320 ALUS. [Vol. XVIII. 



EXPLANATION OF PLATE VIII. 



Fig. 45. Lateral view of the left clavicle and primary shoulder-girdle, 

 with all the muscles removed. X 2. 



Fig. 46. The same, with the abductor superficialis alone removed. X 2. 



Fig. 47. Dermal ray of the pectoral fin, showing the attachment of the 

 muscles. X 4. 



Fig. 48. Three views of the propterygial ray of the pectoral fin. X 4. 



Fig. 49. Lateral view of the left clavicle, the sternum, and the fifth 

 cerato-branchial, with the associated muscles. X 2. 



Fig. 50. Internal, or mesial view of the left clavicle, the primary 

 shoulder-girdle and the accessory bones, with all the associated muscles re- 

 moved. X 2. 



Fig. 51. The same, with the associated muscles; the superior division 

 of the adductor profundus has been cut and turned backward. X 2. 



Fig. 52. Ventral view of the left eyeball and its associated muscles; the 

 posterior portion of the rectus internus removed. X 2. 



Fig. 53. The lachrymal and suborbital bones, showing the lateral canal 

 and the nerves innervating it. X VA. 



