Boone — Addition to Floridian Decapod Crustacean Fauna. 139 



as long as the first and extends to the distal end of the peduncle of the 

 antennae; the third article is a trifle shorter and slenderer than the second; 

 the inner flagellum is longer and stouter than the outer; and is about a 

 third as long as the flagellum of the antennae; the outer flagellum of the 

 antennules is a little more than half as long as the inner. 



The epistome is shield-shaped, produced to a decided spine at the apex 

 between the base of the antennules, there is another spine on each side at 

 the outer margin of the antennules ; the space between these spines is deeply 

 roundly excavate, the anterolateral margin of the epistome slopes abruptly 

 diagonally from these spines to the outer lateral angle of the base of the 

 antennae. 



The exopodites of the first pair of maxillipeds are normal with brushes. 

 The second maxillipeds have the exopodite well developed, multiarticulate, 

 with brushes. The third maxillipeds have the exopodites very poorly 

 developed. 



The sternal plastron is decidedly shorter and broader than those of P. 

 argus and P. guttatus, anteriorly it terminates in a blunt rounded nodule; 

 the sterna corresponding to the first pair of appendages is roughly triangular, 

 and bears a deep groove in the median line ; the sterna corresponding to the 

 second, third, and fourth pairs of limbs are similar in shape but graduatingly 

 increase in width posteriorly, the fourth being widest. The sutures between 

 all the sterna are distinct, those of the second to fourth sterna inclusive 

 extend inward slightly more than half the distance to the median line, that 

 of the fifth sterna extends farther in, almost to the median line, its apex is 

 distinctly punctate. 



The first pair of legs are stout, the second are longer and slenderer, the 

 third are the longest, the fourth are about the same as the second, the fifth 

 are the shortest and weakest, all have the dactyl stout, acute and furnished 

 with bristles on the first, second, and third legs, and with slender spines 

 interspersed with bristles on the fourth and fifth legs. 



The first abdominal somite is short, decidedly grooved; the second and 

 third somites are the longest, subequal; the fourth somite is about four- 

 fifths as long as the third; the fifth somite is about four-fifths as long as the 

 fourth; the posterior of each somite is fringed with short close-set setae. 

 The lateral angles of the somites are produced into acute teeth directed 

 posteriorly; that of the first segment is most acute, those of the second and 

 third are broader, of the fourth and fifth more curved, of the sixth broadly 

 curved, less acute; the post lateral margins of all the somites are finely ser- 

 rate just above the apical tooth, while in P. argus there is a single spine, and 

 also the same in P. guttatus but slightly differently placed. Pleopoda are 

 wanting on the first abdominal segment, those of the second segment con- 

 sist of a single broad, ovate, membraneous lamina; the pleopoda of the third 

 segment are about one and one-half times as long as those of the second and 

 narrower; those of the fourth segment are slightly longer than those of the 

 third, while those of the fifth segment are smaller and more acuminate. 



Color. — The carapace is maroon, the spines of the carapace are green with 

 a purplish maroon base except those on the lateral margin which are set 

 in a light creamy buff base. Orbital spines purple mottled with light 



