494 Syst£matic Paleontology 



Order PROPARIA 

 Family CALYMENIDAE 



Genus CALYMENE Brongniart 



Calymene cameilvta Conrad 



Plate LXXXIX, Fig. 9 



Calymene camerata Conrad, 1842, Jour. Acad. Nat. Sci., Phila., vol. viii, p. 



278. 

 Calymene camerata Hall, 1852, Pal. N. ¥., vol. 11, p. 337, pi. Ixxviii, figs. la-f. 



Description. — " Cephalic shield wide, subcrescent form ; anterior 

 margin elevated in a strong fold, a deep groove separating it from the 

 front of the glabella and cheeks ; glabella broader and nearly straight in 

 front, furnished on each side with three distinct tubercles, the posterior 

 one very large and prominent, the anterior one minute; eyes opposite 

 to the central lobe of the glabella; the furrow between the glabella and 

 cheeks very deep; a projecting lobe from behind the eye touches or unites 

 with the middle of the three lobes of the glabella, and a similar projecting 

 plate from the inner anterior angle of the cheek touches the front lobe of 

 the glabella near its anterior angle. Axis of the body convex, nearly as 

 wide as the lateral lobes ; pleura convex and straight for half their length, 

 and then gently curved downwards and flattened, grooved along the center. 

 Caudal shield with eight rings in the middle lobe ; lateral lobes with six 

 flat ribs strongly bent downwards ; surface granulate, with larger tubercles 

 on the glabella and other parts. 



" The specimens examined are all imperfect, and the surface markings 

 are also more or less obliterated. The characteristic features are the deep 

 furrow along the front and cheek margins, and between the glabella and 

 cheeks, and the projecting lobes from the inner margins of the cheeks which 

 touch or unite with the glabella, arching over the axial furrow. In the 

 two separated cephalic shields, the portion beyond the facial suture is 

 wanting, and in the more entire specimen it is too obscure to be char- 

 acterized." Hall, 1852. 



Occurrence. — Helderberg Formation, Keyser Member. Cash 

 Valley, Devil's Backbone, Maryland ; Keyser, West Virginia. 



Collection. — U. S. National Museum. 



[Maynard.] 



