204 — 



EXPLANATION OF THE PLATES VII -XIII 



PI. VII. Larva of the eel {Angitilla vu/garis) = Leptocephahis Anguillae vulgaris {L. brevirosiris). 

 14. specimens at about the same stage of development (ist stage of transformation). 

 Fig. I — 7 (first series): Variation in size. 

 „ 8 — 14. (second series): Variation in shape. 

 NB. All the figures are about 1 ','2 nat. size. Repi oduclion from photographs of specimens preserved 

 in formaline. 



PI. VIII. Metamorphosis of the Eel {Angui//a vulgaris). 



Fig. I — z: ist stage (Leptocephahts brevirosiris). 

 „ 3 — 6: 2nd stage. 

 „ 7 — 8: 3rd stage. 

 „ 9 — 10: 4th stage. 

 II — 12: 5th stage. 

 I 3 : 6th stage. 

 NB. All the figures are about 1 1/2 nat. size. Reproduction from photographs of specimens preserved 

 in formaline. 



PI. IX. Larvae of various Eels caught by the "Thor" in 1905. 

 Fig. I : Leptoceplialiis spec, (not fullgrovim). 

 „ 2: Leptocephahis Anguillae vulgaris. 

 „ 3 : Tilurus spec. 



„ 4 — 6 : Leptocephalus Synaphobranchi pinnati 

 „ 7 : Tilurus spec. 



„ 8 — 9 : Leptocephahis Congri vulgaris. 

 NB. All the figures are about natural size. Reproduction from photographs of specimens preserve<l 

 in formaline. 



PI. X. Chart, showing the distribution of Leptocephalus brevirosiris (ist stage of the fry of the Eel) W. of 

 Europe during the summer. 



PI. XI. Chart, showing the distribution of transparent Elvers in tlie .Sea (5th stage of the fry of the Eel) 

 during the winter. 



PI. XII. Chart, regarding the ascent of the Elvers, .showing: 



1. the places where Elvers are fished for and used for human food, and 



2. the dale of ascent of the Elvers in the various countries. 



PI. XIII. Ripe male specimen of the Eel {Anguilla v?tlgaris). 

 Fig. I seen from the ventral aspect. 



„ 2 seen from the lateral aspect. 



„ 3 seen from the dorsal aspect. 

 NB. All the figures arc about natural size. 



