(6 Scientific Intelligenc 



olar of Mastodon giganteus. This tooth was found by a 

 enty feet below 

 le of the tribiit 



face, while digging for gold f 

 the Cosurnnes River near Di 

 L900f 



is interesting as showing the geographical range of the Mastodon to have 

 been coextensive with the continent and not limited as some Lave sup- 

 posed to the eastern slope of the Rocky Mountains. 



3. New species of Silurian fossils ; by E. Billings, F.G.S., Palaontol- 

 ogist G. S. Canada. Montreal, 6th June, 1862. pp. 67-168, 8vo.— T . ^ 

 is a continuation of the papers formerly noticed (this Journal, [2], >a 

 136, 279) and contains descriptions of' one hundred and six new sj - 

 of fossils from the Silurian rocks of Canada with reraaiks upon ^ ; 

 previously published. The new genera proposed are (l) Licropih - 

 for a group of fucoids ; (2) Shl'Mardia, a genus of minute trilobites allied 

 to Agnostus; (3) Endymion for a genus of trilobites allied to both 

 Ampyae and Trinucleus and apparently standing between these two 

 genera; (4) Trimerella, consisting of large brachiopods with three lon- 

 gitudinal septa in each valve supporting a flat or concave plate to which 

 a portion of the muscular apparatus was attached, the beak solid and tha 

 area transversely striated as in the genus Obolus. About ninety of the 

 species are figured. 



4. True position of the so-called Waukesha Li^nestone of Wisconsin. (In 

 a letter from Dr. C.'Rominga, of Ann Arbor.)— In the local description of 

 the Silurian strata exposed in the neighborhood of Milwaukee, a certain 

 calcareous stratum or a complex of such is called Waukesha limestonf, 

 and was considered as being the base of the thick bedded fossiliferow 

 lime rocks, considered as synchronic with the Niagara limestones. 



A careful examination proves beyond all doubt, that the Wankesb* 

 limestone is in reality the superincumbent rock, and that the Nifigsra 



like knobs through the otherwise nearly horizontal or merely undulating 

 strata of the Waukesha limestone. 



5. Note on the Description of Lingula poUta. — We have receiv. 

 following statement called out by a charge made in the pap^r 

 Billings, in the last volume of this Journal, page 420. — Eds. 



Albany, May i: 



I certify that on the ninth day of February, 1861, I sent to • 



James Anderson, at that time of the Cunard Steam Ship "Cm 



from Trempaleon, Wisconsin, containing small Linguloid shell-, _ 

 me by Prof. James Hall, under the name Lingula polita; whu . 

 was written upon the labels sent with the specimens. 



Without being able to designate the precise time, I know of my o^ '' 

 knowledge, that at a time previous to the date specified above (9th ot 

 February 1861), Prof. Hall had made comparisons of this small fossi^ 

 with the figures and descriptions of Dr. D. D. Owen ; who had designated 

 it as Obolus apolinus? and that its relation to Obolus and its differences 

 therefrom, as exhibited in figures given by Davidson, were fully discusse*i 

 by Prof. Hall and myself. 



[Signed] R. P. Whitfi2I.i>. 



