632 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvin. 



of this dorsal surface, opposite each egg tube, projects a short, conical 

 papilla, without seta? or spines. 



From the ventral surface on either side of the abdomen and at a 

 little distance from it, a second pair of papillae project backwards. 

 These are much larger than the first pair, and each of them carries 

 three good- sized plumose seta?. These latter are not arranged in a trio 

 at the tip as usual in this genus, but stand in a row along the outer 

 margin of the papilla, one close to the tip, another near the center, 

 and the third between these two, In the Bermuda specimens there is 

 also a third pair of papilla?, each of which is situated just outside and 

 superior to the base of the large ventral papilla on its side. This third 

 pair is the smallest of the three, and each of its papilla? is tipped with 

 a single long and slender seta. The large ventral pair evidently rep- 

 resent the fifth legs; the other pairs are simply processes without 

 special significance. Abdomen small, less than one-third the length 

 of the genital segment, and attached to the ventral surface of the latter 

 in front of its posterior border, so as to be almost wholly concealed in 

 a dorsal view. It is swollen a little near the base, and then at the base 

 where it joins the genital segment it is abruptly contracted into a short 

 neck of about one-third its full diameter. It is made up of a single 

 segment, three-fifths as wide as long, and terminates in lamina?, which 

 are three-quarters of its own length. These lamina? are half as wide 

 as long, and are armed with four slender plumose seta? considerably 

 longer than both abdomen and lamina?. The egg strings are wide and 

 a little more than half as long as the whole body. Eggs very large, 

 their antero-posterior diameter being often fully half their lateral 

 diameter, and hence only 15 to 25 eggs in each string. 



Since the abdomen is thus upon the ventral surface, while the open- 

 ings of the egg tubes are in the center of the posterior surface dorsal 

 to the abdomen, it follows that the egg strings, when extruded, cover 

 the dorsal surface of the abdomen, and practically complete the con- 

 cealment partially accomplished b}^ the overhanging of the dorsal sur- 

 face of the genital segment. This position of the egg strings, dorsal 

 to the abdomen, is very unusual in the genus, the two being exactly 

 reversed in relation in all other known species. 



In the appendages the basal joint of the first antenna? is robust and 

 heavily armed with spines along its anterior and inner border. The 

 terminal segment is slender, longer than the basal, and armed with 

 numerous spines toward the distal end, and a single one at the center 

 of the posterior border. 



Second antennae of medium size, with the terminal hook strongly 

 curved. Both pairs of maxilla? consist of single curved spines, the 

 first pair strongly curved, the second pair nearly straight. Terminal 

 claw of the second maxillipeds less than half the length of the basal 

 joint, the latter being fairly stout. 



