G68 Systematic Palkoxtolooy — ITrrER Devoniax 



paralli-l to the lines of growth in the shell, and, in the other ilireetion, 

 in (liaiional lines crossing these, giving the aspect of a (|uinciinx arrange- 

 ment. On the removal of the shell the carina on the cast iisually extends 

 but a short distance from the margin of the aperture, and the dorsum 

 beyond this is obtusely or obscurely angular." Hall, 1S79. 



Diameter 20 mm. : diameter aperture 22 ram. 



The specimen.s of this species, which occur in ^laryland. are usually 

 .smaller than those illustrated by Hall from New York although some are 

 equally large. Casts of the interior appear a little less rotund. Tlie 

 surface ornamentation agrees well with that of the typical forms. Cer- 

 tain poorly preserved specimens occurring in tlie Ithaca fauna at ]\H11- 

 stone appear to be referable to this species, but do not show the pustules on 

 the surface of the shell clearly. 



Occurrence.' — Jennings Foumatiox", Chejiung Member. Town 

 Creek, 2391, 2490. Parkhead Member. Williams Eoad, cm Polish 

 Mountain, KUiO; Town Creek, 1851; 2 miles west of Pawpaw, 17(53; 

 Little Orleans; 2i/> miles above mouth of Sideling Hill Creek. Wood- 

 mont Member, Ithaca ? Fauna. Millstone, 1141. 



Collection.— M&r}-\s.ji(\ Geological Survey. 



Family EUOMPHALIDAE 



Genus STRAPAROLLUS Montfort 



Straparollus marylandicus n. s]i. 



Plate LXVII, Figs. 23-25 



Desrrijilion. — Shell depressed, conical, volutions in contact, foui' or 

 more in number. Volutions slender, cross-section circular: sutures ])ro- 

 nounced. Umbilicus very large and deep, exposing all vnlutions. its 

 diameter much greater than that of volutions. Surface witli faint trans- 

 verse stria; crossing volutions o])liquely and somewhat fascicled. 



Diameter 20-25 mm.; height 1(1-13 mm. 



This species resembles S. cyclosiomus Hall of the Devonian of Iowa 

 hut differs from that species in its higher spire. Its very large umbilicus 

 distinguishes it from all other species of the fauna. 



