EXPLANATION OF PLATE XIX. 
Fic. 19. Cross-section of Higenmannia virescens (Valenciennes). 
Fic. 20. Cross-section of Sternarchus albifrons (Linnzus). 
Fic. 21. Cross-section of Electrophorus electricus (Linnzeus). 
Fic. 22. Cross-section of Hlectrophorus electricus (Linneeus). 
Fic. 22. Cross-section of Hlectrophorus electricus (Linnzeus). 
Fig. 23. Cross-section of Electrophorus electricus (Linnzeus) near end. 
Tia. 24. Pseudo-electric tissue of Higenmannia virescens (Valenciennes) after Sachs. a. end of tail; b. cross- 
section through same; h. point corresponding to that occupied by the electric organ of Electr ophorus 
electricus (Linnzus); gy. axis of distribution of structural units, which are indicated by c.; d. nerve- 
fibers; (after Sachs ‘Untersuchungen am Zitteraal’’ p. 69). 
Notation oF Figs. 19-23. 
b. S., bundles of Sachs: d., dorsalis; d. t., dorsal thong; H. 0., Hunter’s organ; 1. in., lateralis inferior; 
1. im., lateralis imus; J. 0., large electric organ; J. s., lateralis superior; n. e., notalis externalis; n. 7., notalis 
internalis; p. é. a., pinnalis analis externalis; p. a. 7., pinnalis analis internalis; p. e. o., pseudo-electric organ; 
r. 1. 7., remnant of lateralis imus; S. 0., organ of Sachs; v., ventralis. 
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