132 



BULLETIN .">4, UNITED STATES NATIONAL MUSEUM. 



long, and has the posterior margin widely rounded and armed with 

 eleven long teeth, live on either side of the median one. This segment 

 is 27 mm. long. The uropods do not quite reach the extremity of the 



terminal abdominal segment. 

 The inner branch is nearly twice 

 as wide as the outer branch and 

 is a little longer. Both are 

 truncate posteriorly and have 

 the exterior and posterior mar- 

 gins armed with numerous 

 spines. The peduncle of the 

 uropoda has the inner angle but 

 little produced. The pleopoda 

 have ramified branchiae devel- 

 oped at the base of the inner 

 branch. 



The first three pairs of legs 

 are prehensile, the last four 

 pairs ambulatory. They are all 

 armed with numerous spines. 



A larger specimen in the col- 

 lection of the U. S. National 

 Museum measures 4: in. : 8 in. 

 It is from the Gulf of Mexico. 

 Wood -Mason and Alcock" 

 describe the living animal as 

 being a pale lilac color. Bou- 



FIG. 113. BATHYNOMVS GIG ANTEUS( AFTER FII.HOIJ. 

 VENTRAL VIEW. 



FIG. 114. BATHYNOMUS GIGANTEUS (AFTER EDWARDS AND BOI-VIER). HEAD WITH APPENDAGES AND 



FIRST THORACIC SEGMENT. 



vicr says that while the isopods usually have at the most in each 

 eye thirty to forty ocelli, which measure eight to ten centimeters, 

 with a diameter of a millimeter, />. </!(/<mf< //* has almost three thou- 



Ann. Mag. Nat. Hist. (6), VII, 1891, p. 270. 



