32 THE DISCOBOLI. 



the great length of the urostyle. The head of the younger stages is 

 remarkable for its great length and breadth (Plate XII. Figs. 1-4). The 

 great prominence of the pigment spots on the anterior part of the young 

 fish, as far as the base of the dorsal and ventral embryonic fins, gives 

 the young Lumpus a very striking appearance. It resembles somewhat 

 the armored Fishes of the Old Red, and we are strongly reminded 

 of the restorations of Coccosteus in such stages as those of Plate XII. 

 Figs. 1 and 3. With increasing age and size (Plate XII. Figs. 3, 4), the 

 young Lumpus is more uniformly covered by pigment cells, the posterior 

 part of the body becomes less transparent, more fleshy, and it loses its 

 ancient look, resembling more, at this stage (Plate XII. Fig. 4), the young 

 of Batrachus, which may, indeed, be said to be a permanent condition of 

 this stage of Lumpus (with the exception of the absence of the sucking 

 disk in Batrachus). The posterior dorsal and the ventral have become 

 well separated from the caudal fin, which in Plate XII. Fig. 4, has nearly 

 completely lost its ganoid shape, having become almost symmetrical. The 

 urostyle, however, is still marked by its great length. The permanent 

 rays of the median fins are well advanced (Plate XII. Fig. 4) ; the paired 

 fins have not changed materially since the last stage (Plate XII. Fig. 3). 

 There is great diversity in the coloring of the young of Lumpus. In the 

 youngest stages (Plate XII. Figs. 1-3) the head, in a line drawn nearly 

 vertically below the base of the anterior dorsal, is of a light chocolate 

 brown, with a darker brown band extending from the nostrils above the 

 eye to the base of the anterior dorsal. A light blue band extends from 

 the rear of the eye to the top of the operculum, and in front of the eye to 

 the nostrils. A blue spot of similar tint is found at the posterior base 

 of the dorsal, and at the base of the caudal exti'emity of the posterior 

 dorsal. The rest of the body is straw-colored. The young of the stage 

 represented in Plate XII. Fig. 4, were usually of a bright olive green, dark- 

 est towards the dorsal side, with the same blue band extending towards 

 the operculum from the rear of the orbit, with one or two round blue 

 spots above the level of the pectorals along the lateral line. Other speci- 

 mens were of a bluish neutral slate tint, uniformly spotted with darker 

 pigment cells, with the same blue band between the eyes, above the nos- 

 trils, and behind the eyes. This was also the coloring of the oldest of 

 the young specimens caught (Plate XIII. Figs. 1, 3), resembling in general 

 the bluish coloring of the adult, only of a darker tint. 



