Cope.] ^^ [August 15, 



It is probably this species which I have figured in the Proceedings of 

 the American Philosophical Society,* and American Naturalist.f under 

 the name of C. heterodittis. It is the most abundantly represented in 

 my collection. In the specimen figured in the American Naturalist, 

 the probable scapula is visible on both sides, but the coracoid is concealed 

 by the pectoral scuta. 



Cricotus hypantricus, sp. nov. 



This Embolomere is probably represented by two individuals, which are 

 of larger size than any species which have hitherto come under my no- 

 tice, one of them very much larger. It is only the smaller specimen 

 which is accompanied by the astragalus. Both of them display the hypan- 

 trapophyses already mentioned in remarks on the genus under the head 

 of C. crassidieus. 



As already pointed out in the key of species, the dorsal intercentra in 

 the G. hypantricus are stout and not narrow above, but the thickness in- 

 creases rather than diminishes upwards. They thus differ from the cor- 

 responding intercentra in the O. heteroclitus. In many of the dorsal in- 

 tercentra the dense external layer which covers the inferior face continues 

 upwards to an apex, the articular surfaces of the two ends meeting so as 

 to exclude the former. This is also the case in the 0. crassidiscus. The 

 centra have the abbreviated form characteristic of the genus, and the for- 

 amen chordae dorsalis is present, but is smaller than the G. heteroclitus. 



The supposed astragalus is oblong ; proximal:]: border longer than the 

 distal, which is separated by an obtuse angle from the ectad ; distal en- 

 tad not reaching superior surface of bone, long, extending inwards below 

 the revolute proximal part of the entad face, from which it is separated 

 by a narrow oblique groove. Proximal and distal entad separated by 

 notches of the two faces ; a ridge the length of the bone below. 



Measurements. M. 



Diameters of centrum of indi- f anterposterior 015 



vidual with astragalus. I transverse 028 



„. ^ f . 1 f anterposterior 038 



Diameters of astragalus •; „^„ 



(.transverse 029 



Diameters of centrum of r anteroposterior 018 



: r an 

 ttra 



larger individual. I transverse 038 



-r,. . J. ^. , , r- 1 f anteroposterior .013 



Diameters adjacent interceutrum of do. { * „„„ 



I transverse 038 



REPTILIA. 



Clepsydrops leptocephalus, sp. nov. 



This species is represented by almost the entire skeleton, the principal 

 deficiency being that of the scapular arch and the anterior limbs, with the 



* 1881, pi. ii, figs a-?j. 



t 1884, p. 39, pi. v and fig. 7. In pi, v, flgs/and g represent the C. heteroclitus. 



X I determine the ends of this specimen from a foot of Eryops. 



