1426 Explanation of the Plates. [Dec. 



Plate VII. 

 Fig. 1. Symbranchus caligans. Natural size. 



2. Head. Magnified. 



3. Dentition and Tongue. Magnified. 



Plate. VIII. 

 Fig. 1. Alutarius barbatus. Natural size. 



2. Ostracium tesserula. Natural size. 



3. Ostracium tesserula. Vertical section. Natural size. 



Plate IX. 

 Fig. 1. Triacanthus strigilifer. Natural size. 



2. Scale of Triacanthus strigilifer. Magnified. 



3. Scale of Triacanthus biaculeatus. Magnified. 



Plate X. 



Tetrodon naritus. {Young.) Natural size. 



Plate XI. 

 Fig. 1. Hippocampus mannulus. Natural size. 

 2. Hippocampus comes. Natural size. 



Plate XII. 

 Fig. 1. Temera hardwickii. (Young male.) Natural size. 



a. a. The electric organs, b. Cartilaginous fascicles, c. Cuta- 

 neous nerve, d. Abdominal cavity. 

 Fig. 2. Temera hardwickii. {Young male, 1 foot in length.) 

 Brains, medulla oblongata and anterior part of spinal cord, 

 viewed from above. 

 a. Left spiracle, b. c. Two branches of Trigeminus, supplying 

 the anterior part of the left electric organ, d. e. Two branches 

 of Pneumogastricus, supplying the posterior part of the left 

 electric organ. 

 Fig. 3. Cysteocercus temer^e. Magnified {~ single lens.) 



Plate XIII. 

 Fig. 1. Corythobatus echinatus. Natural size. 



2. Dentition. Magnified. 



3. Vertical section. Natural size. 



Plate XIV. 

 Rhinobatus ligonifer. (Young male.) Natural size. 



