CRUSTACEA— MALACOSTRAC A. 



385 



which is laterally compressed ; antennae large and strong. Devonic- 

 Mississippic. 



28. P. newberryi Whitfield. (Fig. 1690, a^c.) Devonic-Mississippic. 

 A sharp carina extends along the axis of cephalothorax and 



Fig. 1690. a, PalcBopalcBJjion newberryi, X | 5 <^> caudal fin and last thoracic seg- 

 ment ; (T, same from impression in matrix. (After Whitfield.) 



bifurcates near anterior extremity; abdomen tapering rapidly to 

 telson. (Type of genus.) 



Chagrin (Erie) shales of Ohio; Kinderhook of Iowa. 



XVI. Anthrapal^mon Salter. 

 Carapace longer than wide, simple, convex, with the sides arched 

 outwards; front margin serrate; antennae with wide, square basal 

 joints and slender outer joints, the inner pair of flagellae biramous ; 



Fig. 1 691. a, Anthrapalcemon gracilis, X /^» upper surface of carapace removed ; 

 b, enlargement of caudal fin and last segment ; r, Palceocaris typus, y^ 2; d, caudal 

 portion enlarged ; e, a single abdominal foot enlarged. (Ind. Survey. ) 



abdomen of six segments; telson broad, lateral flaps much subdi- 

 vided. Carbonic. 

 29. A. gracilis Meek and Worthen. (Fig. 1691, a, &.) Carbonic. 



Joints of flagella of outer antennae short; segments of peduncles 

 articulate obliquely ; lateral margins of carapace in front of middle 

 finely serrate. 



Coal Measures of Illinois. 



