OF ARTS AND SCIENCES. 299 



EXPLANATION OF THE PLATES. 



PLATE I. 



Labrax lixeatus, Bl. §• Sch. (Roccus, Gill.') 



Fig. 1. Young Labrax measuring 3.5™™ in length. 

 " 2. Slightly older than fig. 1, measuring ■A'"™ in length. 

 " 3. Still more advanced, measuring nearly 5'"™ in length. 

 " 3a. Tail of young Labrax somewhat older than stage of fig. 3, with a 



dorsal line of pigment spots. 

 " 4. Young Labrax in which caudal is forming, 8™™ in length. 

 " 5. Somewhat more advanced than fig. 4. 



PLATE IL 



Fig. 1. Young CoTTus gr<enlandicus, somewhat older than stage of Plate 

 III. fig. 5, measuring 8™™ in length. 

 " 2. Profile view of young Cottus measuring 1L5™™ in length. 

 " 3. Young Labrax 16'"™ in length. 

 " 4. Young Labrax 26™™ in length. 

 " 5. Young Blue Fish (Temnodon saltatoe) measuring 9™"» ia length. 



PLATE m. 



Cottus grcenlandicus, C. §* F. 



Fig. 1. Egg of Cottus found floating on the surface. 

 " In. First trace of pectorals of young Cottus still within the egg. 

 " 16. Somewhat older stage of lateral fold. 

 " Ic. Still older stage than fig. 1 b, still within the egg. 

 " 2. Young Cottus just hatched, measuring 2.5™™ in length. 

 " 3. Slightly older specimen, third day after hatching, seen from above. 

 " 4. Young Cottus, somewhat older than preceding stage, measuring 3™™ 



in length. 

 " 5. Young Cottus eleventh day after hatching. 



PLATE IV. 



Cyclopterus lumpus, Lin. 



Fig. 1. Young Lumpus, seen in profile, measuring 4™™ in length. 

 " 2. Same seen from above. 



" 3. Young Lumpus, somewhat older than preceding stage, seen in profile. 

 " 4. Profile view of young Lumpus measuring 5™™ in length. 

 " 6. Profile of young Lumpus measuring 10™™ in length. 



