356 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



when turned down against the carapace, the appendage points 

 directly away from the proboscis nearly at right angles. 



First maxillipeds of the usual pattern, the terminal claws rather 

 stout, the external one considerably longer than the internal. Second 

 maxillipeds swollen and fleshy, the terminal joint enlarged into a huge 

 kidney-shaped adhesion pad, destitute of pinchers, knobs, or claws. 

 This pad has exactly the same structure as those at the bases of the 

 antennae; the adhesion surface is tough and leathery, is surrounded by 

 a raised margin, and is minutely corrugated and irregularly furrowed, 

 but shows no traces of scales or anything of the sort even under a one- 

 twelfth oil immersion lens. Opposite these large second maxillipeds 

 the laterar margin of the carapace on either side is raised into a large 

 spherical knob on the ventral surface, pointing downward and inward 

 toward the base of the maxilliped, and even in contact with the latter 

 in preserved specimens. 



Swimming legs all biramose, each ramus of the first two pairs 

 distinctly two-jointed, of the third pair partially, and of the fourth 

 pair almost wholly, fused into a single joint. Exopods each armed 

 with stout spines, of the same number and similarly arranged, one at 

 the outer distal corner of the proximal joint and four in a row across 

 the end of the distal joint. Endopods with portions of the surface 

 covered with minute papillae or spines. Outside of each exopod in 

 the tlu-ee posterior pairs is a small rounded knob, like a rudimentary 

 third ramus, bearing on its summit a long and flexible spine. 



The basal joints of each pair of legs are subrectangular in outline 

 and increase rapidly in size from in front backward, those of the 

 fourth pair being fully eight times the size of the first. In the first 

 two pairs these basal joints are attached by their anterior margins, in 

 the tliird pair by the antero-interior corners, and in the fourth pair by 

 the centers, of the interior margins, the rami in each case being borne 

 on the posterior margins. In all the exopods the basal joint is con- 

 siderably larger than the terminal; in the endopods of the first and 

 second pairs the terminal joint is the larger, whils i i the third and 

 fourth pairs it is reduced to a mere knob on the side of the basal joint. 

 The iifth legs consist of a long papilla, broadly triangular at the base 

 and strongly flattened, attached to the ventral surface of the genital 

 segment halfway between the lateral margin and the mid-line, and 

 armed with three slender spines. 



Of the reproductive organs each egg tube is coiled once in the 

 genital segment, and each of the three strands of the coil runs the 

 entire length of the segment and fills its side out to the lateral margin. 

 The vulva or oviduct opening is at the tip of a raised rectangular 

 papilla, situated close to the base of the abdomen on either side. 

 The spermatophores are club-shaped, narrow and elongate, and 

 apparently jointed at the center. They are attached just outside the 



