I04 Bulletin 31 104 



field's drawings of the hinge are incorrect obliquatiis cannot be 

 referred to Crassate/lites. 



It is quite probable the specimens that grow to such 

 great size in South Carolina (for example, at Carson's Creek) 

 measuring 140 x 150 mm. may belong to this species and not 

 to alius. Certainly the numerous casts along the Neuse River, 

 N. C. are much closer tcxaltus than to altus. 



Type. — Texas State Univ. 



Horizon. — St. Maurice Eocene. 



Specimen figured. — The tj'pe. 



Localities. — Hurricane Ba5^ou (Marster and Hodges' head- 

 right — the type form), Alabama Bluff, Trinit\' River ; 25^ miles 

 E. of Newton ; 4 miles W. of Enterprise ; Wautubbee, Miss. ; ?Eu- 

 taw Springs, S. C. Seventeen miles above Newbern on the 

 Neuse River, N. C. 



Crassatellites aitus i^Dall PL 35. Fig. i. PI. 36. Figs. 4-6. 



Crassatella alta Con., Foss. Sh. Tert. Form, 1832, p. 21, pi. 7. 

 Crassatella alta de Greg., Mon. Faun. Eoc. Ala., 1890, p. 197, pi. 26, 

 figs. I-IO. 



Conrad's original description.— ^vihov^X, thick and ponderous, com- 

 pressed ; anterior margin obtusely rounded ; posterior margin broad and 

 slightly angular ; beaks with regular concentric grooves, and somewhat 

 angulated behind ; inner margin crenulated. 



This is one of the finest great bivalves known from our 

 Tertiaries. At Claiborne, specimens measuring 100 mm in height 

 and 100 plus in width or length are not rare. 



In considering the smoothness of the beaks of the St. Maur- 

 ice texaltus and the marked "concentric grooves" on the beaks 

 of the Claiborne alius, one may perhaps regard the whollj^ concen- 

 trically grooved willcoxi of the Wilmington (Jacksonian) as com- 

 pleting this type of ornamentation as shown in this stock. 



Type. — Phila. Acad. 



Horizon. — Claiborne Eocene. 



Specimens figured . — Paleont. Mus. Cornell Univ. 



Locality. — Claiborne, Ala. 



