G60 Systematic L^aleoxtology — Uppeu Devonian 



\vhieli |)r()l)al)ly scrxcd fcr llic attnchnieiU (if the pedal muscles; pallial 

 line dislinet; cardinal area det'].)ly striated anteriorly to iiiiiho, stria' 

 curved. A posterior lateral tooth or slender fold is parallel to cardinal 

 margin. The valves are unequal in convexity, a feature not well shown 

 in figure. 



Length 50 mm.; height '.'<> mm. 



A larger amount of material may show this to he a distinct species. 



Occurrcjice. — Jennings Formation, Chemung ]\Iember. Town 

 Creek, 3578, 3584 common. 



Collection. — Maryland Geological Survey. 



Superfamily LUCINACEA 

 Family LUCINIDAE 



Genus PARACYCLAS Hall 

 I'aKACYCLAS MAHYLANUIOA n. sp. 



Plate LXVl, Fig. 25 



Description. — Shell of medium size, subcircular ; height equal to or 

 slightly greater than length; pallial margin regularly curving from ex- 

 tremities of hinge; cardinal line short. Valves regularly convex, lenticu- 

 lar in sha])e. Beak slightly anterior to middle, small, appressed, closely 

 incurved, rising liut little ahoN'e hinge-line; umbonal slope limited l)y a 

 shallow furrow extending to about middle of posterior extremity. Test 

 thin, bearing concentric stria; which are in fascicles at irregular intervals. 



Length 25 mm. ; height 23-25 mm. 



This species closely approaches P. clUiilicu of the Onondaga, dilTering 

 chieily in its smaller size, less convexity of valves, umbo slightlv less 

 pronounced. It resembles that species so closely, however, that it may 

 be regarded simply as a mulation of that form. 



Occurrence. — Jennings Fou.mation, Chemung JMe.mbeh. Town 

 Creek, 3770. 



Collection. — ^laryland (ieological Survey. 



