PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 163 



Eev. A. M. IsTorman, appears to agree perfectly with tlie males of this 

 species, though not with Kroyer's description of Tanais EdwardsU. I 

 have not therefore united my species with his, though I think it possi- 

 ble they may prove identical. 



The species occurs in considerable abundance at Noank Harbor, Conn., 

 among algce, and also at Vineyard Sound, and will probably bo found 

 at other localities on the southern shore of New England. It has also 

 been collected by Professor Verrill, during the present summer, at Pro- 

 vincetown, Mass., in company with Limnorla and Chelura, in old piles. 

 The genus Leptoclielia has several years' priority over Paratanais, and, 

 though founded on the male sex, ought, as I think, to be retained. 

 Leptochelia limicola=r'rtmfa«flis?(m(co?aHarger, Am. Jour. Sci., Ill, vol. xv,p. 373, 

 1878. 

 Massachusetts Bay, olf Salem, 48 fathoms, mud. 

 Leptochelia rapax, u. s. 



Females of this species considerably resemble those of L. Umicola, 

 but nuiy be distinguished by the following characters : The eyes are 

 larger and more conspicuous; the last segment of the antennulje is 

 scarcely longer than the preceding, instead of nearly twice as long, as in 

 X. Umicola; the dactylus of the second pair of legs is somewhat shorter 

 and the terminal spine less attenuated, and the external ramus of the 

 uropods consists of a single very short and small segment, shorter than 

 the basal segment of the inner ramus, which is not elongated. The inner 

 ramus is live-jointed, instead of six-jointed, as in L. algicola. 



The males are remarkable for the long and slender prehensile hand 

 terminating the first pair of legs. The body of the males is short and 

 robust, with the segments well marked by constrictions. The head, 

 with the united first thoracic segment, is short and rounded, bulging 

 strongly at the sides just behind the eyes, which are conspicuous, some- 

 what less in diameter than the bases of the antennulte, distinctly articu- 

 lated, and coarsely faceted. The antennuhe are elongated, especially in 

 the basal segment, which is more than one-third as long as the body, 

 slightly swollen on the inner side, near the base, then tapering to the 

 tip; the second segment is cylindrical, less than half as long as 

 and more slender than the first ; the third is less than half the 

 length of the second, and is followed by about eight short flagellar seg- 

 ments, the last one tipped with seta". The antennje, when extended, do 

 not attain the end of the basal antennular segment ; the first three seg- 

 ments are short, the fourth longest, being longer than the first three 

 together, the fifth slender and tipped with sette. The terminal seti^e 

 of both antennuLTB and antennne arise in part fi*om minute or rudimen- 

 tary terminal segments. The first pair of legs forms the most striking 

 feature of this species. These legs, when extended, are in general 

 longer than the body of the animal, though they vary considerably 

 in size, being usually proportionally smaller in the smaller specimens. 

 In these legs, the segments preceding the carpus are short and robust ; 

 but the carpus is about half as long as the body, and the i^ropodus 



