35^ 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



The segiiK'nts of the thorax are about equal in length. The (^piuiera 

 of all the segments from the second to the seventh, inclusive, are dis- 

 tinct and occup3' the whole of the lateral margin; the} are large plates 

 which in the last four segments are produced into ver}^ long, acutely 

 pointed extremities. 



The first three pairs of legs are subchelate, with propopus expanded 

 {'nd dactylus reflexed. The last four pairs of legs are ambulatory. 

 The inferior margin of the propodus in the lirst three pairs of legs is 

 armed with numerous long spines alternating with several short ones. 



L_C2i::siS!^XISi^ 



Fk;. ;>/.!.— Mesuxitk.v sabini (After Kkoyek). Showing detailed parts. 



The abdomen is composed of tive segments, four short ones followed 

 by a ver}' long terminal one partly coalesced with the last short seg- 

 ment. The terminal segment tapers to an extremely long, pointed 

 extremity. About halfway from the base to the end of this segment 

 is a slight indication of an angle on either side, possibly rudiments of 

 lateral angles. The opercular valves are each in two parts, a large 

 l)asal part and a short, narrow, pointed terminal part, the exterior 

 branch; the inner branch is seen on the underside as a small oval lobe 

 at the base on the exterior side of the other branch. 



58. Genus CHIRIDOTEA Harger. 



Palp of maxillipeds composed of three articles. Sides of h(>ad cleft. 

 Eyes dorsally situated. Second anteiunv with a multi-articulate fiagel- 

 lum. Epimera of all the segments of the thorax with the exception 

 of the first distinctly separated from the segments. Abdomen com- 



