EXPLANATION OF PLATE XL 



d, dorsal ; p, pectoral ; j/, pelvic lin. 



Fig. 1. Young Lophiun taken out of the egg just previous to hatching, showing the 

 pelvic fin-fold behind the pectoral. 



Fig. 2. LopHus just after hatching, showing the pelvic fin p' in a jugular position be- 

 low the pectoral, with first dorsal spine appearing as a fleshy process. 



Fig. :5. An older stage, with second ray of jjelvic fin growing out from the base of the 

 first. 



Fig. 4. A still older stage, with two dorsal and two pelvic rays developed. 



Fig. 5. A more advanced embryo, with four dorsal rays and the rudiment of a third 

 pelvic fin-ray. 

 All the figures on this plate are taken from those published by A. Agassiz, but are 



considerably reduced and rendered diagrammatic. 



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