PLATE XXVIT. 



Fig. 1 a. — Ih'fhi/yocnris ins'ujnis, sp. nov. Postero-ventral portion 

 of a right-haml valve. X 2. Neilsou Collectiou, marked B. East 

 Kilbride. 



Fig. 1 I). — Dithyrocaris insignis, sp. nov. Part of the ornament 

 of the valve. X 1 0. 



Fig. 1 c. — Diflu/rocaris insignis, sp. nov. Part of the ornament 

 of the valve. x 60. 



Fig. 2 a. — D. tricorais, Scouler. Natural impression of the " 

 postero-ventral portion (with its inturned edge) of the right valve. 

 Nat. size. ]\Ius. Pract. Geol. Counterpart of Plate XXIV, fig. 1. 

 Kirktonholme, East Kilbride. 



Fig. 2 b. — L. tricornis, Scouler. Ornament from the sides of 

 the thin ridge near its junction with the postero-ventral margin. 

 X 30. 



Fig. 2 c. — Part of the same. X 50. 



Fig. 3 a. — D. testucUnea, Scouler An isolated dorsal crest. Nat. 

 size. Neilson Collection, marked H, Kirktonholme, East Kilbride. 



Fig. 3 J). — D. testudinea, Scouler. Part of the ornament. 

 X 15. 



Fig. 4«. — I). t)-irornis, Scouler. A nearly perfect carapace of a ' 

 small individual. Nat. size. Neilson Coll., marked F. East Kilbride 



Fig. 4 b. — D. tricornis, Scouler. Side view 



Fig. 4 r. — I), tricornis, Scouler. 



Fig. 4(/. — D. tricornis, Scouler. 



Fig. -ie. — D. trirornis, Scouler. 

 juxtadorsal ridges. X 30. 



Fig. 5. — D. Colei, Portlock. A small specimen 

 Geol., 6260. Londonderry. (Page 168.) 



(Page 160.) 



Front view. *■ X 3 -{-. 

 Hind view. 

 Ornament at the dorsal and 



(Page 172.) 



(Page 151.) 



(Page 174.) 



Nat. size. Mus. Pract. 



