90 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



end of the dorsal fin, and the other is below the anterior end of the 

 soft dorsal. Each group has a few smaller chromatophores above 

 and below it. The group under the posterior end of the dorsal fin 

 was probably the first to appear. In this specimen, as shown in the 

 plate, there was an enormous chromatophore in the skin just above 

 the anal fin; this was apparently connected by processes with the 

 color cells of the lateral line group just above it, and is probably the 

 origin of the network of chromatophores which are found in a 

 similar position in the later stages. These groups of pigment cells, 

 when the young fish is looked at with the naked eye, have the effect of 

 producing the appearance of two grayish or dusky bands on the sides, 

 the anterior one of which is just beginning to appear and is much less 

 pronounced than the posterior one. Other large expanded pigment 

 spots are found in other places. The most conspicuous of these are 

 scattered around the head region, particularly on the under side; a 

 small clump is also found on the back near the beginning of the 

 dorsal fin; two or three chromatophores are found along near the 

 ventral edge of the caudal peduncle, while only one or two have yet 

 appeared at the base of the caudal fin. The tissues of the fish are so 

 transparent that the dense pigmentation of the posterior part of the 

 body cavity is visible from the outside. 



Plate XI shows the drawing of the specimen 12.5 mm. in length. 

 It is here enlarged to ten times the natural size. The greatest body 

 depth lies along a line drawn not far forward of the posterior margin 

 of the gill-cover. Thus it is evident that the line of greatest body 

 depth has shifted backward appreciably from the position which it 

 occupied in the previous stage. The fins are fully differentiated and 

 the embryonic fin-fold has completely disappeared. The snout has 

 become somewhat pointed, though not so much so as in the later 

 stages. The mouth has become more oblique; the maxillary and 

 premaxillary have grown broader; the teeth of the lower jaw are 

 large, strong, incurved, particularly along the sides; the teeth of the 

 ui:)per jaw are numerous but very minute; the opercular bones have 

 grown downward and backward so that the branchiostegals are 



