Description of Three New Fossils from the Falls of the Ohio, 

 by Isaachar Cozzens. Read December 8th, 1845. 



Although many of the states have employed competent geolo- 

 gists to explore their territories, it cannot bo but that many objects 

 of Natural History must unavoidably have been unnoticed by them ; 

 this, I suppose to have been the case with tho fossils I am to de- 

 scribe. 



About the year 1810, the late Rev. Benjamin O. Peers put into 

 my hands a number of fossils, which he informed me were obtained 

 at the falls of the Ohio river. After due examination of some twenty 

 or thirty distinct species, I selected three, which 1 believe to have 

 been hitherto undescribed. One of these, of which I have three 

 specimens, appears to be the buckler of a crustaceous animal ; the 

 other two arc shells belonging to the classes mollusca and conchi- 

 fera ; the ono a bivalve, and allied to the Spirifer of Sowerby or 

 Delthyris of Dalman; the other a univalve, belonging to the family 

 of Orthoccrata. I shall begin by describing the Crustacean. 



Genus Piliolites, (from iriXiov, a scull cap.) 



Buckler gibbous, anterior and posterior margins, with a groove ; 

 the anterior groove deeper than the posterior, more slightly grooved 

 on the sides. 



* Oiiioensis. Buckler gibbous, ovate, arched, margined, anterior 

 margin smaller and sloping downwards ; postorior, thicker and 

 turning up ; lateral margins very small. Plate X. fig. 1 , a.b. 

 The three specimens from which this description is made, are 

 all precisely alike, both in form and size. They have the appear- 

 ance or shape of that part of the human skull which is above the eyes 

 and cars ; across the front is a furrow, and at the ends of this furrow 

 are placed small protuberances resembling eye-brows, under these 

 protuberances, the eyes were most probably situated as in living 

 crabs. The nearest recent species which this fossil relic! resembles, 

 is the Loucosia craniolaris, Fabr.; but in this ani I I lit of 



