72 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



BELLEFONTIA COLLIEANA (Raymond) Ulrich 



Plate 23, figs. 1-6 

 Asaphns marginalis Collie (not Hall), 1903, Bull. Geol. Soc. Amer., Vol. 14, 



p. 413. (Listed only.) 

 Hemigyraspis collieana Raymond, 1910, Annals Carnegie Mus., Vol. 7, No. i, 



p. 41, pi. 14, figs. 9-13. 

 Bellefontia collieana (Raymond) Ulrich, in Walcott, 1924, Smithsonian 



Misc. Coll., Vol. 75, No. 2, p. 54, pi. 9, fig. 3. 

 Raymond's description of the species is as follows : 

 " Cephalon short and wide, glabella smooth, not outlined, no gla- 

 bellar furrows. Neck-furrow shallow, hardly visible. Eyes nearly 

 halfway to the front of the cephalon, large, very far apart. Between 

 the eyes is a small median tubercle. Free cheeks short, wide, with 

 long narrow spines at the genal angles. Facial suture entirely intra- 

 marginal. There is a narrow depressed border on the front of the 

 cranidium. 



Fig. 12. — Bellefontia collieana (Raymond). 

 Corrected drawing of the genotype. 



" Axial lobe of thorax one-third the total width ; pleura grooved. 

 Pygidium short, wide, semi-circular in outline. Axial lobe narrow, 

 rather prominent, showing traces of two or three rings. Pleural lobes 

 convex, without traces of ribs. Border narrow, concave; doublure 

 narrow, convex." 



It is to be noted that Raymond places the eyes too far forward in 

 his illustrations. 



Formation and locality. — Canadian: (27ir) Lower Stonehenge. 

 Bellefonte, Pennsylvania. 



BELLEFONTIA NONIUS (Walcott) 



Plate 23, figs. 7-1 1 



Niohe ? nonius Walcott, 1923, Smithsonian Misc. Coll., Vol. 67, No. 8, 

 p. 473. (Listed under locality 65y.) 



This species averages larger in size than B. collieana. In the cra- 

 nidiuin the greatest difference between the two species lies in the 



