No. 26.] ARTHROSTRACA OF CONNECTICUT. IO5 



Last two pereiopods subequal and stout with merus and carpus 

 considerably expanded especially in male; basus of third, fourth, 

 and fifth pereiopods broadly oval. 



Terminal uropods biramous, extending beyond the others; 

 rami short and broad, inner one narrower than outer and slightly 

 shorter, provided with a small spine near base of inner margin; 

 outer ramus with three -fascicles of spines on outer margin; tips 

 of both rami truncated and armed with numerous spines. 



Telson reaching to base of rami of terminal uropods, nearly 

 as broad as long, and cleft two-thirds of the way to the base; 

 lobes oblong and notched at the apex where there may be one or 

 two spines. 



Body olive brown to grayish, marked with numerous small 

 rounded lighter- colored spots and a series of larger light spots 

 along mid-dorsal line. In specimens having much gray pigment 

 the legs are barred with dark bands which in other specimens 

 may be scarcely visible. 



Length 10 mm. 



Distribution: New Jersey; Vineyard Sound; Provincetown ; 

 Woods Hole, Massachusetts; Long Island Sound; Noank, off 

 Stonington, Connecticut. 



The species is found under rocks and amid sea weed at low 

 tide. At Noank it was also found on piles in sponges, etc., in 

 eel-grass, and on the surface. 



Females captured in August at Woods Hole were found with 

 eggs. 



Dikerogammarus Stebbing. 



Agreeing in general with Gammarus; but with fourth and 

 fifth abdominal segments each raised dorsally to a spiniferous 

 tubercle. First antennae longer than second and with well devel- 

 oped accessory flagellum. 



First and second gnathopods larger in male than in female; 

 second pair larger than first. 



Dikerogammarus fasciatus (Say). 



1818. Gammarus fasciatus, Say, Jour. Acad. Nat. Sci., Phila., 

 vol. i, pt. 2, p. 374. 



1874. Gammarus fasciatus, Smith, Rep. U. S. Fish. Com., 

 1872-3, p. 653. 



