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PROCEEDINGS OF THE 



[July, 1857. 



and external maxillipeds, are long also, giving a hirsute appear- 

 ance to the under surface of the animal. 



The buccal frame is longer than broad, open anteriorly, as in 

 Calappa, Ilia, &c. the opening being between the bases of the 

 antennae; the external maxillipeds close it exactly, the second and 

 third segments about equal in length, and rather narrow, the third 

 diminishing in breadth to its anterior extremity, and giving inser- 

 tion to the terminal portion of the organ at the extremity of its 

 inner border; this terminal portion, (the three last segments,) is 

 very slender, almost filiform, and generally concealed in a groove 

 on the inner border of the third segment; the second segment of 

 the external maxillipeds is traversed obliquely by a piliferous 

 ridge, which causes this segment to appear as two; this circum- 

 stance has misled M. Edwards into the belief that the third seg- 

 ment is longer than the second. 



Abdomen narrow, about two-thirds the length of carapax, of 

 seven distinct segments in both sexes, the last three segments 

 curved under the others, but not extensive enough to conceal the 

 abdominal appendages. 



Color prevailing in the dry specimen, is purplish, mixed with 

 yellow and orange in places, particularly about the articulations 

 and spines ; the latter are generally purple at the base, orange in 

 the middle, and white at the tip; and the moveable finger of the 

 first pair of feet is colored much in the same manner ; the upper 

 surface of the first pair of feet is purple, purple tracings ornament 

 the outer surface of the remaining pairs of feet, particularly the 

 fourth and fifth, and the outer surface of the abdominal segments 

 is marked with two longitudinal lines of purple. The plate is 

 printed in a color approximating to the general coloration of the 

 specimen from which the drawing was made. 



Dimensions of largest specimen, a male figured in plate xiii. 

 length of carapax 1.55 inch, breadth 1.20 inch. 



Geographical Distribution. Inhabits coast of southern At- 

 lantic States; the first specimens I saw were brought from Key 

 West; a specimen in the Museum of the Medical College of 

 Charleston, is from Charleston harbor, or the ocean immediately 

 adjacent; and in 1846, on a voyage from Charleston to New York, 

 I obtained from the stomach of a fish taken at sea, off the coast of 

 North Carolina or Virginia, a single specimen of what I take to 

 be the young of this species. It was, of course, not fully devel- 



