272 NEW UPPER CAMBRIAN FOSSILS WALCOTT. 



The specific name is giveu from that of the old Iiidiaa chief Osceola. 

 Formation and locality. — Upper portion of Cambriau (Potsdam ter- 

 raue), Osceola Mills, Wiscousiu. Collected by Dr. Cooper Curtice. 

 Kat. Mus. Cat. Invert. Foss., 23853. 



Ptychoparia burnetensis sp. nov. 

 Plate XXI, Fig. 1. 



Head within the facial sutures subquadrangular, exclusive of tlio 

 somewhat ])rolonged posterolateral limbs. 



Glabella convex, truncato-conical ; exclusive of the occipital segment 

 it is less than one-half the length of the head ; glabellar furrows, if pres- 

 ent, have been lost by the destruction of the outer surface of the test ; 

 occipital furrow strongly marked and extended as a deep groove across 

 the posterolateral limbs ; occipital segment narrow and arching a little 

 backward. Fixed cheeks narrow; palpebral lobes small ; frontal lobe 

 about one-sixth the length of the head and separated fiom the strong, 

 somewhat elevated, frontal rim by a broad, rounded groove. The asso- 

 ciated free cheek terminates in a short postero-lateral spine. 



Formation and locality. — Upper Cambrian (Potsdam) Sandstone. 

 " Tatur Hill," Burnet County, Texas. Collector, C. D. W. 



Nnf. Mns. Ciit. Tnvort. Foss,, 23854. 



Ptychoparia connata sp. nov. 

 Plate XX, Fig. 2. 



Of this species only the central portions of the head are now known. 

 The glabella is truncato-conical, moderately convex, and marked by 

 three pairs of slightly indented glabellar furrows. Occipita' furrow 

 narrow and arching forward at the center ; occipital segment of medium 

 width and slight convexity. Free cheeks, narrow ; p.d[)ebral lobes 

 about one third of the length of the head. Frontal limb narrow, and 

 separated from the strong, rounded frontal rim by a broad shallow 

 groove. 



What we have of this species may be compared with Ptychoparia 

 oweni^ M. & H., P. ivisconsensis, and P. {(J.) iowensis, Hall. It differs in 

 the strong frontal rim and groove in front of the glabella. 



Formation and locality. — Upper Cambrian (Potsdam) sandstone, Eau 

 Claire, Wis. Collector, Dr. Cooper Curtice. 



Nat. iMus. Cat. Invert. Foss., 23855.' 



Ptychoparia llauoensis sp. uov. 

 Plate XXI, Figs. 3, 4, and 5. 



Of this species there has been found the head, including the free 

 cheeks, and the pygidium. 



Glabella truncato-conical, the front broadly rounded ; market^ by 

 three pairs of furrows that indent the surfiice from just within the mar* 



