THE GALAPAGOS TORTOISES. 289 
and more rounded. Between the anal plates the notch is more shallow; gulars 
and anals are widened, the former have thickened upward, the latter are swollen 
downwards. Along each side of the medial concavity there is a great rounded 
prominence. An extreme form of the female in medium size is that shown on 
Plate 33, a more common form on Plate 32. 
Specimens of about three times the length of the types are figured in Plates 
29, 30, 31, 35. They emphasize the tendencies prominent on those of the 
medium sizes besides indicating others acquired on approach of maturity or 
depending on age, together with those dependent wholly or partly on sex. In 
the majority these features will be sufficiently evident from the illustrations. 
The large females on Plates 31, 35 as compared with those of the smaller group, 
Plate 32, have more fullness or roundness in the vertebral and in the costal 
plates and have much greater concavity in the sternum. They are even more 
concave than in the male, Plates 29, 30, fig. 3; the latter is more elongate and 
more depressed on the back and a trifle narrower across the humeral region. 
Being less deep in the sternal concavity may be a peculiarity of this specimen 
as the difference is not great. Plate 28, fig. 1 and Plate 31 pertain to the 
female described in Dr. Jackson’s article, The anatomical description of the 
Galapagos tortoise, Boston Journal of Natural History, 1837, 1, p. 443. Plate 
29 is the male discussed in the same article; it is outlined on Plate 30, from 
Giinther’s figures in the Nov. Zool., 1902, 9, Pl. 16 and 17. 
These specimens were secured by the U. 8. 8. Potomac. Santa Maria 
(Charles) was the only island of the group visited. In the latter part of May, 
1834, the vessel was at Boston, and in June the donation of “two gigantic 
Galapagos tortoises (living) weighing near three hundred and twenty pounds 
each, by Capt. John Downes (U.S. Navy) is recorded by the Boston Society of 
Natural History. The Potomac was at Santa Maria from August 31 to Sep- 
tember 10, according to Reynolds’s account, p. 547, ‘“‘a large number of the crew 
were daily on shore after terrapin, and frequently exposed throughout the day 
to a hot sun, with these immense animals on their backs, travelling over the 
broken lava.’”’ The male of the Downes and Jackson specimens was examined 
by Baur and became the type of his 7’. galapagoensis. Afterward it crossed the 
Atlantic and was described and figured by Ginther, 1902. The photograph, 
Plate 35, a fine specimen inscribed with the legend “Snip Apreain 1835 Bj. 
Cuark Master,” is probably from a native of the same island, Santa Maria. 
The ApicarL was a whaling vessel from New Bedford, Mass. The specimen is 
No. 11064 M. C. Z., received from the Boston Society of Natural History in 
exchange. 
