THE CRUSTACEA OF NEW JERSEY. 299 



pairs armed with comb-like teeth. Only three pairs of pleopoda 

 present, all rather fully developed, with densely setiferous 

 lamelliform rami. Uropoda simple, not much elongated, formed 

 of a limited number of articulations. Incubatory pouch formed 

 by two lamellae only, issuing from base of fifth pair of legs. 

 Species rather few. 



Tanais robustus H. F. Moore. 



Plate go. 



Tanais rohushis H. F. Moore, Proc. Acad. Nat. Sci. Phila., 1894, P- 90. PI- 

 5. Sea Isle City, New Jersey (on Caretta caretta). 



H. Richardson, Amer. Nat., XXXIV, 1900, p. 211. Cape Cod to North 



Carolina region. 



PI. Richardson, Proc. U. S. Nat. Mus., XXIII, 1901, p. 501. New Jer- 

 sey. 



H. Richardson, Bull, U. S. Nat. Mus., No. 54, 1905, p. 11 (copied 



Moore). 



Description. — Biody elongated, robust, width little over three 

 times its length. Head widest portion of body, narrowed in 

 front, posterior edge slightly concave medianly, as seen above 

 anterior lateral edges concave, and front edge ends in minute 

 rostrum. Eyes and lobes large, latter placed in deep recesses in 

 anterior lateral portion of head. 



First antennae of three segments, basal segment somewhat 

 longer than combined length of others and small knob or 

 rudimentary flagellum terminal. Male with first antennae 

 usually about equal to head length with first free thoracic 

 segment, but sometimes considerably longer. Female with first 

 antennae about equal to head length alone. Second antennae lie 

 close beneath first antennae, by which slightly exceeded in 

 length both in male and female. Second antennae five-jointed, 

 fourth joint longest or slightly exceeding second, with fifth, 

 third and first following in order named, and last mentioned 

 very short. Each second antenna ended by densely setiferous 

 rudimentary flagellum, considerably longer than that of first 

 antennas and sometimes imperfectly articulated. Mandibles 

 of usual form, curved inward at tip where a pair of horny. 



