Vol. II, Pt. I] VAN DENBURGH— GALAPAGOS TORTOISES 355 



to 40%) of straight length; diflference between percentages 

 of heights at third vertebral and at nuchal notch more than 

 17 (18 to 28) ; carapace dome-shaped, very broad anteriorly, 

 width at margin of junction of second and third marginals 

 not less than 53% (53 to 71%); first marginals not everted, 

 their most prominent points separated by less than 25% (18 

 to 24%); length over curve not less than 125% (126 to 

 141%), usually greater than width over curve; vertical dis- 

 tance from lower surface of plastron to lower edge of lateral 

 marginals great, 7 to 11%; general size large, straight length 

 to 41.4 inches; plastron long, 77 to 92%; plates generally 

 striated; pectorals forming a suture on median line; eighth 

 marginal plate not reduced, with a considerable superior bor- 

 der; lower jaw and throat in males not marked with yellow. 



