c 



ME. E. J. MIEES ON THE IDOTEIDiE. 79 



of the first and second thoracic segments are visible in a dorsal 

 view below the lateral margins of the segments, which project 

 laterally and upwards and are themselves triangulate. The ter- 

 minal postabdominai segment is sinuated, scarcely toothed on 

 the sides. The eyes are situate apparently on the postero-lateral 

 lobes of the head ; the antennules scarcely reach to the base of 

 the antepenultimate joint of the antennae, whose terminal joint i.s 

 geniculate, i. e. bent outwardly at an angle with the preceding 

 joint. Distal opercular valves triangulate, with the apex subacute. 

 Length about 5 inch (8| millim.). 



^-€IiE±3SfTTS iTTENIJATA. 



Erichsonia attenuata, Harger, Rep. U.S. Fish Cornm. pt. i. p. 5/0, 

 pi. vi. fig. 27 (1874), pt. vi. Isopoda, p. 356, pis. vi. & vii. figs. 36, 37 

 (1880); id. Pr. U.S. Nat. Mus. ii. p. 160 (1879); Verrill, Rep. U.S. 

 Fish Comm. pt. i. p. 370 (1874). 



This species, according to Mr. Harger, is at once distinguished 

 from the preceding by its slender form and regular outline. The 

 body is smooth throughout and about six times as long as broad, 

 ■without prominent irregularities, and narrowly linear in outline. 

 The thoracic segments increase in size to the third, which is equal 

 to the fourth, and the last three are of a gradually decreasing 

 size. The postabdomen presents only slight traces of a lateral 

 tooth near its base, and is but little dilated towards the tip. The 

 eyes are small and black. The antennules are short, slightly 

 surpassing the second anteunal joint. The antenna are stout 

 and smoother than in the preceding species. The epimera are 

 nowhere conspicuous, but may usually be seen from above, espe- 

 cially in the posterior segments. The operculum is longer than 

 in the preceding species, the basal plate more than three times 

 as long as broad, and the terminal plate elongated, triaugular, 

 and obtuse. Specimens preserved in spirit are of a light 

 greyish yellow with minute black punctulations. Length rather 

 more than -^^ inch (15 millim..), breadth a little over y^ inch 

 (2i millim.). 



It was abundant, according to Mr. Harger, at New Jersey, 

 Grreat Egg Harbour, and has also been found at Noank, Connec- 

 ticut, U. S. A. 



I have seen no specimens. 



