1 382.] Geology and Palceontolcgy. 605 



sisting of a wide band on t 

 embraces more of the circ 

 where. Apex grooved belli 



If this be an inferior canine tooth it differs from that of the 

 Tillodonta in its large size and incisor-like form. It most resem- 

 bles the external or third inferior incisor of Calamodon. From 

 this it differs in the scalpriform wear, and the oval instead of tri- 

 angular section, and in the absence of cementum layer. 



Char. Specif. — The enamel band does not cover the entire 

 width of the external face, but leaves exposed a part of the dental 

 surface anterior and posterior to it except at the apex. At the 

 latter point there are seven coarse shallow grooves of the enamel 

 surface; the posterior of these split up below, and become nar- 

 rowed, while the anterior run out at the more curved anterior 

 edge of the enamel band. The posterior apical groove has a flat 

 bottom. At the front of the apex the enamel is involute to the 

 inner side for a short distance. The inner face of the tooth dis- 

 plays five facet-like bands of the dentinal surface, which soon dis- 

 appear inferiorly. 



Measurements. — Length of tooth (root restored) .058; length 

 of enamel band .031; width of enamel band at middle .0095 ; 

 diameters of middle of tooth, anteroposterior .0130, transverse 

 ■009 long; diameter of apex of tooth .008. 



This tooth indicates a new and interesting type, perhaps of 

 Calamodontidte, and one of which more information will be 

 awaited with interest. Judging from the size of the tooth its pos- 

 sessor was a, large as a sheep. From the Puerco Eocene of New 

 Mexico, from D. Baldwin. 



Geological News.— The Philosophical Transactions of the 

 Royal Society of London, 18S0, contains Part x of Professor W. 

 C. Williamson's researches into the organization of the fossil 

 plants of the coal measures. The memoir is illustrated bv eight 

 Plates. Certain small oh ,N u th ;»■ c- ^ oir. from the 

 coal measures have been described as radiolanan, but Professors 

 Haeckel and Strasburger ennem with the writer in believing 

 them vegetable. There is strong cause for the belief that they 



>nncipal of these horns cKic^p >:id with those of the 

 Australian lizard, Moloch 'ior,idus,hw\. the horn-cones 

 are formed of fibrous corium, without bone-deposits. 

 is I foot ioij inches wide. The premaxiH.iries are 



