No. 26.] ARTHROSTRACA OF CONNECTICUT. 223 



or less similar structure throughout and furnished with setae 

 along inferior margin of merus, carpus, and propodus. 



Abdomen of two short, free segments and a long telson show- 

 ing indications of a partial coalescence of a third short segment. 

 Telson tapering to a pointed apex, lateral margins exhibiting an 

 obtuse, rounded angle behind the middle so that the posterior 

 part tapers more acutely than anterior part. Operculum with 

 basal plate tapering toward the end and with triangular terminal 

 ramus which is a little longer than broad. 



Color very varied, usually dark green or brownish with 

 patches of yellow or whitish. In general the color is darker than 

 in /. baltica. 



Length 25 mm. 



Distribution : coast of New England to Halifax, Nova Scotia, 

 and the Gulf of St. Lawrence. 



This species is found in conditions similar to the preceding 

 one but is a more northern form as it is comparatively rare south 

 of Cape Cod while it is abundant in Casco Bay and the Bay of 

 Fundy. It has been collected within the limits of Connecticut at 

 New Haven, Stony Creek, off Saybrook, and Noank Harbor. 



It is readily distinguished from the other species of the same 

 genus by the pointed telson. 



Edotea triloba (Say). 



1818. Idotca triloba, Say, Jour. Acad. Nat. Sci. Phila., vol. 

 I, p. 425. 



1874. Epelys trilobus, Harger, Kept. U. S. Com. Fish, for 

 1871-2, p. 571, pi. 6, fig. 28. 



1880. Epelys trilobus, Harger, ibid., for 1878, p. 358, pi. 7, 

 fig. 42-43. 



1905. Edctea triloba, Richardson, Bull. U. S. Nat. Mus., No. 

 54, P- 396. 



Body ovate, nearly two and one-half times as long as wide; 

 abdomen less than one-third as long as whole body. Head pro- 

 duced slightly in front with two conspicuous tubercles very close 

 together on either side of middle line, situated on front margin; 

 antero-lateral angles of head produced in rounded lobes upon 

 which the prominent eyes are placed. 



