Maryland Geological Survey 469 



Represented in Maryland by a single imperfect form to which only 

 enough of the shell adheres to show the diagnostic axial sculpture upon 

 the final half turn, a character which in the absence of the flange of the 

 outer lip serves to separate it from P. goldmani. 



Occurrence. — Monmouth Formation. Eailroad cut 1 mile west of 

 Seat Pleasant, Prince George's County. 



Collections. — Maryland Geological Survey, New Jersey Geological Sur- 

 very, U. S. National Museum. 



Outside Distribution. — Mataivan Formation. Wenonah sand, New 

 Jersey. Black Creek Formation. ? North and ? South Carolina. 

 Ripley Formation. Exogyra costata zone, Eufaula, Alabama ; Union and 

 Tippah counties, Mississippi. 



PUGNELLUS GOLDMANI n. Sp. 



Plate XVII, Figs, 5, 6 



Description. — Shell large for the genus and relatively thin, quite 

 highly polished ; outline exclusive of the alate outer lip, broadly and sym- 

 metrically lenticular, the maximum diameter falling near the median 

 horizontal; whorls five in number, very closely appressed, regularly and 

 rather rapidly increasing in size, those of the spire trapezoidal in outline, 

 not constricted at the sutures so that the sides of the spire converge evenly 

 and uninterrupted to the obtuse apex at an angle of approximately 35° ; 

 body whorl smoothly and gently rounded ; external surface smooth, except- 

 ing for two or three incipient axial undulations upon the periphery of the 

 final half turn, and for the faint incremental striatums; sutures very 

 closely appressed and indistinct ; outline of aperture rudely and somewhat 

 obliquely rectangular; outer lip alate, produced backward upon the pen- 

 ultima, thickened marginally, acutely angulated posteriorly at approxi- 

 mately 90° ; labium oblique to feebly convex, roughly parallel to the lateral 

 margin of the labrum; parietal wall free from wash; anterior extremity 

 imperfect. 



Dimensions (imperfect individual). — Altitude, 54 mm.; maximum 

 diameter, exclusive of outer lip, 25 mm.; maximum diameter, including 

 outer lip, 42 mm. 



