. Breviora. 1965 AUDITOEY REGION OF CLADOSICTIS anterior two-thirds of this structure is formed by the alisphe- noid. Antero-externally, this portion is suturally united with the squamosal (part of this area is broken away in the specimen). Medially, there is a long, fairly wide and deep depression be- tween the basicranium and the alisphenoid, which is roofed by the pars petrosa. The Eustachian tube opened into the posterior portion of this depression and passed forward within it. On the 1 u /^^ •fen. r.''. Fig. 1. Cladosictis lustratus Ameghino. Ventral view of incomplete cranium. Pri
. Breviora. 1965 AUDITOEY REGION OF CLADOSICTIS anterior two-thirds of this structure is formed by the alisphe- noid. Antero-externally, this portion is suturally united with the squamosal (part of this area is broken away in the specimen). Medially, there is a long, fairly wide and deep depression be- tween the basicranium and the alisphenoid, which is roofed by the pars petrosa. The Eustachian tube opened into the posterior portion of this depression and passed forward within it. On the 1 u /^^ •fen. r.''. Fig. 1. Cladosictis lustratus Ameghino. Ventral view of incomplete cranium. Princeton University no. 15705, X2. Abbreviations: al., alisphe- noid; al. b., alisphenoid bulla; Eu., opening for Eustachian tube; , posterior carotid foramen; , foramen lacerum posterius; /. ov., foramen ovale; fen. r., fenestra rotunda; p. mas., pars mastoidea of periotie; p. p., paroccipital process; p. pet., pars petrosa of periotie; r. e., epitympanic recess; sq., squamosal; ty., tympanic. broken right side of the specimen a natural section of the ali- sphenoid portion of the bulla is preserved. This is revealed as a deep, oval chamber situated almost entirely within the lateral wall of the cranium. It is separated from the rather large, circular epitympanic recess by a low ridge formed by the alis- phenoid anteriorly and the squamosal posteriorly. The remain- ing third of the bulla is formed by the periotie, which meets the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
Size: 1669px × 1497px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversitymuseumofcomparative, bookcentury1900
