78 ME. E. J. MIEES OIT THE IDOTEIDj:. 



U.S. Fish Comm. pt. vi. Isopoda, p. 355, pi. vii. figs. 38-41 (1880); 

 Verrill, Rep. U.S. Fish Comm. pt. i. p. 316 (1874). 



Body slender and elongated, strongly serrated in a lateral out- 

 line in a dorsal view, with, nearly parallel sides and a median row 

 of prominent tubercles, one large and bifid on the bead, and one 

 on eacb tboracic segment. Head quadrate. In the first two 

 segments of tbe thorax the postero-lateral angles are salient and 

 much elevated, in the third and fourth both antero-lateral and 

 postero-lateral angles are salient but not elevated ; in the last 

 three segments only the antero-lateral angles are produced. 

 Postabdomen about one third the length of the body, with a 

 more or less evident tooth on each side near the base, and dilated 

 and obtusely triangular at apex. Eyes prominent. The anten- 

 nules reach beyond/ 'le middle of the third antennal segment. 

 Antennae more thau^truif as long as the body, with the basal 

 segment very short, next two or three times as long as the first, 

 third to fifth nearly cylindrical, and the last or flagellar segment 

 the longest and slightly clavate, bristly-hairy towards the apex. 

 The epimera are visible from above in a dorsal view in front of 

 the antero-lateral angles of the first and second segments, aild 

 behind the antero-lateral angles in the three posterior* segments. 

 The operculum is a little more vaulted than in O. attenuata and 

 shorter, the basal plate is less than three times as long as broad, 

 its terminal plate is triangular. Colour usually a dull neutral 

 tinb, without bright markings, but sometimes more or less 

 variegated with brown or reddish, fading in alcohol. Length 

 about -f-^ inch (11 millim.), breadth rather xiuder \ inch (3 4 

 millim.). 



This species, Mr. Ilarger observes, was originally described from 

 Grreat Egg Harbour, Noav Jersey. It is not uncommon along 

 the shores of Long Island Sound, and as far east as Yineyard 

 Sound, Massachusetts, but has not yet been found north of 

 Cape Cod. 



There is in the Museum collection a single di'ied specimen 

 from Egg Harbour (J. Say). 



In a specimen in the Paris collection from Gloria (Brazil ?) 

 (MM. Castlenau & Deville) which I refer with much hesitation 

 to this species, there is a single strong bilobated tubercle on the 

 upper surface of the head ; there is a distinct median dorsal 

 tubercle only on the first thoracic segment, the three following 

 being carinated rather than tuberculated j the angulated epimera 



