NO. 15^3. PA RASITIC COBEPOD^— WILSON. 411 



two egg-strings is three-fifths that of the sixth segment plate, while 

 they are two-thirds as long again as the body. 



First antennae short, the basal joint as wide as long, and heavily 

 armed with setae, the terminal joint club-shaped, with a cluster of 

 setae at the tip. Second antennas small and rather weak, the terminal 

 claw of medium size and bent abruptly near the center. Its basal 

 half is flattened and laminate, while the terminal portion beyond the 

 angle is slender and cylindrical. The second joint has a mde laminate 

 ear or flap projecting from its ventral surface toward the fleshy adhe- 

 sion pad. 



The first pair of these adhesion pads are large and broadly elliptical, 

 one-fifth longer than the second pair; the latter are obovate, their 

 widest (anterior) diameter equaling their length. 



The fourth pair are especially long and narrow, their length fully 

 two and a half times their width, and half as long again as the first 

 pair. Mouth-tube of the usual pattern, inclosing the mandililes, 

 wlfich are very slender and armed with eight teeth at their tips on the 

 inner margin. Second maxillae with a tlfick and swollen base, a fleshy 

 second joint, and a short terminal spine, wlfich is stout and curved 

 like a claw. 



First maxillipeds slender and weak, the two joints about the same 

 length, the dorsal terminal claw twice as long as the ventral, the latter 

 with a short accessory spine at its base. Second maxillipeds much 

 swollen, the terminal joint fully as wide and thick as it is long, and 

 furnished with a movable claw, which shuts down against a raised, 

 tabular knob. The claw is wdde and thick, especially at the base, 

 where it is armed with a large spherical knob at the posterior corner 

 and a long slender accessory spine on the ventral surface. The raised 

 knob, against wlfich the claw shuts, has a flat, semicircular top, which 

 is roughly corrugated, to afl'ord a better hold against the skin of the 

 host. 



First swimnfing legs small and weak, the basal joint scarcely as 

 wide as the exopod; both rami two-jointed, the joints in the exopod 

 not as distinct as in the endopod. Second legs stouter, especially 

 the basal joint, but still rather weak; third and fourth pairs with 

 basal joints increasing regularly in size, their rami flat, laminate, 

 and boot-shaped; those of the second and tlfird legs distinctly two- 

 jointed, those of the fourth legs with the jointing indicated only by 

 marginal notches. The ranfi of these fourth legs are, as Rathbun 

 writes, considerably longer than those of cranchii, and are also some- 

 what longer than even the longest of those found in sinuatus. There 

 are no setae, and the spines are arranged as follows: First exopod, 1,5; 

 endopod, 0,3; second exopod, 0,10; endopod, 0,3; tlfird exopod, 1,4; 

 endopod, 0,2; fourth exopod, 1,5; endopod, 0,0. 



