286 PROCEEDINGS OF THE AMERICAN ACADEMY 



along the base of the anal fin, of the pectorals, and of the upper part 

 of the stomach and head. In the youngest stages (Plate III. figs. 

 2, 3) there are two large patches of yellowish brown along the dorsal 

 embryonic fin, four along the ventral, and the outer edge of the pecto- 

 rals is colored in the same manner. In the subsequent stages (Plate 

 III. fig. 4, and Plate 11. fig. 1) the young have the general coloring 

 of the older stages. This seems characteristic of other Cottoids, as in 

 a young Hemitripterus acadianus corresponding to Plate III. fig. 4 ; 

 the brilliant red coloring so characteristic of the adult is the prevail- 

 ing tint of the pigment spots of that early stage. 



Cyclopterus lumpus, Lin. 



(Plates ly. V.) 



In the youngest stage of this species I have had occasion to ex- 

 amine (Plate IV. fig. 1), measuring 4"™, the caudal fin was already 

 partly separated from the dorsal and ventral embryonic fin. The 

 spiny rays were also indistinctly indicated in those fins. The pectorals 

 were large, the rays gradually diminishing in length towards their 

 junction with the sucking disk (the modified ventrals on the abdomi- 

 nal side). The anterior dorsal is formed evidently, as in Lophius, at 

 an early stage, and separates, as in that genus, the anterior and poste- 

 rior parts of the embryonic dorsal fin. The younger stages of Lumpus 

 (Plate IV. figs. 1-4) are noted for the great length of the urostyle. 

 The head of the younger stages is remarkable for its great length 

 and breadth (Plate IV. figs. 1-4). The great prominence of the pig- 

 ment 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 IV. figs. 1 and 3. With 

 increasing age and size (Plate IV. 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 IV. 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 suck- 

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

 become well separated from the caudal fin, which in Plate IV. fig. 4, 

 has nearly completely lost its ganoid shape, having become almost 



