428 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxm. 



From the two side plates a pair of secondary ribs extend forward 

 and inward, each pointing toward the tip of the maxilla on the oppo- 

 site side. The mouth opening is terminal and heavil}^ fringed with 

 hairs. First maxillipeds of the usual form, the secondary terminal 

 claw very short and conical; second pair large and swollen, the basal 

 joint almost twice as wide as long and considerably flattened dorso- 

 ventrally. The terminal joint is shaped like a flexible finger or thumb, 

 and is attached transversely along the outer end of the basal joint. 



The four pairs of swimming legs are all biramose, rami of the first 

 three pairs two-jointed, of the fourth pair one-jointed. 



The exopods of the first and fourth pairs are longer than the endo- 

 pods; in the second and third pairs the rami are about equal; the 

 basal joints of the first and fourth pairs are widened, but not more 

 than half as much as those of the second and third pairs. None 

 of these basal joints carry spines or setae except the third pair, 

 in which a very large seta projects diagonally backward from 

 the inner corner. The fifth legs are entirely lacking; the arrange- 

 ment of the spines and setae on the other four pairs is as follows 

 First exopod, 1,0; 4, III: endopod, 0, 0; 0, IV: second exopod, 2, I 

 4, V: endopod, 0, I; 0, VI: third exopod, 1,1; 4, IV: endopod, 0, I; 

 0, IV: fourth exopod, 5, IV: endopod, 0, IV. 



The ovaries are large and elliptical in form; they can be seen just 

 above the digestive tract near the anterior margin of the thoracic 

 area of the carapace. The oviduct leads back in the usual way to 

 the genital segment, where it is coiled in three parallel strands run- 

 ning lengthwise along either sitle of the segment. It finally opens 

 to the exterior on the ventral surface just in front of the abdomen. 

 The cement glands are long and narrow, the cells in each being nearly 

 as long as wide; they lie just beneath the inner coils of the oviduct 

 and are slightl}^ curved, the concave sides toward each other. The 

 semen receptacle is large and crescent shaped; it consists essentially 

 of three spherical pockets or sacs, one on either side below the opening 

 of the oviduct, and the third at the center connecting the two. The 

 duct leading from these lateral sacs is carried past the point where it 

 opens into the oviduct, and is coiled into a blind pointed sac, which 

 turns forward alongside the outer margin of the sperm receptacle 

 (fig. 204). 



Total length, 7 mm.; length of carapace, 2.8 mm.; width of same, 

 3.8 mm. ; length of genital segment, 2.7 mm. ; width of same, 1.7 mm. ; 

 length of egg strings, 13.5 mm. 



Color a light yellowish white, fairly transparent and not showing 

 very distinctly against the white background of the shark's throat. 



The coils of the oviduct in the genital segment are a darker yellow 

 and opacjue; the egg-strings are almost pure white. 



