1892.] Geology and Paleontology. 51 



would be in making a similar disposition of the lowest beds at Cincin- 

 nati. This is contrary to opinions hitherto held, as they have been 

 generally referred to the Trenton. Mr. James considers them part of 

 the series known as the Cincinnati group of Meek and Worthen, f„r 

 which Walcott has proposed the name Cincinnati Shale and Lime- 

 stone in the Hudson Terrane. Mr. James remarks, in this connection, 

 that there is no good reason to say that the Trenton outcrops at the 

 surface in any locality within the borders of Ohio. (Journ. Cin. Soc. 

 Nat. Hist, July, 1891.) 



Mesozoic— M. Philippe Thomas report- valuable deposits of phos- 

 phate of lime in the cretaceous marls of Tunis. The most important 

 are located in the southwestern part of the high plateaus. (Rev. Set., 



Nov., 1891.) The left ramus of a mandible of Homoeomurus major 



was exhibited by Mr. Boulenger at a recent meeting of the London 

 Zool. Soc. The specimen was taken from the Forest Marble in Wilt- 

 shire. (Proceed. London Zool. Soc, Feb., 1891.) A recent paper 



by Mr. Lydekker, on L rtrta concludes as follows : 



"It appears from the recent researches of Dr. E. Fraas that the 

 type of i". acutirostris Owen has smooth, carinated teeth like those of 

 I. plaiydon, so that this species should be transferred to the Platyodont 

 group, which it has been* proposed to raise to generic rank as Temno- 

 dontosaurus. This leaves the name I. quadriscissus as the one best 

 applicable to the other specimens catalogued as I. acutirostris. More- 

 over, Dr. Fraas considers that /. zetlandicus Seeley is identical with 

 quadriscissus ; and we are disposed to doubt the right of separating /. 

 longirostris Jtiger (non Owen) from the same. Finally, we observe 

 with satisfaction that Dr. Fraas is disposed to consider the American 

 Baptanodon as inseparable from Opth<ihnos<nrni« of the English 

 Oxford and Kimmeridge Clays, of which such a fine series has been 

 recently acquired by the British museum." (Geol. Mag., July, 1891.) 



Cenozoic. — Mr. Crawford has collected a series of tacts which indi- 

 cate that at least two or three mountain ranges in Nicaragua were 

 deeply covered by ice during a glacial epoch contemporaneous with 

 that which existed in the North American continent. (Am. Geol. 

 Nov., 1891.)— According to R. E. Call the silicified woods of Eastern 

 Arkansas are all of Tertiary age. They are silicified lignite, derived 

 from the beds of Eocene clays that underlie the sands and gravels in 

 which they commonly occur. (Am. Jour. Sci., Nov., 1891.) T. M. Bou- 

 langer has described a new extinct turtle ( Testudo mierotpnpanuni), 



