ME. E. J. MIEES ON THE IDOTEID^. 23 



smoother, more sliining body, which is of an olive-green colour, 

 with fine longitudinal olive-browu lines, and which is covered 

 with more widely scattered punctulatious ; the antennae and legs 

 are of a clear grey, and the terminal postabdominal segment is 

 feebly emarginated. Length nearly ^ inch (12 mm.), breadth 

 about yL inch (2 mm.). Among algse. 



Having seen no specimens of this species, I cannot say whether 

 it is in reality distinct from the foregoing. 



Idotea "Whtmpeei, sp. n. ? (Plate I. figs. 6 & 7.) 

 Idotea, sp. ?, Miers, Journ. Linn. Soc. xv. p. 64 (1880). 



The body is of narrow-oblong form, the head comparatively 

 large, with a very slightly prominent broad and rounded median 

 lobe. Tlie sides of the body are parallel, the segments being of 

 equal width, the three or four posterior having their postero- 

 lateral angles (formed apparently b}^ the laterally projecting 

 epimera) acute. There are four distinct postabdominal segments ; 

 the first three very short ; the last is triangv;lar in form, with the 

 angles rounded, broadest at base, where it considerably exceeds 

 in width the preceding segments, and with the sides convergent 

 to the distal extremity, which is broad and obtusely rounded. 

 The eyes (black) are placed in the middle of the lateral margins 

 of the head. The antennules are apparently four-jointed ; the 

 antennae have six joints exposed, the four first thickened, and the 

 last two slenderer and more elongated ; the last ends in a pencil 

 of fine hairs. The legs are imperfect, but are armed with a sub- 

 terminal as well as a terminal claw. The plates of the operculum 

 are not oblong, but rather oval in shape, narrowing to the distal 

 end. Length scarcely l-g- line (3 mm.). 



North mid-Atlantic Ocean, lat. 57° 59' N., long. 19° 1' W, The 

 single example was obtained by washing seaweed taken on the 

 surface, and is mounted for the microscope. 



The joints both of the antenufe and postabdomen and the 

 epiraeral sutures are with difficulty discernible, and perhaps the 

 examination of a larger series of examples would necessitate an 

 emendation of some points in the description ; nevertheless, as 

 this example appears to be very distinct from any species with 

 which I am acquainted, I designate it by the name proposed for 

 it at the time of its original description. 



