cragin.] DESCRIPTIONS OF SPECIES. 109 
> Genus ASPIDOCERAS Zittel. 
ASPIDOCERAS ALAMITOCENSIS C and A. 
PI. XXVII, fig. 2. 
Aspidoceras alamitocensis Castillo and Aguilera, 1895, Bol. Com. Geol. Mex., 
No. 1, p. 43, PI. XXIII. 
A portion of a shell which appears quite identical with this bulky 
ammonite was obtained H miles east of Malone station. It includes 
about a fourth of a volution, belonging mostly to the septate part of 
the shell, but including also a small posterior fraction of the body 
chamber. The septal line is imperfectly shown, but the lateral lobes 
and saddles are large and coarsely dissected, the saddles having 
obtuse, the lobes having sharply pointed terminal divisions; and the 
auxiliaries, (not visible in our specimen) are few, or at least not pres- 
ent beyond a narrow umbilical tract of the whorl. Of the two rows 
of tubercles, only one — that which borders the umbilicus — is shown, 
owing to the condition of the specimen. Traces of low ribs separated 
by broad and shallow valleys and crossing the broadly rounded outer 
side, of the whorl, are distinguishable. The specimen indicates a 
shell at least as large as the largest of the Alamitos specimens whose 
dimensions are given by Castillo and Aguilera. In the matrix with 
it are several imperfect specimens of Exogyra subplicifera. 
YERTEBRATA. 
As compared with the rich invertebrate fauna, the known verte- 
brate fauna of the Malone formation is pitifully meager. 
Besides a few ill-preserved and problematical structures which may 
pertain to Vertebrata, the Malone Hills, 1J miles east of Malone sta- 
tion, have yielded two cycloid fish scales, between circular and quad- 
irate in outline and a little smaller in area than a 1-cent piece; one 
well-preserved hemispherical tooth, about the size of a checkerberry, 
Jof a Pycnodont; and a number of fragments of bones of rather large 
swimming reptiles, which are probably in part those of Enaliosaurs. 
The east slope of Malone Mountain, a mile north of its southern 
end, has yielded Doctor Stanton a shark's spine of indeterminate 
genus. 
While the Upper Jurassic rocks of Potosi, Oaxaca, etc., Mexico, 
have yielded a considerable number of invertebrates — some now 
known, others not yet known, from Texas — they have apparently 
yielded no vertebrate remains of record whatsoever; and the above 
brief notices therefore apparently embrace all that is known of the 
Vertebrata of the Upper Jurassic in Texas and Mexico. 
