454 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



Abdomen short and tapering rapidly from the base to the tip; 

 indistinctly jointed. Anal laminae small, well separated and diver- 

 gent, each armed with two short spines. Egg cases each as wide as 

 the genital segment and one-third of the entire length; eggs very 

 large, only six or eight in each case. 



First antennas large and prominent, their bases meeting at the mid- 

 line and forming a broad margin in front of the carapace. The 

 jointing is indistinct and shows differently in different specimens. 

 The basal portion consists of three joints — a rounded proximal joint 

 nearly semicircular in outline and armed with a single stout spine 

 on its anterior and posterior margins, a median joint much widened 

 and armed with a row of eight or ten stout spines along its anterior 

 margin and two huge curved claws or talons at the posterior distal 

 corner, while the rest of the posterior margin projects as a wide 

 rounded lamina, and a distal joint much narrower and shorter than 

 the other two and armed with a large spine on its anterior margin. 



The apical portion is cylindrical, about the same size throughout, 

 and made up of four or five joints, sparsely sprinkled with seta\ with 

 a good-sized bunch of larger and longer ones at the tip of the last 

 joint. 



The second antennae are stout. and three-jointed; basal and median 

 joints about the same size, the latter carrying a large accessory spine 

 on its inner margin near the base; terminal joint in the form of a 

 stout claw, abruptly bent near its center. Mouth tube long and wide, 

 with a bluntly rounded tip from which protrude the ends of the 

 mandibles. 



The second maxillae each consist of a large basal papilla tipped 

 with two long plumose seta 3 which reach beyond the end of the 

 mouth tube. First maxillipeds three-jointed, the basal joint fairly 

 stout, the median one a little shorter and much narrower and armed 

 at its inner distal corner with a bunch of short and stout spines and a 

 tuft of long, wavy hairs, the terminal joint in the form of a short 

 conical claw. Second maxillipeds large and elliptical, set close to the 

 lateral margin of the carapace and firmly anchored by a broad chitin 

 band which extends across the mid-line. The basal joint is stout and 

 tapers gradually outward; at the very base on the anterior margin 

 is a large laminate projection, two-thirds of the width and nearly 

 one-half the length of the joint itself; its surface is corrugated with 

 radiating ridges and short spines. The terminal joint is cylindrical, 

 the same diameter as the distal end of the basal joint and bent in the 

 form of a sickle. It is so much longer than the basal joint that, even 

 though curved, its enlarged tip shuts down along the entire outer 

 edge of the lamina just described and reaches a little beyond the base 

 of the basal joint. 



