ME. E. J. MIEES ON THE IDOTEID^. 77 



Narrow-linear : head without a dorsal tubercle ; thoracic 

 segments with the lateral margins straight. 

 Q i» i „^L,^,J>^_ ^' ^' °ti^n^C'i(i (Harger). 



ANGTJLATA. 



^j£A:9nrrs 



Erichsonia angulata, Dana, Amer. Journ. of Sci. and Arts, (ser. 2) viii. 

 p. 42/ (1849) ; id. U.S. Expl. Exp. xiv. Cr. ii. p. 710, pi. xiv. fig. 10 

 (1853). 



Is described by Dana as long elliptic ; body a little convex, 

 front excavated ; head with two tubercles on the anterior margin 

 and with two crenations on each side, in the posterior of which 

 the eyes are situated. Head and thoracic segments angulated- 

 transverse ; four anterior segments of thorax with a tubercle at 

 the middle, first and second triangular in outline on either side, 

 third and fourth polygonal, the fourth the broadest and longest. 

 Postabdomen uniarticulate, oblong, subscutellate, margin sinuous, 

 broadest near apex, extremity triangulate obtuse. Eyes of mode- 

 rate size. Antennules not one third the length of the antennae. 

 Antennae longer than half the body, geniculated, 6-jointed ; last 

 three joints subequal, penultimate shortest, the last obtuse, clavate, 

 and pubescent. Legs subequal, two posterior and two anterior 

 shortest, basal joints stout and generally tuberculated. Epimera 

 angular and visible from above, excepting the third and fourth 

 pairs, the third is sometimes apparent in an upper view. Colour 

 brown or yellowish brown ; penultimate joint of legs with a black 

 or brownish transverse band. Length |-inch. 



Eio Janeiro. Among seaweed in the harbour ; found with 

 Cajjrellce. 



The above descrij)tion is adapted from Dana's generic and 

 specific descriptions and observations. 



In the specimen observed by Dana the two frontal tubercles 

 were situated a little to the left of the centre, the right antenna 

 was a little larger than the left, and no tubercles were seen on 

 the basal joints of the anterior legs. 



'-Ghbantts filteoemis. (Plate III. figs. 7 & 8.) 



Stenosoma filiformis, -Say, Journ. Acad. Nat. Sci. Philad. i. p. 424 

 (1818); M.-Edw. Hist. Nat. Cr. iii. p. 134 (1840); DeKay, Zool. 

 New York Fauna, vi. Cr. p. 44 (1844). 



Idotea filiformis. White, List Crust. Brit. Mus. p. 95 (1847). 



Erichsonia filiformis, Harger, Rep. U.S. Fish Comm. pt. i. p. 670, 

 pi. vi. fig. 26 (1874) ; id. Pr. U.S. Nat. Mus. ii. p. 160 (1879) ; id. Rep. 



