244 University of Kansas Geological Survey. 
relations with Professor Marsh began, he himself did no field work, 
his knowledge of the formations being derived from a few tran- 
sient and hasty visits to the different fields where his collectors 
were at work. Mr. Hatcher has already mentioned the extent of his 
personal explorations of the Laramie Cretaceous, which may be 
taken as a sample of all the field work done by himself. His refer- 
ence to the personal dangers encountered from hostile Indians is 
amusing in the extreme to all those who know the facts. I think 
that I can say without fear of dispute by those who know the facts 
that Prof. Marsh never ran any greater danger from Indians than 
when he entertained Red Cloud at his home in New Haven. This 
statement I think is called for in justice to his collectors who did 
expose themselves to real and often imminent dangers from hostile 
Indians, but who were rarely or never mentioned by him in his pub- 
lications. And of these mention should especially be made of the 
late Professor Mudge, the veteran Kansas geologist. 
A correct list of the various species and genera of Kansas Cre- 
taceous vertebrates can not yet be given. Many species have 
been described which will have to be abandoned. Our knowledge 
of the fishes is the most incomplete and fragmentary, notwith- 
standing the extraordinary abundance of their remains. I can say 
but very little regarding their distribution in the different beds, 
inasmuch as I have collected but few from the lower deposits. In 
general they are infrequent in the Rudistes beds, though remains 
are found quite to the Fort Hays deposits. A collection of species 
of Ptychodus teeth, in which the largest grinders measured three 
inches in length and which f[ have not yet succeeded in determining, 
was obtained some years ago from near the base. There were 140 
in the set. ‘The same species in isolated specimens, or in groups of 
a dozen or more has been obtained more recently from these beds, 
but the species has never yet been found in the Hesperonis bed. 
Six genera of Mosasaurs have been referred to the Kansas Nio- 
brara—Clidastes, Tylosaurus, Platecarpus, Holosaurus, Sironectes 
and Baptosaurus. The last two I have never seen, but, though 
Merriam’s determination of Baptosaurus is based upon slight ma- 
terial, it seems authentic. The genus must occur very rarely and 
possibly comes from the Pierre deposits, which have always hereto- 
