 The ulnar styloid process ( a projection on the ulna , one of the bones of the forearm , where it meets the wrist ) is not as hooked as in other lorisids , according to Schwartz , which Groves suggests may indicate that the wrist is more mobile . Another alleged diagnostic feature is the presence of an entepicondylar foramen ( an opening near the distal , or far , end of the bone ) on the humerus ( upper arm bone ) ; however , Sarmiento found this feature in 4 out of 11 specimens , and on one side of a fifth , and Stump noted that the foramen occurred in specimens from across the potto 's range . 
