624 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 40. 



Fig. 3.— Mga. oe- 

 nata. First 

 maxilla. x6s§. 



The first segment of the thorax is the longest and is a little more 



than twice as long as the second; the second, third, and fourth 



are subequal, each being 0.5 mm. in length; the fifth and sixth are 



subequal and each is a little shorter than the preceding segment; 

 the seventh segment is the shortest. The last three 

 segments have a row of small tubercles, set close 

 together, on the posterior margin. All the segments 

 except the first are furnished with epimera; those of 

 the second and third segments do not reach beyond 

 the posterior margins of their respective segments and 

 are rounded posteriorly; the last four have the outer 

 post-lateral angle produced, gradually increasing in 

 length to the last, and all extending beyond the poster- 

 ior margins of their segments; the last three have small 

 tubercles on the posterior margins. All are furnished 

 with a carina. 



The first segment of the abdomen is almost entirely 

 concealed; the following three segments are subequal 



and each has the posterior margin furnished with a row of small 



tubercles, set close together; the fifth segment is a little longer than 



any of the preceding segments and in addition to the row of tubercles 



on the posterior margin has a few on the dorsal 



surface about the middle. The sixth or terminal 



segment is triangulate in shape with the apex 



truncate and furnished with five small teeth, one 



in the median line and two on either side. The 



lateral margins of the segment are incised, the two 



anterior incisions extending only a short distance 



from the lateral margin, but the three posterior ones 



extend to the sides of the median furrow. The 



upper end of each incision is marked by a tubercle 



on the posterior side; there is also one on the 



anterior side of the first and third incisions at the 



upper end. A row of small tubercles is also placed 



at the base of the segment, extending from one 



side to the other. The inner branch of the uropoda 



is a little longer and wider than the outer branch 



and extends a little beyond the extremity cf the abdomen. Both 



branches are rounded posteriorly and crenulate. The first three 



pairs of legs are prehensile, the last four pairs ambulatory. 



Only one specimen was obtained by the Albatross in 1885 from the 



Atlantic Ocean off the southern coast of the United States. It was 



found parasitic on the Red Porgy (Pagrus pagrus). 

 The type is Cat. No. 42377, U.S.N.M. 



Fig. 4.— Mga oenata. 

 Second maxilla. 

 X124. 



