0. Harcjer Isopoda from New England. 377 



which, however, in the ordinary reflexed position becomes the ex- 

 ternal side. Eyes distinct, visible both above and below. Pleon 

 imperfectly segmented, elongate. Maxillipeds two-jointed. 



P. tennis, sp. nov. Body smooth, slender, flattened above, 

 broadest at the base of the pleon. Head broader but shorter 

 than the first thoracic segment, narrowed to a point in front and 

 less acutely behind. Eyes prominent, black, within the margin 

 of the head. Antennula?, when reflexed, attaining the third 

 thoracic segment ; first segment large but not longer than the 

 second ; third shorter than the second, followed by a short first 

 flagellar segment, second and following segments about twenty 

 in number, obconic, fitting into each other, flattened and naked 

 on one side, which is the outer and somewhat inferior side in the 

 reflexed organ, densely elongate-ciliate distally, except on the 

 flattened side ; cilia attaining about the fifth following segment. 

 Antenna3 hardly surpassing the peduncle of the antennulae, 

 eight-jointed. Maxillipeds with a quadrate basal segment, emar- 

 ginate externally for the subtriangular external lamella, and 

 bearing a single scarcely smaller terminal segment, truncate and 

 ciliate at the tip. Thoracic segments slender, margined, the 

 seventh but little over half as long as the others. First pair 

 of legs moderately enlarged, segments well separated, dactylus 

 strong, shorter than the inner margin of the propodus; remain- 

 ing pairs of legs slender. Pleon about as long as the last three 

 thoracic segments, first five segments consolidated along the 

 median line, each rising into a low broad tubercle on each side 

 of the median line ; last segment as long as the preceding five ; 

 telson elongate-ovate obtusely pointed. Uropoda equaling the 

 telson. Length llrnm., breadth 0'9mm., color in life brownish 

 and somewhat mottled above, lighter below. 



This species has been found on the New England coast 

 from Noank Harbor, Conn., to Casco Bay, Maine. 



Paratanais algicola, sp. nov. 



Tanais filum Harger, Rep. U. S. Com. Fish and Fisheries, 

 part 1, p. 573. 1874, non Stimpson. 



Eyes conspicuous, black, plainly articulated, larger in the 

 males. Antennulae in the females three-jointed, tapering, 

 setose at the tip, first segment as long as the last two which 

 are subequal ; elongated and eleven-jointed in the male, the 

 first segment long, curved upward near the base, last eight 

 segments with olfactory seta3. Antennae short, five-jointed, 

 deflected, fourth segment longest. First pair of legs robust, 

 hand short and stout in the female, digital process scarcely 

 toothed, bearing three seise near its inner margin; hand in 

 males strongly chelate, digital process elongated, curved, two- 

 toothed ; dactylus curved, slender, with about seven setiform 

 spines on its inner margin ; carpus in the males long and stout. 



