ISOPODS OF NOBTH AMERICA. 



555 



FIG. 600. PBOBO- 

 PYRUS PANDALI- 

 COLA. LEG OF 

 SIXTH PAIR OF 

 ADULT FEMALE. 



X 39. 



FIG. 601. PROBOPY- 

 RUS PANDALICOLA. 

 MALE, x 41. 



double-branched lamellar appendages, closely crowded together on the 

 ventral side of the abdomen. 



The five pairs of incubatory lamellae surround a 

 large open area normally filled with eggs. The first 

 pair have the terminal lobe of the distal segment large, 

 well defined, and incurved. 



All the legs have a high quadrangu- 

 larly shaped expansion or carina on the 

 basis. 



Male with all the segments of the 

 thorax distinct, and with the lateral 

 margins contiguous. First four seg- 

 ments of the abdomen well defined at 

 the sides, but fused in the middle of the dorsal sur- 

 face. The last two segments form a single large 

 piece, the fused terminal segment being indicated only 

 by a small median point on the posterior margin. The 

 body is a little more than twice as long as wide. Eyes 

 are present. The rudimentaiy pleopoda are pairs of 

 small oval processes, one pair on each abdominal 

 segment. The abdomen is about one and a half times as broad as 

 long. 



PROBOPYRUS FLORIDENSIS Richardson. 



Probopyrus floridensis RICHARDSON, Proc. U. S. Nat. Mus., XXVII, 1904, pp. 

 70-71. 



Locality. Satsuma Island, above St. John's River, Florida, on 

 Pals&monetes exilipes Stimpson. 



Body of female light brown, with the head, abdomen, ovarian bosses, 

 and epimera light yellow, almost white. Markings of black are pres- 

 ent all over thorax and a few black lines are present on the abdomen. 

 The incubatory lamellae are almost entirely covered with black mark- 

 ings, so that the color is uniformly dark. The lateral parts of the 

 thorax on the ventral side have markings of black, those of one side 

 being in patches with yellow areas separating them, all the legs of 

 this side being yellow. The legs of the opposite side are dark. 



Head deeply set in thorax, broad anteriorly with frontal margin 

 nearly straight; posterior margin narrowly rounded; eyes wanting. 



The segments of the thorax are distinct. Ovarian bosses are prom- 

 inent on the anterior portion of the sublateral margin of the first four 

 segments; the epimera are present as narrow plates lateral to the 

 ovarian bosses. On the last three segments the epimera occupy the 

 whole of the lateral margin. 



The segments of the abdomen are distinctly separated on the dorsal 

 side. The lateral margins are narrowly rounded. The terminal seg- 

 ment of the bod} T is long and narrow, reaching beyond the lateral 



