NO. HIS. C.l.l//.'/.7.LV FAlhYA^^OFCHINA—WALCOTT. 67 



torior miii'iiin, and aiilcrioily to the front iiiai-i.;iii; palpcl)!!!! lohos 

 situated about uiidwav hetwe(Mi the front and the postcu'ior margins of 

 the head, small and short, not nuu-h over one-tifth tlu^ leiioth of the 

 iiead; frontal riiu narrow , wire-like, and separated from the olaludla 

 and fixed cheeks by a rounded furrow of moderate depth. 



The crust is rather thick, the outer surface marked by scattei-ed 

 shallow puncta", with vei'v line puncta% as shown by a stron*;- lens, 

 l)(4ween them. Length of head exclusive of occipital rino-, 7.5 nun. 



'Phis species is closely related to PdijoiVKt lotos. It dill'ers in the 

 form of th(^ frontal rim and the more uniform sloyie of the >;latHdla 

 toward the front. From /*. />/</ it differs in the more rapid downward 

 slope of the front of the o-hi])ella and in the parallel or slightly con- 

 tracting- sides of the o-lal)ella. 



ForiiKitJoii tnxl local Ity. — Upper Cam))rian, lower portion of Cdiao 

 Mi Tien formation, in g'ray fossiliferous limestone; Chao Mi Tien, 

 Shano-tuno-, China. 



Collected by Kliot Hlackwelder, of the Carneoi(> Institution of 

 Washinj^ton Expedition to China. 



Genus PTE ROCEPH A LUS T^oemer. 

 PTEROCEPHALUS ASIATICA, new species. 



This species is represiMitcd by fi'a^inents of the anterior ])oiti()n of 

 the head and of the [ni^idium. (Jlabella truncato-conical, moderately 

 con\ex, narrowing gradually toward its rounded front; surface marked 

 bv three j)airs of short fui'rows, the posterior of which sepai'ate ratluM- 

 small oval lobes at the postero-lateral ano-|es; occipital furrow nan-ow 

 and slightly impi'essed; occi})ital riny- of medium width and nearly 

 flat; dorsal furrow nai-row, but distinctly mai'ked. 



Fixed cheeks about two-thirds the wddth of the ohibtdla opposite 

 the pali)ebral lobes, sliohdy con\ex, and crossed l)y strono-, low, ocular 

 rido-es; postero latei'al limbs unknt)wn; frontal limb very broad and 

 sliohtly concave: just in fi-ontof the olji))ella there is a faint depression, 

 formed by a slioht chan^'e in the slope of the frontal liud), that (>xt(Mids 

 across a short distance in front of the palpebral lobe; fi'ontal rim 

 narrow, slightly rounded, and marked l>y irre_i»ulai- stria' i)arallel to 

 the margin. 



Surface of the o-labella and fixed cheeks slightly roughened by 

 what appear, under a strong' lens, to be very fine granulations; the 

 frontal limb is marked by irregular, raised lines that radiate from 

 the front of the glabella and ocular ridges outward toward the front 

 margin; these raised lines are very irregular and more oi- less inoscu- 

 lating on and near the transverse depression of the frontal limb in 

 front of the glalxdla and ocular ridges. On a head 23 mm. in length 

 the frontal limb has u length of 1 1..5 nun. and the glabella and occipital 

 ring 11.5 mm., with a width at the palpebral lobes of 18 mm. 



