52 PROCEEDINGS OF THE jSTATIONAL MUSEUM. vol.60 



siderable interval. A small accessory lobe on the outside of each 

 leg at the base of the outer fold. Fourth legs divided to their base, 

 the rami flattened and widest at the center ; a pair of short fifth leg 

 rudiments just in front of the genital segment. Egg strings longer 

 than the whole body; eggs small and numerous. 



Color (preserved material) a uniform brownish gray. 



Total length, 9.50 mm. Width of anterior portion of dorsal plate, 

 1.75 mm.; of posterior portion, 3.50 mm. Length of egg strings, 

 16.75 mm. 



/Specific charact\ers of male. — Cephalothorax subpyriform or ellip- 

 tical, the anterior end somewhat narrowed, the proportion of the 

 length to the width as 5 to 4. Second (first free) segment about the 

 same width as the head; third segment widened through the bases 

 of the third legs, which stand out almost at right angles to the body. 

 Fourth, fifth, and genital segments fused, with the fourth legs ex- 

 tending backward and outward at an angle of about 45°. The 

 spermatophore receptables are large and reach forward nearly to 

 the center of the bases of the fourth legs. 



First antennae six jointed; second pair relatively larger than in 

 the female and appearing even larger still because they are not con- 

 cealed at all. Mandibles slender, cylindrical, jointed once near the 

 base, the ii]) flattened dorsoventrally and armed along the inner 

 margin with a row of saw teeth. Maxillipeds a little larger than 

 those of the female. First and second swimming legs as described 

 for the female. Third legs biramose, the endopod much shorter than 

 the exopod; fourth legs also biramose, the exopods flattened and 

 much widened through the center, the endopods only half as long as 

 the exopods and cylindrical. 



Color (preserved material) a uniform yellowish gray. 



Total length, 2.50 mm. Cephalothorax 1.25 mm. long, 1 mm. wide. 



Length of fourth legs, 1.50 mm. 



(paenulatus, wearing the paenula or cloak.) 



Remarks. — This species was determined to be new by the late Dr. 

 M. T. Thompson, who had compiled a rough description of both 

 sexes, accompanied by numerous pencil sketches, and had suggested 

 the name which is given above. Two of his sketches are here pub- 

 lished and the present author has borrowed freely from his notes. 



The distinguishing characters of the species are the narrow body 

 wrapped in its long cloak, the small and widely separated third legs, 

 the visible tips of the fourth legs in the female, and the very short 

 endopods of the third and fourth legs in the male. The female is 

 long and narrow and thus the very opposite of chlamydotus, which 

 is the only other species with the posterior portion of the dorsal plate 

 enlarged and wrapped around the fourth legs and the egg strings. 



