No. 26.] 



ARTHROSTRACA OF CONNECTICUT. 



251 



This species has been found at Savin Rock, near New Haven, 

 and Stony Creek, Connecticut, in company with Philoscia vittata 

 Say, by Professor Verrill. 



ARMADILLIDIDJE. 



Body convex, contractile into a ball. 



Antennae comparatively small, with flagellum bi-or triarticu- 

 late. 



Head flanked by side plates of first thoracic segment, front 

 margin subtruncate, lateral lobes distinct; median lobe obsolete; 

 epistome vertical. Mouth parts similar in structure to those of 

 the Oniscidse. 



Legs comparatively short and uniform in structure, ambula- 

 tory. 



Abdomen not abruptly contracted. Terminal segment short 

 and broad. Opercular plates of first two pairs of pleopods, or of 

 all five pairs, provided with air spaces. Uropods short, not ex- 

 tending beyond the limits of the last segment and lateral plates 

 of the fifth segment. 



Armadillidium vulgare (Latreille). 



FIG. 84. Armadillidium vulgare. 



1818. Armadillo pitularis, Say, Jour. Acad. Nat. Sci. Phila., 

 vol. I, p. 432. 



1841. Armadillo pitularis, Gould, Invert. Mass., p. 336. 



1899. Armadillidium vulgare, G. O. Sars, Crust. Norway, 

 vol. 2, p. 189, pi. 82. 



