5G() Systematic Paleoxtology — Upper Devoxiax 



The specimen? figui'ed resemble the hitter spec-ies in their irregular 

 shajje, though this i? not a constant feature of this variety. 



Length 22 mm. ; width 25 mm. 



Occurrence. — Jennings Formation, Chemung Member. National 

 Road 7 miles west of Frostburg; Oakland- Altamont Eoad; Oakland- 

 Eedhonse Eoad; Trout Enn ; near Deer Park; National Eoad near top of 

 Polish Mountain ; Ellerslie. Pennsylvania, i;ll(;, 1474. 



Colleriioii. — jMaryland Geological Survey. 



Productella speciosa Hall 

 Plate LI, Figs. 13-15 



Productus spcciosufi Hall, 1S57, 10th Rept. N. Y. Stale Cab. Nat. Hist., p. 17G 

 Productella speciosa Hall, 1SG7. Pal. of N. Y., vol. iv, p. 175, pi. xxv, 



figs. 1-11. 

 Productella speciosa Grabau and Shimer, 1909, N. Amer. Index Foss., vol. i, 



p. 242, fig. 294. 



Description. — Shell broadly ovate, subheraispheric ; hinge-line shorter 

 than the greatest width of the shell. Ventral valve ventricose; dorsal 

 valve concave. Surface of ventral valve with fine concentric striae and a 

 few short wrinkles on the nmbonal slopes. Both valves abundantly 

 S]5inons, much more so than in P. JacJinjmosa. 



Length 20 mm.; width 27 mm. 



This species differs from P. lachrymosa in its more closely set spinules 

 and smaller umbo. In some of the Maryland individuals the umbo is 

 larger than in the specimens fignred by Hall. It is, however, smaller and 

 less inflated than in P. lachrymosa. This is one of the most abundant 

 and characteristic species of the Ithaca fauna both of Maryland and of 

 New ^'ork . 



Occurrence. — Jennings Formation, Woodmont Member, Ithaca 

 Fauna. Two miles west of Pawpaw, West Virginia, 1340, 1388 abun- 

 dant; Little Orleans, 1446 abundant; Fifteenmile Creek, 1 mile above 

 Little Orleans, 144G : Woodmont, 710, 77G, 1020, 1032, 10G7; National 

 Eoad, west of Tonoloway Eidge, 980, 1029 abundant, 1038 abundant; 

 Berkeley Springs, W. Va., 77-5, 1058, 1()G4, 1074, 1080, 11G3, 1371; 

 National Eoad, east of Hancock, 690, 994, 1149 1231; Hancock-Harrison- 



