THE DISCOBOLI. 33 



" The intermediate stages varied greatly in coloring ; some were of a 

 yellowish brown spotted with chocolate-colored patches, with light greenish 

 bands behind the eyes, and five rounded spots of the same color along the 

 lateral line, and a similar number of larger spots along the base of the 

 posterior dorsal, extending, in some specimens, along the median dorsal 

 line of the body to the colored band extending between the eyes. Other 

 stages, with a similar arrangement of elliptical spots of a bluish tint along 

 the dorsal and lateral lines, were of a reddish brown color, with pigment 

 patches of a darker greenish or of a brownish color, the abdominal region 

 heinor of a lio;hter color. 



" In the stage of Plate XIII. Figs. 1, 2, the anterior part of the body 

 already assumes somewhat the angular outline characteristic of the adult, 

 though these young stages are all more elongated than the adult, having 

 also the head comparatively well separated from the posterior part of the 

 body. The young in the stages of Plate XIII. Figs. 1, 2, do not as yet 

 show any traces of the prominent rows of spiny tubercles formed in the 

 adult. These were developed to a .slight extent in young Lumpus, measur- 

 ing 34 mm. in length (Plate XIII. Figs. 3, 4) : a line beginning to form 

 along the anterior slope of the anterior dorsal, a less prominent horizontal 

 row on a level with the line of the orbits close to the eyes, a third lateral 

 one along the body at the level of the upper extremity of the operculum. 

 This, the most prominent of the rows, consisted of large elliptical protu- 

 berances, through which spiny processes projected (Plate XIII. Figs. 3% 3^), 

 and a last row of somewhat smaller tubercles along the median line of 

 the abdomen behind the ventrals. The anterior dorsal fins of these young 

 stages (Plate XIII. Figs. 3, 4) resemble greatly such permanent anterior 

 dorsals as exist in Chironectes, for instance. 



"In the older stages (Plate XIII. Figs. 1-4) the anterior dorsal has 

 become well separated from the posterior, the median fins are entirely 

 isolated, with well developed fin rays, and the caudal has become sym- 

 metrical. The pectorals are somewhat larger, but otherwise they and 

 the ventral fin disks (Plate XIII. Fig. 3 c) do not differ much fi'om their 

 condition in younger stages. The early development of the pectorals 

 seems a marked characteristic of all embryos of osseous Fishes. 



" These young stages of Lumpus were all collected close to the shore ; 

 they were found living among the eel-grass at Nahant, near low-water 

 mark. Giinther has figured (An Introduction to the Study of Fishes, 



