4 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Testudo darwini new species. 



Type. — Adult male. California Academy of Sciences No. 8108. James 

 Island, Galapagos Archipelago. R. H. Beck and Joseph R. Slevin. 

 July 31, 1906. 



Diagnosis. — No nuchal; gulars paired; fourth cervical vertebra 

 biconvex;^ carapace high, elongate, somewhat dome-shaped but high 

 in front; posterior declivity beginning about middle of third verte- 

 bral; height at nuchal notch more than 41% (45%) of straight length; 

 difference between percentages of height at third vertebral and at 

 nuchal notch more than 9 (10); carapace not saddle-shaped, width 

 at margin of junction of second and third marginals 55%; width 

 over curve in male not greater than length over curve; vertical 

 distance from lower surface of plastron to lower edge of lateral 

 marginals moderately great (9%); general size large, straight length 

 38 inches; shell heavy; pectoral plates forming a suture on median 

 line; the sum of the measurements of the length over curve, length 

 of plastron, height at nuchal notch, and height at third vertebral, 

 equals or exceeds the sum of the measurements of the straight 

 length, straight width, and width over curve; jaws and throat black. 



Testudo chathamensis new species. 



Type. — Skeleton of adult male. California Academy of Sciences No. 

 8127. Found in a cave on Chatham Island, Galapagos Archipelago. 

 R. H. Beck and Joseph R. Slevin. February 12-14, 1906. 



Diagnosis. — No nuchal; gulars paired; fourth cervical vertebra 

 biconvex; carapace depressed, front elevated in male; height at 

 nuchal notch less than 41% of straight length (male 34, female 27%); 

 male flat-backed, female dome-shaped, difference between percentages of 

 heights at third vertebral and at nuchal notch 6 in male, 24 in female; 

 carapace of male slightly saddle-shaped but broad, width at margin 

 of junction of second and third marginals 53% in male; anterior 

 marginals but little everted; length over curve in male 112%, female 

 126%; vertical distance from lower surface of plastron to lower 

 edge of lateral marginals small, 4% in male, 6% in female; general 

 size moderate, straight length in male 35.25 inches, female 22.5 inches; 

 pectoral plates much reduced, not meeting on mid-line; jaws and 

 throat of female black. 



Testudo phantasticus new species. 



Type. — Adult male. California Academy of Sciences No. 8101. Nar- 

 borough Island, Galapagos Archipelago. R. H. Beck. April 5, 1906. 



'It is probable that this is the normal arrangement in all the races of the Galapag-os 

 Islands. The third cervical vertebra has been found biconvex in the types of T. galaiiago- 

 ensis and T. becki; but in seven specimens of the latter the fourth is biconvex, as in other 

 races. 



