<iv) 58 



Palxontologia Sinica 



Ser. B. 



ChUANGIA BATIA Walcott 

 Plate IV, Figs. 4 a-e. 

 1905 Plychoparia? batia walcott, Proc. U. 8- Nat- Mus., Vol. XXIX, p. 75. 



1911 Chuangia batia walcott, Smithsonian Misc. Coll., Vol. S7, No. 4, p. 84, pi. 15, figs- 3, 3 a. (Refer- 

 red and figured as genotype of new genus Chuangia) . 

 1913 Chuangia batia walcott, Eesearch in China, Vo!. Ill pp. 170-171, plate 17, figs. 20, 20 a-d. 



Cephalon, exclusive of the free cheek, subrhomboidal, moderately convex. 

 Glabella truncato-conical ; marked by three pairs of glabellar furrows very faintly shown; 

 the posterior pair shallow, broad and slightly impressed extending from the dorsal furrow 

 backward and inward; only faint traces of the broad second and anterior pairs of glabel- 

 lar furrows are shown ; occipital furrow nearly straight, rounded and very shallow; occi- 

 pital ring strong, very slightly convex and slightly wider at the center than at the ends 

 and marked hj a minute node at the center near the occipital furrow; median longitudi- 

 nal ridge distinct from the frontal margin of the glabella to the occipital furrow, dorsal 

 furrow distinct but not strongly marked. 



Fixed cheeks slightly convex, about one half the width of the glabella at the pal- 

 pebral lobe, and curved downward in front to the frontal rim and backward in the furrow 

 within the posterior margin ; palpebral ridges distinct from the anterior part of the palpe- 

 bral lobe to the dorsal furrow opposite the first pair or anterior glabellar furrows. Palpe- 

 bral lobe small, and situated a little back of a transverse line drawn through the center of 

 the cephalon; anterior lateral angle of the cranidium regularly rounded. 



The facial suture converges on both sides from the anterior margin doAvn to the 

 anterior part of the eye, curves around the lobe and finally decends obliquely outward to 

 the posterior corner. 



The frontal margin of the cranidium forms a regular low arc, and is strongly bent 

 up forming a high rim. Postero-lateral limb large, and marked hy a strong and broad 

 furrow within the elevated posterior margin. The front of the glabella and of the fixed 

 cheeks curves down into a shallow furrow, from which the frontal rim rises before curving 

 over to form a thick frontal margin. 



An associated hypostoma, 9 mm. wide and ] 1 mm. long, is probably of this species. 

 Shell strongly marked by fine pustules. 



4c 4d 



8.7 mm. 13.5 mm. 

 8.0 mm. 12.5 mm. 

 12.6 mm. — 

 6.0 mm. 9.0 mm. 

 4.5 mm. 7.0 mm. 



