N0.1458. CAMBRTAN FAUNAS OF CHINA—WALCOTr. 587 



pits occur in the furrow, one strong one on each side of the center, 

 and one faint one opposite the outer edges of the glabella. 



Surface finely granulose under a strong lens. The largest head has 

 a length of 5 mm. 



Ohnervatlons. — This species belongs to the forms intermediate 

 between Ptychoparia and Llo.stracust. It is distinguished from other 

 species of the Chinese Cambrian by its rounded, strong frontal rim, 

 and very slightly tapering glal)ella, in the latter respect recalling such 

 forms of AnomocKve as .1. liitc!< Walcott/' .4. alelnoe Walcott,'' and 

 A. minus Dames,'' from the Cambrian of Cliina. 



Formation and loe<iI!ty. — iVIiddle Cambrian, oolitic limestone; 4 

 miles south-southwest of Tung-yii-chon, Shen-si, China. 



Collected by Eliot Blackwelder. 



PTYCHOPARIA INFLATA, new species. 



This species is represented by two specimens of the central portions 

 of the head, exclusive of the free cheeks. The parts preserved indi- 

 cate that the head was rather strongh' convex, and semicircular in 

 outline. Glabella moderately convex, with the length and width at 

 the base equal; the sides converge slightly toward the rather broadly 

 rounded antero-lateral angles; front nearl}" transverse; surface marked 

 b}' a clearl}^ defined posterior pair of furrows, which extend obliquely 

 inward and backward, separating a subtriangular postero-lateral lobe; 

 a second pair of short, lightly defined furrows occurs about one-third 

 the distance between the posterior furrows and the front of the glabella; 

 occipital furrow rather broad and shallow toward the center, narrower 

 and deeper at the sides; occipital ring narrow at the sides, increasing 

 in width toward the center where it is rather broad, and slightly 

 convex; dorsal furrow clearly defined at the sides and front of the 

 glabella. 



Fixed cheeks about one-third the width of the glabella, convex, 

 rising from the dorsal furrow and curving over to the facial sutures 

 and the furrows separating them from the palpebral lobes; palpebral 

 lobes narrow, slightly elevated, and about one-third the length of the 

 head; ocular ridges indicated more b}' the depressions in front of them 

 than b}^ their elevation above the general surface of the fixed cheeks; 

 postero-lateral limb short, and marked by a broad, shallow furrow 

 within the strong, rounded posterior rim; frontal limb convex, inflated 

 at the center so as to form an elongate swelling somewhat similar to 

 that of Agraulos{f) melie (p. 581); the line of demarcation between the 

 fixed cheeks and the frontal limb is rather indefinite, the fixed cheeks 

 merging into the downward sloping surface of the frontal limVj; there 

 is no line of demarcation to indicate a distinct frontal rim. 



«'Proc. U. S. Nat. Mus., XXIX, 1905, p. 49. 



^Idem, p. 47. 



c China, Richthofen, IV, 1883, p. 15. 



