PLATE 5. 



Fig. 1. 401. 6. BUTHOTUEPHIS GRACILIS. ( Pog- 18-) 



la. A small delicate specimen of this species The engraving represents the branches rather too slender and 



acute. 

 1 4. An elongated stipe with numerous branches. 

 1 c. A fragment with several branches wliicli are again stibdivided. 



1 d. A large individual having fewer branches in proportion to its size, than the preceding, and appvo.xiuiating 



in cliaracter to the succeeding forms. 



Fig. 2. 402. 7. BUTHOTREPHIS GRACILIS, VUr. INTERMEDIA. ( Pag. 19.) 



2 a. A slender specimen with few branches. 2 6. A more rigid specimen with numerous branches. 



Fig. 3. 403. 8. BUTHOTREPHIS GRACILIS, Var. CRASSA. { Pag. 19.) 



3 a, b, c, are common forms of this species in its proper and coarser varieties. 



3 d. A large specimen, with the branches extremely diverging and mostly simple. 



