o84 Systematic PALKONToLOGY^UrrEn Devonian' 



This is one of the characteristic specie? of the Ithaca fanna of Xew 

 York and Maryland. 



Occurrence. — Jexxixgs Formation, ^YooDiIONT Member, Ithaca 

 Fauna. Two miles west of Pawpaw, West A^irginia, 1340, 1388 common ; 

 Little Orleans, 1466; Fifteenmile Creek, 1 mile above Little Orleans, 

 1446; Woodmont, 720, 1024, 1032; National Eoad west of Tonoloway 

 Eidge; Hancock 690, 994 ?; Hancock-Harrisonville Eoad, 725 common, 

 880, 944; Millstone 795; Berkeley Springs 1058, 1080, 1163 abundant; 

 Yellow Springs, West Virginia. 



Collection. — ^Maryland Geological Survey. 



Superfamily TEREBRATULACEA 

 Family TEREBRATULIDAE 



Genus CRYPTONELLA Hall 

 CrYPTONELLA cf. EUDORA Hall 

 Plate LIV, Fig. 23 

 Cnjptonella eiidora Hall, 1867, Pal. of N. Y., vol. iv, p. 398, pi. Ixi, tigs. 34-41. 



Description. — Shell elongate or broadly oval, terebratiiliform ; bicon- 

 vex; ventral valve produced at the nmjjo which is truncated by a round 

 foramen Ijeneatli which lie, except in advanced growth, two deltidial 

 plates. On the interior the dental plates are well developed. The dor- 

 sal valve is subcircular and regularly convex. Surface of valves smooth 

 or with only fine concentric striae. 



Length 'iO iniii. ; width 2(1 mm. 



Internal casts which seem to pertain to the species have been found in 

 a few localities. The ventral valve shows the long dental plates, thickened 

 pedicle-sheath and punctate shell characterizing these Devonian tere- 

 bratuloids. 



Occurrence. — Jennings Formation, Chemung Member. Town 

 Creek, 4716 abundant, 4769; road up Polish Mountain from Tar Creek; 

 Williams Eoad, Polish Mountain. 



Collection. — Maryland Geological Survey. 



