40 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.80 



P 



or five long setae on its anterior margin ; claw fully as long as the 

 terminal joint and itself segmented near the base, where it carries 

 a few long setae on its outer margin. 



Endopod of first legs much longer than the exopod, with three 

 fingerlike processes on the outer margin of the second segment. 

 Endopod of second legs prehensile, the second segment tipped with 

 two long and slender, spinelike appendages, closely juxtaposed, each 

 ending in a minute claw. On the inner margin of this segment 

 close to the bases of the spines are two setae, longer than the spines. 

 Fifth legs with the terminal segment broadly triangular and armed 

 with five large plumose setae and a much smaller nonplumose one, 

 the third from the inner corner. Inner expansion of the basal seg- 

 ment not quite reaching the tip of the terminal segment and tipped 

 with two plumose setae. A pair of rudimentary sixth legs on the 

 ventral surface of the genital segment just behind the median suture, 

 each consisting of a small knob tipped with three setae. 



Color (preserved material). — Light brown. 



Measurements. — Length : Female, 0.7 mm. ; male, 0.8 mm. 



Occurrence. — Several specimens, including but a single female, 

 were taken in a bottom net at Station T on March 29, 1921, from 

 water 9 meters deep over a muddy bottom. The species was not 

 found elsewhere in the bay. 



Types.— \J.^.'^.M. No. 58561, male, holotype; No. 63418, 2 males, 

 1 female, paratypes. 



Remarks. — The single female was kept intact, and the description 

 of the appendages is based upon those of the male, which are con- 

 trasted with the male of tenuis., the genus type, described by Sars.* 

 The chief points of difference are found in the general body form, 

 especially the proportions of the various parts, and in the details of 

 the second antennae, mandible, and second legs. 



TACHmiUS LITTORALIS Poppe 



Tachidius littoralis Poppe, Abh. Naturw. Vereiiie, vol. 7, p. 149, pi. 6, 1881. 



Occurrence. — A few females were taken at the surface at Station 

 L' on October 19, 1920, in water 8 meters deep. A single female 

 was captured in the bottom net at Station N' on January 25, 1921, 

 in water 11 meters deep. 



Remarks. — Poppe's specimens came from the mouth of the Ems 

 Hiver in northwestern Germany. Brady classed it as a brackish- 

 water species found in estuaries and salt marshes. Such localities 

 agree well with the two shallow water stations here in Chesapeake 

 Bay, mentioned above. As far as known the species has not before 

 been reported from American shores. 



'Crustacea of Norway, vol. 5, p. 334, pi. 222, 1909. 



