m 



G. R. Wieland — On Marine Turtles. 



sacral series presents no marked peculiarity, while the caudal 

 series is rather short. The arches of the first eight to ten 

 candals are free, but those of the- remainder of the series are 

 strongly fused to their centra. It is not likely that the tail 

 could have been so freely moved as might be implied from the 

 over strong curve in the restoration. 



Fig. 7. 



Figure 7. — Archelon ischyros, x 1/36. Dorsal view of original type. 

 It is not necessary to give in detail the exact outline of the restored portions. 

 The skull is outlined from a cotype, and the right hind flipper shown in 

 the normal outline was not present beyond the proximal half of the tibia 

 and fibula, having, as explained in the text, been bitten away in the early 

 life of the turtle. 



Note on the mid-line following the nuchal seven larger plates followed by 

 four smaller ones and then the pygal. All these eleven plates intervening 

 between the nuchal and the pygal are adjudged to be epineurals seated on 

 the greatly reduced neural series which did not, as in all other turtles except 

 Dermochelys, normally come into view at all. 



Observe the nine pairs of fully developed ribs, of which the first large pair 

 is the second, the small first pair not coming into view. Infra- and supra- 

 peripherals not indicated. 



The Carapace. — The nearly orbicular form of the carapace 

 is a striking feature. The nuchal is very large and very thin, 



