PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 1G3 



Eev. A. M. Norman, appears to agree perfectly witli the males of this 

 species, thouoh not with Kroyer's (lescrii)tion of T<in<iis EdirardtiU. I 

 have not therefore united my species with his, thoui^h 1 think it possi- 

 ble they may i)rove identical. 



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

 among algte, and also at Vineyard Sound, and will jjrobably bo found 

 at other localities on the southern shore of Xew I'^ngland. It has also 

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

 vincetown, Mass., in com])any with Limnoria and Chclura, in old piles. 



The genus Leptochelia has several years' priority oxer Pa ratuna in, and, 

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

 Leptochelia linucola= PflratonaisZmico to Harger, Am. Joiir. Sci., Ill, vol. xv.^i. 378, 

 1878. 



Massachusetts Bay, off Salem, 48 fathoms, mud. 

 Leptochelia rapax, n. s. 



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

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

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

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

 L. limicoJa; the dactylus of the second pair of legs is somewhat shorter 

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

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

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

 ramus is five-jointed, instead of six-jointed, as in L. ahjicola. 



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 antennukT, distinctly articu- 

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

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

 slightly sv.oUen 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 setfe. The antennre, 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 seta?. The terminal settB 

 of both antennuhe and autenuie 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 A'ary 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 propodus 



