Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
EASTMAN : CARBONIFEROUS SHARKS. Jo 
PLATE 5. 
Clenacanthus spectabilis St. J. and W. Kinderhook Limestone; Mississippi 
Valley. Left lateral aspect of spine referred to the second dorsal fin. 
Original preserved in the U. S. National Museum. (Cat. No. 4845). 
x i. 
Ctenacanthus longinodosus, sp. nov. Kinderhook Limestone; Mississippi 
Valley. Basal portion of spine referred to the first dorsal fin. Original 
preserved in the U.S. National Museum. (Cat. No. 3393). x 4. 
Acanthodes marshi (%), sp. nov. Coal Measures; Mazon Creek, Illinois. 
Fin belonging presumably to a young individual of same species as 
shown in Plate 6, Figure 3, with attached spine and calcified fin-mem- 
brane. Original preserved in Yale Museum. X 4. 
PLATE 6. 
Ctenacanthus lucasi, sp. nov. Kinderhook Limestone; Mississippi Valley. 
Basal portion of spine referred to the first dorsal fin. Original pre- 
served in the U. S. National Museum. (Cat. No. 4844). x 1. 
Ctenacanthus decussatus, sp. nov. Kinderhook Limestone; Mississippi 
Valley. Proximal portion of spine referred to the first dorsal fin. 
Original preserved in the U. S. National Museum. (Cat. No. 4846). 
Oe 
Acanthodes marshi, sp. nov. Coal Measures; Mazon Creek, Illinois. Im- 
pression of nearly complete pectoral fin preserved in counterpart, show- 
ing fin-spine and actinotrichia, but without supporting basal element. 
Original in Yale University Museum, X }. 
PLATE 7. 
Acanthodes marshi, sp. nov. Coal Measures; Mazon Creek, Illinois. Nod- 
ule containing a portion of the dermal covering (shagreen), the granules 
of which are preserved in their natural arrangement, and present the 
structure shown in Fig. 2. Original in Yale University Museum.  X }. 
Acanthodes marshi, sp. nov. Enlarged drawing of some of the shagreen 
granules from the type-specimen shown in Fig. 1. xX $. 
Ctenacanthus solidus, sp. nov. Kinderhook Limestone; Mississippi Valley. 
Proximal portion of spine referred to the second dorsal fin. Original 
preserved in the U. S. National Museum. (Cat. No. 4843). x 4. 
