22 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



second pair of antennas are shorter than the first pair, not extending 

 much beyond the end of the second article of the first pair. 



The first free segment of the thorax is a little shorter than any of 

 those following. The second and third free segments are subequal, 

 and each is a little longer than the first segment. The fourth and 

 fifth free segments are subequal, and each is longer 

 than either of the two preceding segments. The 

 last free segment is shorter than either of the two 

 preceding segments, and is about as long as the 

 second and third segments. 



The abdomen is composed of six segments, five 

 short, subequal ones anterior to the terminal seg- 

 ment, which has the posterior margin rounded. 



FIG. 23. HETEROTANAIS 

 LIMICOLA (AFTER 

 HARGER). FEMALE. 

 x 20. 



FIG. 24. HETEROTANAIS LIMICOLA. a, FIRST LEG OF 

 FEMALE, x 77. b, FIRST ANTENNA, c, SECOND 



ANTENNA. X 77s. 



The uropoda are double-branched. The inner branch is composed of. 

 five articles; the outer branch has two articles. 



The first pair of legs or gnathopods" are chelate. All the other six 

 pairs are ambulatory. The dactylus of the second pair of legs is 

 longer than the propodus. 



There are five pairs of well-developed pleopoda. 



I have seen only one rather imperfect specimen. 



6. Genus LEPTOCHELIA Dana. 



Gnathopods in male with chelae fully developed, very much elon- 

 gated; fingers elongate and curved, with immovable one strongly 

 tuberculate within. Marsupium of female composed of eight large 

 lamellas issuing from the first four free segments. Eyes present. 

 Five pairs of pleopoda present. Uropoda double-branched; inner 

 branch multiarticulate; outer branch composed of one or two articles. 

 Gnathopods in female strong. First pair of antennas in female com- 

 posed of three articles and a rudimentary flagellum. First antennas 

 in male much more elongated and with a multiarticulate flagellum. 



See Stebbing for characters of genus, Trans. Zool. Soc. London, 1886, XII, p. 108. 



