PLATE II. 



Ceeatiocabis Halliana, T. B. J. Sf H. W. Natural size. 



Fig. 1. — Carapace. Mus. Pract. Geol. (Page 26.) 



Fig. 2. — Carapace, segments, and a portion of the appendages. Mus. Pract. 

 Geol. (Page 27.) 



Fig. 3. — Carapace and segments. Mus. Pract. Geol. (Page 28.) 



Fig. 4. — The same(?). Carapace, segments, and caudal appendages. (Possibly 

 C. tyrannus.) Mus. Pract. Geol. (Page 27.) 



