322 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



the iiropocls on the posterior margin. The uropods are slender, easily 

 detached, and liable to escape observation. They are nearly alike in 

 the two sexes, and consist on each side of an elongate, somewhat curved 

 and clavate basal segment, bearing at the end two rami, of which the 

 inner is nearly as long as the basal segment, the outer somewhat smaller 

 and shorter. The rami are slightly flattened, and, like the basal seg- 

 ment, armed with setas, especially at the tip. The branchial pleopods 

 are protected in the female by a subcircular operculum (pi. Ill, fig. 13 a). 

 In the male, the inferior surface of the pleon (pi. Ill, fig. 13 6) presents on 

 each side a nearly semicircular plate (b), with its inner margin overlapped 

 by a median, elongated, and narrow plate (c), marked along the median 

 line by a suture. This plate is broadest near the base, then contracts on 

 each side to beyond the middle, after which it expands slightly. The 

 median suture is open near the tip, and, on each side, is a rounded lobe, 

 separated by a sinus from the produced external angle. 



Length of body, exclusive of the antennas and uropods, 8°"", breadth 

 3mm Color in alcohol usually pale or brownish, with smaU black dots on 

 the upper surface. The under surface is lighter, as are the legs and an- 

 tennae, especially toward their distal extremities. 



This species is at once distinguished from the common European J. 

 maculosa Leach by the form of the head, which is rostrate, and has also 

 the antero -lateral angles strongly salient, while in J. maculosa the ante- 

 rior margin of the head is nearly straight and the angles are not pro- 

 duced. From Senopomus tricornis Kroyer,* as described and figured by 

 that author, it differs in the elongated uropods. 



This species has not been found south of Cape Cod. Dr. Stirapson's 

 specimens were " dredged in soft mud in 40 f. off Long Island, Gr. M.," 

 in the Bay of Fundy. It was dredged in Massachusetts Bay ! in from 54 

 to 115 fathoms mud, sand, and stones in 1878. In many locahties given 

 below in the Gulf of Maine! from 35 to 115 fathoms in 1873, 1874^ and 

 1877, and 120 miles south of Halifax!, N. S., in 120 fathoms gravel and 

 pebbles in 1877. It has also been obtained from several localities in the 

 Bay of Fundy !, in one case at low water on Clark's Ledge, near East- 

 port, Me. A specimen was collected in 1879, by Mr. Charles Ruckley, 

 of the schooner ' H. A. Duncan,' thirty miles east of the Northeast 

 light on Sable Island, adhering to a specimen of Faragorgia^ from a 

 depth of 160 to 300 fathoms. 



•Naturhist. Tidssk., II, B. ii, p. 380, 1847; Voy. en Scand., Crust., pi. xxx, figa. 2 

 «-j, "1849." 



