﻿Description of Plate IX. 



Page. 



Fig. I. Burrow of larva, showing arrangement of mud particles (recent), . 152 



Fig. 2. Same uncovered, showing excavation, . . . . . . 152 



Fig. 3. Burrows made by animalcules in muddy water (recent), . . 1 53 



Fig. 4. Fossil burrow, described as Trichophyctis lanoswn, M. and D. The 

 broken end was similar to the entire one, but was lost in getting the 



specimen from a large slab. (Collection of C. L. Faber.) . . 158 



Fig. 5. Dendrograptus gracillimum. — Described as Psilophyton gracillimum, 



Lesquereux (after Dana), . . . . . . . .160 



Fig. 6. Buthotrephis gracilis, Hall (after Hall), 160 



Fig. 7. Lockeia siliquaria, James, . . . . . . . 161 



Fig. 8. Inocaulis flabellum.— Described as Licrophycus fiabellum, M. and D. 



(Collection Cin. Soc. of Nat. Hist.) 164 



