OCR Text |
Show 1868.] PROF. H U X L E Y ON THL* A L E C T O R O M O R P H A E . 301 Fig. 6. The dorsal aspect of the pelvis of Gallus domesticus. 7. The dorsal aspect of the pelvis of Tetrao urogallus. (The letters as before.) In the Tetraonine or Grouse type, on the other h a n d- I. The postacetabular region is very broad (fig. 7, p. 301); the ilia are truncated nearly opposite the end of the sacrum, and it is the external angle of the posterior edge of the ilium which is rather the longer. 2. The ulnar and distal edge of the basal phalanx of the second digit is produced ; and the phalanx of the third digit has a strong basal tubercle. 3. The anterior margin of the deltoid crest is less oblique, and the angle of the crest is sharper and more prominent. 4. The hypocleidium has straight edges and a triangular form, the apex of the triangle being directed forwards. 5. The tarso-metatarsus is not half as long as the tibia. 6. The mandibular foramen is very large. The two series of forms meet among the Partridges and Quails- Perdix* lying on the Tetraonine, Caccabis, Rollulus, Francolinus, and Coturnix on the Galline side of the boundary. * This has already been pointed out by Mr. Parker, " Gallinaceous Birds and Tinamous" (Trans. Zool. Soc. v. p. 155). |