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criterion to which the judicious naturalist finds it wise or ex- 
pedient to appeal. 
EXPLANATION OF PLATE VI. 
Fig. 1. Longitudinal section of eye of Stomias anguilliformis x 280, show- 
ing the inner vitreous body ( x ), and the anterior chamber with its 
transparent lens (/) : r, retina; n, nerve; p, pigmented layer; 
ir, ( iris-like ’ constriction. (Ussow, fig. 10, B.) 
Fig. 2. Figure of Argyropeleeus hemigymnus x 2. (Leydig, i. 5.) 
Fig. 3. Longitudinal section of organ from abdominal region of ditto, 
magnified highly. (Leydig, iv. 25.) 
Fig. 4. Two of the mother-of-pearl organs from the side of the body of 
Scopelus Humboldti, seen in reflected light, slightly magnified. 
(Leydig, vii. 41.) 
Fig. 5. Organ from the nasal region of Ichthyococcus ovatus, longitudinal 
section, highly magnified, chiefly to show the entrance of the 
nerve. (Leydig, vi. 33.) 
