336 MEMOIRS OF THE CARNEGIE MUSEUM 
The anterior border of the parts preserved is slightly rounded, but, as it approaches 
the articular end it widens into flattened oblique surfaces which look forward and 
upward and probably represent the points of attachment for the ligaments which 
held the clavicles in position. (See P]. XX XVIIL., Fig. 1.) The ventral surface of 
the scapule antero-posteriorly at the expanded articular ends is somewhat concave. 
Between the point of attachment for the clavicle and the articulation with the 
coracoid the internal border is especially compressed and remains free. 
The clavicles and interclavicular bones were not found with this specimen. 
MEASUREMENTS. 
No. 919. Greatest width of coracoids, transversely...... ...-..cccseseeeceseeeeee 430 mm. 
BS Bil, sf length of articular surface for scapula....................0..- 85 
«919. ae “of straight external border....................0-sseeee INO), 
35 Og, width of scapule, antero-posteriorly.................2::000+ il7f5j, 40 
6 Og, ee length of glenoid articular face 
ComMENTS ON Recent LITERATURE. 
In discussing the age of the Baptanodon Beds Dr. 8. W. Williston® speaks of the 
relationship of Baptanodon and Ophthalmosaurus and makes the statement that the 
two species of Ophthalmosaurus are probably not congeneric and “it is also apparently 
quite true that Baptanodon seems to be as closely allied to the Cretaceous as to the 
Jurassic species.” In a previous paper’ I have shown that O. icenicus (the Jurassic 
form) and Baptanodon are very closely allied, while O. cantabrigiensis is not similar 
in any respect. 
The discovery the past season (1905) by Mr. W. H. Reed of an Ichthyosaurian 
in the Benton Cretaceous is of considerable interest as showing the occurrence in 
North America of this group at a much later period than hitherto supposed. 
Dr. J. C. Merriam, who has examined the fragmentary specimen collected by 
Reed, says: “The centrum is very thin antero-posteriorly and in this respect some- 
what resembles the corresponding centra in Baptanodon discus. . . . When more 
material is available it will be interesting to learn whether this form really repre- 
sents a true Ichthyosaurus or possibly a more highly specialized form of Baptanodon 
than those we know from the Baptanodon beds. Should it be Baptanodon, it will 
* Williston, 8. W., ‘‘ Hallopus, Baptanodon and Atlantosaurus Beds of Marsh,’’ Jour. of Geology, Vol. XIII., No. 
4, May—June, 1905. 
*Gilmore, C. W., ‘‘Osteology of Baptanodon,’’ MmmMorrs OF THE CARNEGIE Museum, Vol. II., No. 2, August, 
1905. 
Merriam, J. C., ‘“ The Occurrence of Ichthyosaur-like Remains in the Upper Cretaceous of Wyoming,’’ Science, 
N.S., Vol. XXII., No. 568, pp. 640-641, November 17, 1905. 
