. On the anatomy of vertebrates [electronic resource] . The rami of the jaw converge and are united at a sym-physis of more than half an inch in length ; there they becomeexpanded and flattened, then again disunite, and are continuedforward as two spatulate processes, b, which diverge from eachother to their broad rounded terminations,and are situated just behind the inflectedextremities of the similarly separated pre-maxillaries, ib. A, and fig. 205,22. On theouter sides of the upper surface of thebroad symphysis are the long and narrowsockets of the two anterior trenchant hornyteeth. The Mon
. On the anatomy of vertebrates [electronic resource] . The rami of the jaw converge and are united at a sym-physis of more than half an inch in length ; there they becomeexpanded and flattened, then again disunite, and are continuedforward as two spatulate processes, b, which diverge from eachother to their broad rounded terminations,and are situated just behind the inflectedextremities of the similarly separated pre-maxillaries, ib. A, and fig. 205,22. On theouter sides of the upper surface of thebroad symphysis are the long and narrowsockets of the two anterior trenchant hornyteeth. The Monotremes differ from theMarsupials in the absence of the inflectedprocess developed from the angle of thelower jaw. The exoccipitals, fig. 205, 2, b, andsuperoccipital, ib. 3, are separate in theskull of the young Ornithorhynchus herefigured of the natural size. The mastoid,ib. e, e, contributes to part of the occi-pital surface, and advances anteriorly to the small cranial expan-sion of the squamosal at /. This expansion does not exceed vol. 11. y 205. Skull of young Ornithorbynclius,nat. size. 322 ANATOMY OE VERTEBRATES. in size the glenoid process, which it meets at a right angle, andfrom the union of which the zygomatic process is continued for-ward to join the malar process of the maxillary: there is no dis-tinct malar bone. The parietal, ib. 7, is long and large, undividedby a sagittal suture, from the place of which a bony falx isdeveloped internally, fig. 204, b. The frontals are small, and infig. 205, h, h, retain the frontal suture. The nasals, ib. n, n, arelong and large : they contribute to the rim of the orbit, and formthe posterior half of the large bony nostril, p. The maxillary, , after sending off a process which curves over the antorbitalforamen, extends forward, diverging from the nasal to form theangular fissure which receives the premaxillary, o, 22. Each ofthese bends inward at the anterior extremity, but is separatedby a wide space. There is a small pr
Size: 1052px × 2375px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubject, booksubjectbirds, booksubjectfishes
