*Communicated by Prof. E. S. Goodrich, M.A., F.R.S., F.Z.S.
Some Aspects of the Cranial Morphology of Rana grayi Smith
Article first published online: 21 AUG 2009
Proceedings of the Zoological Society of London
Volume 103, Issue 3, pages 715–734, September 1933
How to Cite
Toit, C. A. d. (1933), Some Aspects of the Cranial Morphology of Rana grayi Smith. Proceedings of the Zoological Society of London, 103: 715–734. doi: 10.1111/j.1096-3642.1933.tb01616.x
- Issue published online: 30 OCT 2009
- Article first published online: 21 AUG 2009
- Received January 14, 1933: Read May 9, 1933.
Only the points in which the cranial morphology of Rana grayi differs from that of the common European species of Rana will be given here.
- 1The anterior process of the crista subnasalis is comparatively long and projects forwards beyond the superior prenasal cartilage.
- 2A ventromedian process of the crista subnasalis appears in the palate, in this way separating the partes palatinæ of the premaxilla and the maxilla from each other.
- 3In the one specimen both the foramina frontalia are absent; in the other the normal condition obtains.
- 4The plica obliqua, which is poorly developed, is suspended from the cartilago obliqua and not from the tectum nasi.
- 5The posterior niche-like portion of the vestibulum is practically absent.
- 6The two Gauppian “Wülste” are both present, but they are not demarcated sharply from each other.
- 7The recessus alaris and the infundibulum are smaller than in the European Rana.
- 8The cavum principale has a small ventromedian recess.
- 9An infundibular vestige of the recessus sacciformis is present.
- 10The musculus lateralis narium is slightly different from that of the European Rana.
- 11A small prechoanal pouch is present.
- 12The septomaxillary consists of an anterior unpaired portion which has three posteriorly directed processes.
- 13The nasals are much smaller than in the common European species of Rana.
- 14A peculiar cartilaginous plate, which is connected synchondrotically to the solum nasi, occurs on the ventral surface of the os en ceinture.
- 15A little further backwards a small cartilaginous cyst appears on either side of the os en ceinture.
- 16Both the parasphenoid and the fronto-parietals are indented anteriorly.
- 17The exoccipital and the prootic do not fuse with each other.
- 18Rana grayi possesses a so-called “Mundwinkeldrüse” situated between the palatal and the facial portions of the maxilla. The gland consists of adenoid tissue and has a lumen which opens into the buccal cavity.
- 19The pterygoid fuses with the processus oticus and with the processus basalis.
- 20In the one specimen the quadratomaxillary acquires a bony connection with the paraquadrate.
- 21A delicate rod-like cartilage, which is connected synchondrotically to the symphysial cartilage, occurs on the ventral surface of the pars mentalis of the dentary.