162 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



triangular, gently curved, shorter than the hand; movable finger larger 

 and stronger than the fixed one, having a moderately strong prominent 

 ridge upon the inner side, between the front end of which and the ex- 

 tremity of the finger there is sometimes a distinct tooth. Surface nearly 

 smooth, but some examples are granulate about the middle of both sides 

 of the hand, and several small foramina are observable along the upper 

 margin of the movable finger. 



Length of hand, 13 millimeters; breadth, 10 millimeters; thickness, 

 4 milbmeters. (Museum No. 8910.) 



Position and locality. — This species has been sent to the United States 

 National Museum by Mr. E. O. Ulrich, in whose honor the specific name 

 is given. He obtained it from Cretaceous strata near Little Kock, Ark. 

 Associated with it, besides certain characteristic Cretaceous mollusca, 

 there are several separate movable fingers which plainly belong to an- 

 other decapod crustacean ; but although complete in themselves, they 

 constitute too small a portion of the animal to satisfactorily base a specific 

 description upon them. 



