﻿NORTH AMERICAN NOTOSTRACA — LINDER 



Ridge round^ 

 legbearingarea 



43 



body-ring 



S.a.pl 



Figure 17. — a, Oblique ventral view of part of the abdomen and telson of the largest female; 

 of Lfpidurus lynchi, new species, showing a right-handed spiral of a little more than four 

 rounds beginning in the leg-bearing part of the body and forming the entire legless part 

 of it, X 8.5. The telson is shown in ventral view because of a slight natural torsion of the 

 telson. Legs omitted, as well as spines on caudal filaments. Only basal parts of supra- 

 anal plate and caudal filaments shown. (C/., caudal filaments; S.A.pL, supra-anal plate; 

 Sp, spiral; T, telson.) b. Schematic drawing of the spiral. 



V 



Figure 18. — Dorsal view of posterior emargination of the carapace of a female paratype of 

 Lepidurus lynchi, new species (Uppsala Museum), X 7. 



fringed with setae on its caudal margin; in para types (fig. 21) var3ang 

 lengths, but fifth endite always at least double the length of fourth and 

 reaches, when stretched backward, usually nearly to the posterior 

 angle of carapace. On second leg endites 3, 4, and 5 rather similar in 

 length, endopodite long, 2.2 mm., pointed, of about same length as 

 fifth endite, fringed with setae on its caudal margin. Eleventh 

 leg with a small epipodite, fringed with setae, and trace of a pre- 



