382 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. f>8. 



surface is sparingly dotted with punctae, arranged partly in longi- 

 tudinal rows, one row of a few distant punctae extending through 

 the middle of the upper, and another through the middle of the lower 

 surface. 



The smaller specimen, paratype, belongs to the chela of a smaller 

 individual than the holotype and shows ver}^ little besides the dark- 

 colored end of the finger; five teeth are present, but are more crowded 

 than in the larger finger; the two larger teeth are relatively much 

 smaller and both are broader than long. 



Relations! dp. — These fingers have little resemblance to any fossil 

 species figured, but are akin to N. norvegicus, as stated above. If 

 the correspondence in the dentation of the fingers of the two species 

 is a dependable character, the holotype finger is a right, major, im- 

 movable finger; the other a left, major, immovable one. In both 

 fingers the three smallest teeth are nearer the upper than the lower 

 surface which is not true of the small teeth of norvegicus. 



NEPHROPS AEQUUS, new species. 



Plate 25, figs. 1-lc. 



Material. — Portion of a right manus and base of immovable finger 

 (holotype); and a short section of a finger discontinuous with the 

 holotype. From second bluff on left side of Kio Mao, about 2 or 2\ 

 miles by trail above the ford (Paso Bajito) at Cercado de Mao, 

 Dominican Republic; Cercado formation; lower Miocene series; 

 T. W. Vaughan and C. W. Cooke, collectors (8526). Cat. No. 328231, 

 U.S.N.M. 



Description. — ^^ianus about 10 mm. wide at base of fingers, prox- 

 imal end missing, so that length can not be estimated; much depressed, 

 not more than 3 mm. thick at distal end and 4J mm. thick at proximal 

 (fractured) end; widening rapidly toward fingers, outer margin 

 straight, inner margin slightly arcuate; upper surface with three 

 irregular rows of tubercles with depressed interspaces; a row of 

 tubercles near each margin, the intermediate row much nearer the 

 inner than the outer row; lower surface with three longitudinal rows 

 of distant punctae, the rows equidistant from one another and 

 from the margins. The base of the immovable finger is much de- 

 pressed and bears four teeth on its prehensile edge, the third tootli, 

 counting from the manus, being enlarged, and in j^rofile wider at 

 its base than it is long, from base to tip; both upper and lower sur- 

 faces show three lines of punctae and a longitudinal depression just 

 within the outer margin. 



The separate short section of finger, bearing four teeth, if it be- 

 longs to the same chela as the holotype, came from the movable 

 finger or dactylus. 



