Mineralogy and Geology. 257 
posing that late investigations had brought to light facts casting doubt 
upon the occurrence of the later types of fossils along any ~— of the 
Hudson river, in other than the little isolated masses alluded to as oceu- 
pying synclinal axes in the older rocks, or entangled amongst their con- 
torted strata. The fact, however, that the more modern types of fossils 
~ it eth! could not now be restricted without much inconvenience, 
he rocks to which it properly belongs, Consequ ently the surest, if 
sk the. only, way to avoid confusion, will be to strike it entirely from our 
nomenclature. The name applied to the more recent roc Mr 
Worthen’s Report on Illinois, is the Cincinnati group, from great 
development and highly fossiliferous character of these beds at the well- 
known city of that name in Ohio 
2. Note on Bellinurus "Dead Ps: the Illinois Np: Bovis epee by 
F. B. Mrex.—In the Proceedin ngs of the Academy of Natural Scien 
of Philadelphia for March, 1865, and again in the Illinois Paleontoogi 
cal bili Mr. Worthen and the writer have described a new 
diff 
e characters assigned it by Portlock, Owen and some others, in having 
its body segments anchylosed, as well as in the position of the ey 
In the Quarterly Journal of the ee Society of London, Nov. 
1865, p. 490, I observe Mr. Henry Woodward, in speaking of the genus 
Bellinurus, says, “the mame of the abdomen, if not anchylosed in all, 
me ae most ” of the s 
the Xiphosura,” he remarked that thie group is “divisible into thes 
genera; Ist. Bellinurus, having 5 freely articulated thoracic segments, 
three anchylosed abdominal ones, and a telson; 2nd. Prestwichia, a new 
* It has been suggested that Prof. Safford’s name, Nashville eo 
retained for this ioteehaits To this I do not seriously object: the only reason 
hot using it is, that Prof, S. applied it to a group including with de scaled 
river rocks, the enton, it 
iently used when we w S oa ision of the later so-called Hudson 
