158 S. I. Stnith on American Crustacea. 



There are specimens before me collected at Egmont Key, west coast 

 of Florida, by Col. E. Jewett ; at Bluffton, South Carolina, by Dr. J. 

 H. Mellichamp (collection Peabody Academy of Science), and at Fort 

 Monroe, Virginia, by Dr. Kneeland. 



Several specimens give the following measurements : — 



The abdomen of the male is broadest at the third segment, the first 

 and second are much narrower and of equal length ; from the fourth 

 to the sixth, the abdomen is broad and the lateral margins converge 

 regularly ; the terminal segment is scarcely a third as wide, but about 

 as long, as the sixth, and very little longer than broad. The appen- 

 dages are similar to the appendages of S>. reticulata^ but those of the 

 first segment are a little shorter and much stouter. 



Sesarma occidentalis, sp. nov. 



A species closely allied to S. cinerea Say. 



Male. The carapax is quadrilateral in outline and considerably 

 broader than long. The dorsal surface is flat in the middle and pos- 

 teriorly, but somewhat convex in front and along the sides. The pro- 

 togastric lobes are convex and divided by slight depressions anterior- 

 ly, and the surface is rough with coarse, sharp granules arranged in 

 very short, irregular, broken lines. The median portion of the gas- 

 tric region is sparsely granulous, surrounded by a shallow sulcus, and 

 the mesogastric lobe is very narrow and extends far forward in the 

 well marked, median sulcus between the protogastric lobes. The 

 branchial regions are traversed by indistinct transverse plications, 

 and the posterior regions are punctate with indistinct, shallow puncta. 

 The front is nearly perpendicular, quite high and slightly concave, the 

 concave surface is irregularly and coarsely granulous, and the inferior 

 margin is curved forward somewhat beyond the crest and its edge is 

 nearly straight. The antero-lateral tooth is acute and projects well 

 foi'ward. The lateral margin is sharp, continuous, and nearly straight 

 as seen from above. 



The chelipeds are equal, short and stout ; the anterior angle of the 

 merus is sharp, dentate and raised into a thin crest at the end next 



