APPENDIX. 
i ee a ee Principai Characters of American Jurassic 
Dinosaurs ; by Professor O. C. MarsH. Part VII. On the 
Diplodocide, a new family of the Sauropoda. (With Plates 
II and IV.) 
THE Sauropoda are now generally recognized by anatomists 
asa well-marked order of the Sub-class Dinosauria. In the 
previous articles of this series, the main characters of the two 
families of this order (Ailantosauride and Morosawride) already 
named by the writer have been given.* A third family is 
represented by the genus Diplodocus, a study of which, more. 
®specially of the skull, throws light on the whole group of 
Dinosaurian reptiles. 
’ 
THE SKULL. 
The skull of Diplodocus is of moderate size. The posterior — 
Opening is at the apex of the cranium, which from this point 
slopes backward to the occiput. In front of this aperture, 
muzzle, as represented in Plate III, figure 1. i 
_ Seen from the side, the skull of Diplodocus shows five open-— 
) 
Yacuity (b), the nasal aperture (c), the orbit (d), and the lower 
hag poral opening (e) (Plate IV, figure 1). The first of these 
as not 
lag etis Journal, xvi, 411, Nov. 1878; xvii, 86, Jan, 1879; xxi, 417, May, 
S81; xxiii, 81, Jan., 1882; and xxvi, 81, Aug., 1883. = 
Am. Jour. So1.—Turrp Serres, Von. XXVII, No. 158.—Fes., 1884. 
ul : 
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