The sturgeons are the nearest living relatives of the 
Folyodontidae, and, since sturgeons have snouts about the same 
size as at portion of the Folyodon snout between the barbel and 
the eye (which we have already shown grows at the same rate as the 
rest of the body) we may look on the remainder of the Folyvodon 
rostrum as something added to the essential organization of a 
sturgeon-like fish. Since this added part appears late in develop- 
ment and is recognizable only insofar as it grows faster than the 
rest of the body, it may be considered as a sort of benign tumor 
which has become partially fixed in its characteristics and is in 
some degree useful as a bearer of sense organs for the detection of 
food. Like a tumor it may be removed without seriously hampering 
the welfare of the individual since we have found a number of 
specimens with various fractions of the rostrum cut off and healed 
over, as far back as the barbels. 
BIBLIOGRAFHY 
Barbour, Thomas. 1911 The smallest Folyodon. 
Biol. Bull. Vol. 21, pr. 207-208. 
Cope, E. D. 1883 A new Chondrostean from the Kocene. 
Amer. Nat, Vol. 17, pr. 1152-1153. 
1885 Eocene paddle-fish and Gonorhynchidae. 
Amer. Nat. Vol. 19,. pr. 1090-1091. 
1886 On two new forms of Folyodon and Gonorhynchid 
fishes, fromm the Eocene of the Rocky Mountains. 
Mem. Nat. Acad. Sci. Vol. 5, pr, 161-1605. 
Danforth, C. H. 1911 A 74 mm. Folyodon. 
Biol, Bull. Vol. 20, pp. 201-204, 
Dean, Bashford. 1895 Fishes, living and fossil, 
Columbia Univ. Biol. Series. III Macmillan and Co. 
Huxley, J. S. 1932 Froblems of relative growth. 
Methuen & Co., Ltd., London. 
Nichols, J. T. 1916 A large Folyodon from Iowa. 
Copeia. No. 34, Pp. Sd. 
Stockard, C. Re. 1907 Observations on the natural history of 
Folyodon spathula. 
Amer. Nat. Vol. 41, pps 755-766. 
Thompson, David H. 1933 The finding of very young Folyodon. 
Copeia No. l, pp. 51-35, 
