OjO 



UK. ,1. \V. DAWSON ON IMMU'T TKHHS roNTAININO ANIMAl, 



"•entk' elevation of both tVout iiml liiiul inarj;-ins, but with nu iintcrior ridgf. In 

 iieitlier of thesi; species could any trace of spines he fuund. 



Besides the niynoi>odal reniains, there are a dozen fran'uients that must prohahly 

 be referred to Scnrnioiis. Of some of them there can be no doubt. The remainder 

 are mere liits of iuteii'umeiit sliowin;,' the surface sculpture, but often with no natural 

 borders whatever. In the chararler of the surliice th(>ro is such dillerence iis to 

 indicate more than a siiiLile species. For thouj^'h we should certainly expect to find 

 considerable ditVeriMiccs between the various ])arts of one and the sanu' individual, the 

 diversity here is too i^reat, buth in amount and nature, to rendt>r it at all ]>robable 

 that the dillerence may tairly br explained in s\icli a manner. The better fraifments 

 exhibit ii considerable portion of the stouter part of the body, enough to show its 

 general form at least, and these point also to the ])robable existence of two s[)ecles, 

 of nearly the same siw, but dill'ering in form and sculpture ; the nioi-e fusiform-shai)ed 

 species having a less roiiL;heiud surface than is found in the more parallel-sided form. 

 The latter agrees tolerablv with tin' carbonilt'rous genus found near Mazon, 111., callod 

 Ula-.onia bv Mkkk and Woirnir.x, and certainly belongs to the same grou|) of 

 Scorpions; but in view of the nniark.ible addition to our knowledge of the car- 

 Ixtniferous Sccjrpions in thr [iriiniist.d publication of the ri'searches of Mr. Pkach of 

 the <'-eolo<''ieal survev of Scotland, furtlier study of these remains will best l)e 

 postponed, In the nu-antime, they add another form of strictly land life to those 

 already found in these reuKukaltle repositorios of lb>sils, and perhaps illustrate the 

 utility of the bonv anil linrnv arnmur of the smaller liatrachians of the period, which 

 mav have had to contend with tlioe active and venomous Arachnidans. 



The occurrence of seven species of Millipedes in a few decayed trees in one locality, 

 in connexion with similar discoveries in other |)arls of the world, tends to strengthen 

 the probabilitv of the siig^'esliMU, already made by 1 )r. DawsdX, that the animals of 

 this Tvpe may have culminated in the I'akeozoic period. 



