BULLETIN OF THE 



as do all the rows, considerably farther back of the angle of the mouth 

 than it does in front of that point. The uppermost row of the four 

 runs upward to near the posterior and lower quadrant of the eye, where 



it takes a ti-end more directly 

 — backward, and extends for 

 a considerable distance back 

 along the dorsal limit of the 

 operculum. The other two 

 rows are situated considerably 

 nearer the lower than the up- 

 Head of Lepidogobius, showing the distribution of P^r ^ow, and are nearer each 

 the tactile Papilla;, x i|. other tlian either is to the 



uppermost or the lowermost row. They also run very nearly parallel 

 with each other. The lower one of these two middle rows contains the 

 fewest and largest papillae of the head, those of the inner mandibular 

 series excepted. There are about twenty-five papillae in the lower 

 row, nineteen in the next, thirty-five in the third, and fourteen in 

 the fourth. 



Many of the papillae of this species are distinctly excavated on their 

 summits, and in such a way as to show such an arrangement as is de- 

 scribed by Solger ('80, p. 375) to exist in the lower jaw of Gobius 

 minutus. The excavations are in the form of grooves, or creases, which 

 extend entirely across the summit of each papilla, each groove being 

 somewhat broader in its middle than at the ends. In some of the rows 

 these grooves are directed lengthwise of the row, while in others they 

 have a direction crosswise of it. There is some variation in the 

 direction of the grooves in the papillae of the same row, and consider- 

 ably more in some rows than in others ; but the constancy in some of 

 them is noticeable. In the larger papillae the grooves are much more 

 pronounced than in the smaller ones, in many of these latter the exca- 

 vation being a pit rather than a groove. In the lower-jaw series of this 

 species, the grooves of the inner rows extend crosswise to the axis of 

 the head, and those of the outer row lengthwise, thus corresponding to 

 the condition found by Solger in Gobius minutus. 



In addition to the four series thus described, there are numbers of 

 papillte scattered on other portions of the head, particularly about the 

 tip of the snout and on the opercular apparatus ; in these regions 

 they are particularh' numerous on the suboperculum. Also on each side 

 of the body, beginning immediatelj' behind the pectoral fins, there are 

 about thirteen transverse series, containing from five to ten papillae 



