no. 1718. 4 NEW ISOPOD FROM GUATEMALA— RICHARDSON. 497 



is furnished with two long spines. The uropoda occupy all the space 

 between the lateral parts of the fifth segment and the apical part of 

 the sixth segment. 



The peduncle is large, somewhat obliquely placed, and has the outer 

 branch inserted along the inner margin. The inner branch does not 

 extend beyond the tip of the abdomen and is concealed by it. The 

 outer branch is also short and does not extend beyond the apical 

 process of the last abdominal segment. 



There are seven pairs of ambulatory legs. 



Only two specimens of this species were collected by Dr. O. F. 

 Cook at Trece Aquas, Guatemala. 



Type-specimen,— Cat. No. 40082, U.S.N.M. 



The two specimens are very small and so completely rolled up 

 that only a diagrammatic drawing could be made. 



Proc. N. M. vol. 37—09 32 



