Description of New Species of Fossils. 131 



PTYCHASPIS Hall, 1863. 



Ptychaspis speciosus Walcott. 



Glabella large, very convex, almost subcylindrical, width a little less than 

 the length, nearly straight in front, the lateral angles rounded, sides straight 

 and nearly parallel ; posterior glabellar furrow extending deeply and obliquely 

 about one-third across the glabella and connected by a straight transverse 

 furrow; the middle glabellar furrow is less deeply impressed and extends 

 across the glabella subparallel to the posterior furrow ; the anterior furrow is 

 indicated by a very obscure line opposite the anterior angle of the palpebral 

 lobe. The occipital furrow is deeply impressed throughout its length. The 

 occipital ring is strong and prominent, but not elevated above the general 

 surface of the glabella. Dorsal furrow deeply excavated at the sides and well 

 defined in front. 



Facial suture, cutting the frontal margin on a line with the outer edge of 

 the palpebral lobe, curves slightly outward, and passes directly to the anterior 

 angle of the palpebral lobe, curving around this it passes obliquely outward 

 to the margin of the posterior limb. 



Fixed cheeks of medium width ; the frontal limb is impressed with a groove 

 midway between the dorsal furrow and its anterior margin ; the posterior 

 limb is subtriangular, with a furrow extending from the dorsal furrow to its 

 lateral margin; the palpebral lobe is large and separated from the fixed 

 cheeks by a deep sigmoid furrow. Surface granulose with waving striae on 

 the central portion of the fixed cheeks opposite the palpebral lobes. 



This species is referred to the genus Ptychaspis from its strongly furrowed 

 subcylindrical glabella and the direction of the facial suture. The largest 

 specimen obtained of the head has a length of six lines, with a breadth of seven 

 lines at the palpebral lobes. 



Formation and locality. Calciferous formation, Saratoga Co., N. Y. 



Bathyuras armatus Billings. 



Mr. Billings described* the type of this species from the Levis formation 

 of the Quebec group. A form closely related occurs in the Calciferous forma- 

 tion of Saratoga county, and may prove to be the same. A comparison with 

 the type will be necessary to separate them, as the specimen figured was in 

 poor condition and not well illustrated, if the description was taken from it. 



The above described species are associated with Stromatopora sp.?, Lingula 

 acuminata, Metoptoma simplex, Murchisonia sp.?, a lamellibranchiate shell, 

 and two forms too imperfect for determination. 



The occurrence of a species of the genus Ptychaspis associated with Con- 

 ocephalites calciferous and C. Hartti — species related to C. Wisconsenensis and 

 C. Iowensis of the Potsdam fauna of Iowa and Wisconsin, relates the fauna 

 of the Calciferous formation of New York with that of the Potsdam sandstone 

 of Iowa and Wisconsin. 



* Palaeozoic Fossils, vol. i, p. 411. 



