806 ALLTS. 
EXPLANATION OF PLATE XXXVII. 
Fic. 62. Same as Figs. 60 and 61, but a deeper dissection. The pharyngeal 
bones on the right side of the head and the constrictor pharyngei have been entirely 
removed. On the left side of the head the first two infrapharyngobranchials and 
a part of the third are left in place. The parasphenoid has been partly removed, 
exposing a part of the base of the skull. A part of the eye-muscle canal is seen 
filled with membranous and fatty tissues. The pterygo-palatine arch on the right 
side of the head is partly cut away so as to show the muscles and nerves of the 
orbit. X 1%. 
Fic. 63. Same as above, but still deeper. The median portions of all the vis- 
ceral arches with their associated muscles, the retractor arcuum branchialium in- 
cluded, have been entirely removed. The larger part of the base of the chondro- 
cranium has also been removed. The ventral surfaces of the vertebral column 
and the trunk muscles, of the hypophysis cerebri, the saccus vasculosus, and the 
eyeballs and their associated nerves and muscles, are thus exposed. X 1%. - 


