MARINE ISOPODA OF NEW ENGLAND, ETC. 427 



the breast. The remaining thoracic feet are very slender, terminating 

 in sharp, slender fingers, which in the second pair are very long and 

 nearly straight, and in the other pairs short. The legs of the posterior 

 pair are a little the longest and thickest. The ambulatory feet, in five 

 pairs, are of great length and resemble those of Ainphipods. The caudal 

 stylets are in length about four-fifths that of the abdomen, and consist 

 of four or five articles, with few hairs, each article becoming narrower, 

 the last one with a tuft of few hairs at its extremity. Length .15 inch; 

 breadth .02. Dredged among Ascidicc callosce, in 20 fathoms, iu the Hake 

 Bay." 



I have seen no specimens corresponding fully with the above descrip- 

 tion, which is copied from Dr. Stimpson ; neither have I seen any speci- 

 mens of this family from the Bay of Fundy. I formerly regarded the 

 species from Vineyard Sound as Tanais filum Stimpson, and that name 

 is used in this Report, part i, p. 573 (279), where also "Bay of Fundy 

 to Vineyard Sound" is given as its range. This error was corrected by 

 the writer in the American Journal of Science in 1878. In the absence 

 of specimens from the Bay of Fundy I am unable to say positively that 

 this species is not the same as my P. limicola, although the number of 

 segments in the uropods does not correspond with those of that species, 

 and the outer ramus of the uropods, which is rather conspicuous in that 

 species, is not mentioned at all by Dr. Stimpson. Further investigation 

 is needed to settle this question, but the number of species known to 

 me from the coast seems sufficient warrant for regarding this, for the 

 present at least, as a distinct species. 



Dr. Packard states that he has dredged Tanais filum Stimpson in the 

 Gulf of St. Lawrence, " at Caribou Island, in eight fathoms, on a sandy 

 bottom." 



Leptochelia caeca Harger. 



Paratanais caeca Harger, Am. Jour. Sci., Ill, vol. xv, p. 378, 1878. 

 Leptochelia caica Harger, Proc. U. S. Nat. Mus., 1879, vol. ii, p. 164, 1879. 



PLATE XIII, FIG. 91. 



This species is at once recognized among our Tanaids by the absence 

 of eyes. The enlarged chelate claws joined to the united head and first 

 thoracic segment, and the six-jointed pleon serve to distinguish it as 

 belonging to the present genus. 



Body slender, elongated, and rather loosely articulated ; head narrow 

 in front, not broader than the bases of the antennuhe; eyes wanting; 

 antenuulaB distinctly four-jointed (pi. XIII, fig. 91 a] in the type speci- 

 men, first segment forming less than half the length of the organ, sec 

 ond segment longer than the third, last segment about as long as the 

 second, slender, tapering and tipped with setae ; antenna attaining the 

 tip of the third antennular segment. The first pair of legs (pi. XIII, 

 fig. 91 &) are robust, but less so than in the preceding species; they 



