PLATE XXVII. 



nov. Part of the ornament 



Part of the ornament 



Fig. 1 a. — Dithyrocaris insignis, sp. nov. Postero- ventral portion 

 of a right-hand valve, x 2. Neilson Collection, marked B. East 

 Kilbride. 



Fig. 1 b. — Dithyrocaris insignis, sp 

 of the valve. X 1 0. 



Fig. 1 c. — Dithyrocaris insignis, sp 

 of the valve. x 60. 



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

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

 Nat. size. Mus. Pract. Geol. Counterpart of Plate XXIV, fig. 1. 

 Kirktonhohne, East Kilbride. 



Fig. 2 b. — D. tricomis, 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. testudinea, Scouler An isolated dorsal crest. Nat. 

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



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

 X 15. 



Fig. 4 a. — D. tricomis, Scouler. A nearly perfect carapace of a 

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



Fig. 4 b. — D. tricomis, Scouler. Side view. \ 



Fig. 4 c. — D. tricomis, Scouler. 



Fig. 4d. — D. tricomis, Scouler. 



Fig. 4 e. — D. tricomis, Scouler. 

 juxtadorsal ridges. X 30. 



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

 Geol., G2G0. Londonderry. (Page 1G8.) 



(Page 160.) 



-(Page 172.) 



Front view. J X 3 4-. 

 Hind view. J 

 Ornament at the dorsal and 



(Page 151.) 



. (Page 174.) 



Nat. size. Mus. Pract, 



