( lfi« ) 



1. Tlie frontal region is flat, broad, passing- into the short snont, its greatest 

 width being more than one-half of the distance between the tympanic condyles. 

 2. The occipital crest jinijccts far beliind the level of the mastoid, bnt is only little 

 raised above the level of the np|)cr snrface of the head. :>. The tymjiaiiic case 

 with the mastoid is prodnced far backwards, the hind margin of the paroccipital 

 being dec{)ly excised.* 4. There is no cavity in front of the occipital condyle, 

 the space between the condyle and basi-.splienoid simply shelving downwards 

 from a well-marked transverse ridge towards the condyle. .5. The tnberosity for 

 the insertion of a part of the temporal mnscle is not mnch developed, rough, and 

 separated by a shallow groove from the zygomatic arch. 0. Tympanic cavity very 

 large ; the onter tymjjanic rim semicircular ; notch for the passage of the enstachian 

 tnbe rather shallow. 7. The ridge which runs from this notch to the stapedial 

 foramen, and to which the columella is attached, projects as a broad, sharp lamella 

 into the cavity. S. Front margin of the intermaxillary considerably in advance of 

 that of the frontal, the nasal aperture oblicpiely sloping downwards, snb'iuadrangular, 

 about as deep as wide. 0. On the palatal view the postero-interior half of the 

 choanae is left uncovered by the alveolar lamellae of the maxillaries. 10. Tlie 

 posterior portion of the intermaxillary jnerced by two foramina. 11. Palatal 

 region deeply concave, divided along its middle by a high longitudinal crest ; the 

 triangular space of which the foramina jialatina and the anterior extremity of the 

 vomer form the points, is conspicuously longer than broad, the distance between 

 the foramina being 28 mm., and their distance from the end of the vomer 3.) mm. 

 Pterygoid crests high ; tlattened in front, they soon become sharp-edged ; they 

 converge gently, their posterior roots being still 24 ram. distant from each other. 

 12. Anterior snrface of the tympanic pedicle deeply e.Kcavated. 13. Lower jaw 

 as in T. ephippium. 



The .«/•//('; of tlic feninle (PI. XIX, Fig. b) is mutilated behind, the occipital 

 condyle with the parts round it having been cut away to extract the brain. But 

 fortunately so much has been preserved that the complete agreement with the 

 skull of the male is fully proved. (1) The frontal region is a little less wide, its 

 greatest width being only one-half of the distance between the tympanic condyles ; 

 (2) the occipital crest is conspicuously shorter, less produced backwards ; but (11) 

 the structure and form of the palatal region is identical with that of the male, 

 the distance between the foramina palatina being 23 mm., and their distance 

 from the end of the vomer 29 mm., measurements which agree with those found 

 in the tyj)e. 



Cercical vertebrae (male). — Testtido galapagoensis is one of the slender-necked 

 races; less so than T. uhing<lonii, it approaches T. ephippium in the length of the 

 neck, as may be seen from the following measurements : — 



* The reference to the figure illustrating? this part in T. tpfnjipii/iu in Oigantit' Land Torti'tscn, p. 83, is 

 erroneously given as fig. A. a., insteatt of fig. C.a. 



