110 BULLETIN 138, UNITED STATES NATIONAL MUSEUM 



CALLIANASSA UMPQUAENSIS, new species 



Plate 25, figs. 8-12 



Manus.— Outer surface (pi. 25, figs. 10 and 12) very convex from 

 top to bottom especially in upper half; nearly level from front to 

 back except near the ends. Inner surface (pi. 25, fig. 11) much less 

 convex and unevenly so. Proximal margin slightly oblique to the 

 upper and lower margins which are subparallel to each other, so that 

 the upper angle is slightly acutangular, the lower one obtusangular. 

 Upper and lower margins drawn to a thin edge, the upper edge 

 armed with from 9 to 11 saw teeth directed distad, each tooth tipped 

 with a short curved spine at the end of a sharp ridge, (pi. 25, fig. 

 11), and having a spreading base enclosing a socket from which pro- 

 ceeded probably a bunch of hairs ; an acute oblique ridge defines the 

 sockets on the inner surface. The lower edge bears smaller and more 

 numerous serrations, 14 appearing on each of three specimens, ex- 

 clusive of the proximal corner ; these teeth also embrace sockets and 

 terminate in short curved spines, but they are connected on the 

 outer surface with a smooth continuous ridge, and show no especial 

 feature on the inner surface. 



The lower half of the outer surface is occupied largely by a group 

 of 30 or more irregularly disposed tubercles situated midway be- 

 tween carpus and fingers (pi. 25, figs. 10 and 12). A row of several 

 tubercles subparallels the proximal margin, the largest tubercle 

 situated at the lower two-fifths or one-third. On the inner surface 

 (pi. 25, fig. 11) there is a group of tubercles similar to that on the 

 outside but composed of f cAver tubercles ; also near the distal, upper 

 corner a series of wrinkles. The smooth surface both inside and out 

 shows a few punctae and also obscure, elongate tubercles which ap- 

 pear to be in a substratum of shell. 



Fingers.— The propodal or fixed finger (pi. 25, fig. 12) is curved 

 gradually upward from the lower line of the manus. It is sub- 

 triangular in cross-section, thickest near the top, the outer ridge 

 smoothly rounded, the oblique upper surface marked by a line of a 

 few very large punctae, the oblique lower outer surface by two rows 

 of smaller and more numerous punctae which are continued on the 

 palm ; prehensile edge finely cremulate. 



The dactylus (pi. 25, fig. 8) or movable finger (5455 and 324) is 

 very thick except for a thin upper edge; the surfaces above and 

 below the smooth inner ridge have a few punctae; the outer sur- 

 face has a line of punctae on each margin; on the prehensile edge 

 near the base there is a stout tooth. The two fingers have the ap- 

 pearance of fitting close together when shut. 



