34 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXII. 



composed of about twenty-five elongated segments; 8econdai\y flagel- 

 lum slightl}' shorter than the first segment of the primar}^ flagelhmi, 

 consisting of two segments, the distal one short; entire antennae fur- 

 nished with comparatively few short hairs. Second antennas slightly 

 more than half as long as the first pair; two distal segments of the 

 peduncle elongated, nearh^ equal in length, the third segment short; 

 flagellum not so long as the two distal segments of the peduncle, com- 

 posed of about six elongated segments; antennas furnished with a few 

 hairs and a number of large olfactory clubs. 



Carpus of the first gnathopods in the male short and broadly trian- 

 gular, nearly as broad as the propodus; propodus slightly longer than 



Fig. 4. — EUCRANGONYX BIFURCUS, MALE. MaCOX, MISSISSIPPI. 



broad; lateral margins couA^ex, the posterior provided with four or 

 five small fascicles of hairs; palm oblique, armed on each side with 

 about twelve spines and a few hairs; dactyl strongly bent near the 

 base, as long as the palm. Second gnathopods with the carpus and 

 propodus YQYY similar to those of the first pair, but more elongated; 

 the palm more oblique, armed with about fifteen notched spines; 

 posterior margins furnished with six small fascicles of hairs. 



Last three pairs of pera?opods with the coxal plates oval, both 

 margins serrate and armed with small spines. 



Abdominal segments rounded dorsally; postero-lateral angles of the 

 first three segments produced backward into a tooth. 



