NILS ROSEN, STUDIES ON THE PLECTOGNATHS, 



13 



Explanation of Plates. 



Plate I. 



Fig. 1. Diagram of the dorsal body-muscles, with Maurer's termi- 



nology. 

 » 2. Body-muscles of Balistes v etui a L. 

 » 3. Spheroides testudineus L. Lateral view of body-muscles. 



The transverse muscles are removed. 

 » 4. Spheroides testudineus L. Ventral view of body-muscles. 



The exteriör layer of m. rectus is removed. 



Plate II. 



Spheroides testudineus L. Ventral view of body-muscles. The 



transverse muscles are removed. 

 Spheroides testudineus L. Ventral view of muscles. 

 Lactophrys trigonus L. Lateral view of body-muscles. 

 » » L. Ventral view of body-muscles. 



» » L. Profound muscles of dorsal and anal 



fins. 



Fig. 10. Mola. 



11. 

 12. 



Plate III. 



Cartilage formed by the coalescence of the tips of 

 the pterygiophores of the dorsal fin. Horizontal 

 section. 



Articulation of the dorsal fin. Transverse section. 



Articulation of the caudal tin. 



Fig. 13. Mola. 



Plate IV. 



Muscles of body and anal, caudal and dorsal fins. 

 Muscles and tendons red. Skeleton black. Con- 

 nective tissue pointed. 



