MUSEUM OF COMPARATIVE ZOOLOGY. 53 



It was still quite active five hours after it was removed from among the 

 dead fishes. How much longer it may have been able to survive I do 

 not know, as T then killed it with alcohol." 



In a paper on the " Point Loma Blind Fish and its Relatives," Prof. 

 C. H. Eigenmann ('90, pp. 65-71) has given some very interesting facts 

 on the habits of the species, and also the only account, so far as I am 

 aware, of some of the profound structural changes that have been 

 induced in it by its peculiar way of living. 



The fact that the fishes pass their lives under stones in ci-ab holes, or 

 bui-ied in the sand, must of course have been known by every one who 

 had collected them ; but as Prof. Eigenmann has had much better op- 

 portunity to study their habits than has any one else who has written 

 on the subject, his account is quite full, and so interesting that I repro- 

 duce a considerable portion of it. 



About San Diego the fish has been found at Point Loma only ; it 

 has been taken, however, at Encenada. Its habitat is consequently, so 

 far as known, quite limited. The crustacean in the holes of which and 

 with which it lives is a burrowing carideoid, which has the same pink 

 color as the fish ; but while the crustacean is found throughout the en- 

 tire bay region, the fish is its companion only at Point Loma. Another 

 species of the Gobiida?, belonging to the genus Clevelandia, also fre- 

 quents the holes of the same crustacean along with Typhlogobius. ^ 



"Sometimes the'fishes [other than the blind fishes'?] live quite out of 

 water on the damp gravel and sand under rocks. ... In the bay the 

 gobies habitually live out of the holes, into which they descend only 

 when they ai-e frightened, while at Point Loma they never leave their 

 subterranean abode, and to this fact we must attribute their present 

 condition." 



It is not the eyes alone that have undergone modification. The 

 whole frontal region of the skull has been profoundly changed ; the 

 scales have entirely disappeared, the color has been reduced, and the 

 spinous dorsal has been greatly diminished in size. " The skin, and 

 especially that of the head, has become highly sensitized." 



^ I find Clevelandia in San Francisco Bay at West Berkeley ; and here it often 

 enters holes in the mud with a species of Crangon. In this case tlie linles are not, 

 I tliink, dug by the crustacean. The general appearance and actions of tlie two 

 animals are so similar that at a little distance it is very easy to mistake tlie one for 

 the otlier. The color of the two is absolutely indistinguishable as they rest at the 

 bottom of the shallow tide-pools ; and it is so like the dark brown mud of the bot- 

 tom on which the animals are found that it is with great difficulty that they are 

 seen when not in motion. 



