84 BULLETIN OF THE 
each of the two individuals 19 mm. long, papillae were found on the 
sides of the body, and on one of them a few on the head, besides in the 
regions where they occur regularly In one of these the papille on 
the right side of the body were distributed in what I regard as repre- 
sentatives of nine of the transverse series described in Clevelandia. 
The first and second series behind the pectorals were represented by one 
papilla each; the third and fourth, by three papille each ; the fifth, 
sixth, and seventh, by two each ; and the eighth and ninth, by one each. 
The series were evidently segmentally arranged, though not all were 
on consecutive segments ; thus between the third and fourth series were 
two myotomic plates ; between the fourth and fifth, four plates ; between 
the fifth and sixth, two plates; between the sixth and seventh, one 
plate ; and between the eighth and ninth, two plates, 
Figure 25, Plate IV., shows the arrangement of a group of papille 
on the right side of the head of this same individual... As seen by the 
figure, seven of these papilla were much larger than the remaining 
ones, and were situated on quite prominent ridges of the skin. 
Although the papille have been diligently searched for on the sides 
of the body of other specimens, they have been found on the two 
smal] ones only. The question at once arises, Are the papille absent 
from the larger ones because they have degenerated and completely 
disappeared during the life of the individual? All the evidence I 
have on this point is contained in the facts presented. That the 
papille have been found only on the two small specimens examined, 
and that they have not been found on any of the numerous large ones, 
certainly suggests very strongly an affirmative answer to the question. 
It must be said, however, that a considerable percentage of my larger 
specimens are not so well preserved but that the papille may possibly 
have been present in them and escaped detection. But some of them 
are well preserved, and were the papillze present they would, I am sure, 
have been found. 
That the sense papillae are less numerous on Typhlogobius than on 
several, at least, of its near allies, is evident. The question may now 
be asked, Is it not possible that, although there has been no compensa- 
tion for the loss of sight by an increase in number of the tactile papilla, 
such a compensation has been brought about by a higher development 
of the individual papille themselves? So far as structural evidence 
is concerned, this is certainly far from probable. Figures 23 and 24 
(Plate IV.) show sections of two papilla of the inner mandibular series 
of Typhlogobius; and for the purpose of comparison a section of a 
