516 [April 5, 
Cope. | 
Wadth-of neuralispineatsummiltiae acess eels se cls oe ee OSD 
Wen gthe of ailimma 2 cey ger ase ces eee eii ele eee melo 
This species appears to have been about the size of the Mississippi alli- 
gator. Unfortunately the cranium is unknown, but probably some of the 
jaws and teeth in my possession belong to it. 
From the region above already mentioned. 
METARMOSARUUS FOSSATUS. Gen. et sp. nov- 
Char. Gen. There are numerous vertebrxe in the collection, from the 
median and anterior dorsal parts of the column, which differ from those of 
Clepsydrops and Hpicordylus in their small antero posterior diameter. 
That these all belong to one species, or even one genus, is not probable, in 
view of the many differences which they present. I select one of them 
whose characters are most strongly marked, and designate it as above, with- 
out deciding, as yet, how many of the others which agree with it in some 
respects, may hereafter be associated with it as to species or genus. 
The centrum is a good deal shorter than wide, and like those of all 
the other genera here described, is deeply biconcave. I have not yet ascer- 
tained whether it is notochordal, owing to the state of the specimens. The 
diapophyses project just below the base of the neural arch, and are short 
and with small tubercular facet. There is no capitular facct. The facet 
for the intercentrum is excavated at the anterior extremity of the base of 
the centrum and is quite small. The neural canal is rather large. The 
anterior zygapophyses have a peculiar form, their articular faces being 
directed downwards and outwards. This character, together with the 
form of the centrum and intercentrum, distinguishes this genus at once 
from those previously described. 
Char. Specif. The posterior articular face is a little deeper than wide, 
and has rather thick recurved margins. The sides are concave, and the 
middle line below protuberant (in section), but not keeled. The intercen- 
tral fossa is a transversely oval pit well defined all round, and not inter- 
rupting the contour of the inferior margins of the articular faces. 
Measurements. M. 
(waniterosposterior 2. \2ccj.aaeee Mose Oo 
transverse oehind).. ener O50 
vertical “fe atta ck Slee eae a0 
l 3G lint {ROMs .)¢ ae eee ee 
Diameter of centrum 
Width of intercentrall fossa too. ale v2.5: sceeeteeds ae) eee eeu O 
Expanse of posterior zygapophyses..................-- -025 
About the size of the Dimetrodon rectiformis. 
EMPEDOCLES ALATUS. Gen. et sp. nov. 
Char. Gen. This genus is of the same type as those already described 
as allied to Clepsydrops. I know of it from numerous vertebra, but few of 
which belong to any one individual, four consecutive centra being the 
largest number I have obtained in association. The various specimens 
