No, 26.] ARTHROSTRACA OF CONNECTICUT. 



Limnoria lignorum (Rathke). 



211 



Fig. 64. Limnoria lignortiin. 



1841. Limnoria terebrans, Gould, Invert. Mass., pp. 338, 354. 



1874. Limnoria lignorum, Harger, Rept. U. S. Com. Fish, 

 for 1871-2, p. 571, pi. 6, fig. 25. 



1880. Limnoria lignorum, Harger, ibid., for 1878, p. 373. 



1899. Limnoria lignorum, G. O. Sars, Crust Norway, vol. 2, 

 p. 76, pi. 31- 



Body three times as long as wide, oblong-ovate in form, 

 tapering somewhat in front. Head nearly globular, partly covered 

 above by first segment of thorax which is considerably longer 

 than the subequal succeeding ones. Coxal plates distinctly sepa- 

 rated on all the segments except the first. Eyes lateral, small, 

 composed of only a few ocelli. 



First antennae stronger than second ; flagellum extremely 

 small, triarticulate, with a dense fascicle of setae. Second 

 antennae with the flagellum about half the length of peduncle and 

 made up of five joints of which the first is much the largest. 



First pair of legs larger than the succeeding ones but oi the 

 same form. Last pair more slender than the others. Dactyls of 

 all the legs furnished with a large spine at the apex and a 

 smaller one on the concave margin near the apex. 



Abdomen scarcely smaller than thorax, tapering but little; 

 first four segments of equal length; fifth much longer; telson 

 elliptical, broader than long, evenly rounded behind and fur- 

 nished with setae. Uropods with peduncle strongly tuberculated 



