known, with the exception of the pubis, 
which suggests that the specimen is referable to the Mesosauria in a 
division distinct from the Proganosauria—Quart. Jour. Geol. Soc., 
Nov., 1892.——Eleven new species of Lower Silurian Ostracoda refer- 
able to the two genera Leperditia and Schmidtella are described and 
figured by E. O. Ulrich in the Amer. Geol., Nov., 1892. 
Mesozoic.—Mr. Arthur Hollick calls attention to some fossil mol- 
lusesfound at Tottenville and Arrochar, Long Island. Prof. Whitman 
has determined them to be marine cretaceous species. These, in con- 
nection with cretaceous plants found in the same locality, establishes 
the cretaceous strata which have hitherto been assumed to extend 
along the southern and western shores of Long Island.—Trans. New 
York Acad. Sci., 1892, p. 96. A new Mosasaur, Clidastes westii, is 
described by Mr. Williston. The fossil was found in the uppermost of 
the Niobrara beds, and consists of a complete lower jaw, quadrate, 
portions of the skull, the larger part of the vertebral column, and the 
incomplete hind and fore paddle. It is estimated that the animal in 
life measured seventeen and one-half feet.—Kansas Univ. Quart., July, 
1892. Mr. Ubler’s observations show three structural units in the 
Tuscaloosa formation instead of the one insisted upon by McGee and 
Darton. His division is as follows: 1 The Potomac formation prope? 
laid down on the broken border of the crystalline rocks and capped — 
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by the variegated clay. 2 "The Albirupean formation, which includes 
the series of clays, sands and cobble-stone deposits resting between the 
variegated clay and the base of the Severn formation. 3 Alternate 
clay sands resting upon the irregular and eroded surface of the white 
1892. 
Cenozoic.—The collection of fossil marsupials at Queensland 
includes a fine series of mandibles of Phascolomys mitchellii, which sup” , 
_ port Mr. De Vis in making this a distinct species from P. platyrhinvs- 
—Proceeds. Linn. Soc. N. S. W., 1891——Two species, Laganum 
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clay or sand of the preceding group.—Trans. Maryland Acad. Sci, a 
