46 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



Fixed cheeks a little more than half the width of the glabella, rising 

 rapidl}^ from the facial suture and merging into the frontal limb 

 anteriorly and into the short postero-lateral limbs at the back; palpe- 

 bral lobes small and narrow; ocular ridges broad but faintl,y defined; 

 the}" extend from the antero-lateral angle of the glabella outward and 

 slightly backward to where they unite with the palpebral lobe; frontal 

 limb slightly convex from the front of the glabella to the broadly 

 rounded front margin. 



Surface apparently smooth. The largest specimen in the collection 

 has a length of 9 mm., exclusive of the occipital spine. 



This species strongly suggests Agraulos drenuu.s Billings from the 

 paradoxides zone of Newfoundland; it differs in the form of the frontal 

 limb and border. In A. dolon the frontal limb arches gently down- 

 ward and forward to the margin, while in A. strenuus it is nearly flat 

 and slightly convex between the glabella and the margin. The glabella 

 of the latter is also proportionally longer. 



It differs from Agraulos dirce in its greater convexity, more clearly 

 defined glabella, and strong occipital spine. 



Formation and locality.- — Middle Cambrian. Lower portion of 

 Chang Hsia formation near base of oolitic limestone; 2.2 miles south- 

 west of Yen Chuang, Hsin Tai, Shangtung, China. 



Collected by Eliot Blackwelder, Carnegie Institution of Washington 

 Expedition to China. 



AGRAULOS DRYAS, new species. 



Glabella and fixed cheeks convex; rhomboidal in outline. Glabella 

 convex, short, narrowing slightly toward the rounded front, without 

 traces of furrows; occipital furrow broad, very faintly defined; occip- 

 ital ring very narrow at the sides, broadening out rapidl}^ to a blunt 

 point so as to be almost triangular. 



Fixed cheeks about two-thirds the width of the glabella, and sloping 

 slightly downward to the small palpebral lobes which are situated 

 about midway between the posterior and the front margin of the head; 

 back of the palpebral lobe the fixed cheeks slope rapidly to broad, 

 short, postero-lateral limbs; palpebral lobes short; form unknown; 

 ocular ridges not distinguished on the downward slope of the fixed 

 cheeks toward the frontal limb; frontal limb and frontal rim nearly 

 as long as the glabella; ver}^ slightly convex and separated from each 

 other by a shallow, slightl}^ defined depression; dorsal furrow shallow 

 but clearly defined. 



Entire surface marked b}^ numerous, rather strong, punct^; also 

 very fine, almost microscopic, irregular, elevated more or less concen- 

 tric, stria' on the glabella. Length of head 3.5 mm. 



This species is represented by one specimen. It is strongly char- 

 acterized by its punctate surface and general form. 



