TKII.ii 



three or even four simple ob-cnre rib-. The of the .IMS \\lm-li is 



-ideral'l v renioM-d from tlir termination df thr -hiei-i. i- also seen to lie faintly 



bilol 



Tlir Uon i.f ' . u-idia with tin' fiirin nf cephalon described i- to .-ome 



ee a matter of pre-umption. though their intiin.iti- i ...... m n the -amc 



rock- and otiiri '\idence.f.i BB me pleMtm to dadkwte tin- 



!o in\ frifii'l. Prof. 1 r. Srhinidt. tin- fuun<k'r of tho 



M.(T (OilliH-linti of ('.inrinii F'iill-, Mum 



I'l ICKI'll M.I - //.(// (SJI.) 



l'i Tk, vol. . i.\v, \\\i*. :t.i i 



Tin' original illn-trat ion- of this species are of themselves in^ulliciiMit to deter- 

 mine its 'litliTi'iitial characti-r-. An examination of tho type ,-perimen- in tho 

 American Museum of Natural History, which iiave l>een kindly placed in my hand- 

 l-y I'rof. I!. 1*. Whittield. has shown that in -tincture of cephalon and pygidinm, /'. 

 cullif-film/iK ditl'i'i- from the form which we have descrilied at length ax /'. < Innidli. 

 mainly in the alismice of genal -pine on the former. 



veen the typical -pocimens referred to and separated heads and tail.- from 



.on. Konntain and Cannon Falls. Minnesota, and county, Kentucky, the 



"f rt'ry<jn,fti>ux caUicephulu* Hall. 



followii,. > of agreement are evident. The cephalon has a short triangular 



anterior projection; genal an-lc- liroad. roiiml and thick, without indication of 

 >pin the occipital . basal glahellar lobes small and 



- punctated beneath the eyes; surface of glabella 



ephnlta I! 



coarsely tubercled. The a\i- of the py^idium ha- iin-urved m. .ui-l -mnoii- 



annulations: of the latter there are from Mo Id; on (lie pleuiM- there are.", dup! 

 rili-. with trace of a -i\th. 



n anil /<-<i/ifj/ 

 Mr. T> :iiatiin t: 



