VOL. I. | The Point Loma Blind Fish. 71 
crustacean with which this fish is associated, and which spawns at the 
same time, that the idea of a highly specialized mimicry at once sug- 
gests itself. The similarity between the eggs is heightened by the 
fact that they are both bright yellow. In females with ripe eggs 
they can frequently be seen forming a yellow band along the flanks. 
The yellow of the blind-fish egg is entirely confined to the yolk 
which contains many oil globules. The granular potoplasm is 
opaque. 
In the eggs deposited naturally the water space remained quite 
small, while in those forced from the ovary it soon became enor- 
mous, being many times the size of the egg proper; the egg shell 
assumes an ovate shape at the same time. Which of these two forms 
is the natural one I am not able to say. Hoffman * gives the figure 
of the egg of Gobdius minutus, which resembles fig. 3, pl. and 
may be the normal condition. 
PLATE II. 
1. Young Clevelandia or Lepidogobius taken with the surface dredge. 
2. Tail of a young Clevelandia. 
3. Tail of a more advanced individual. 
4, 4a. Clevelandia longipinnis, adult X22. 
5, 5a. Gillichthys y-cauda, adult X 3. 
PLATE III. 
1. Egg of 7yphlogobius californiensis undergoing the first cleavage. 
2. Micropylar region of an egg of the same species under pressure, showing the 
margin of the attachment of the outer membrane. 
3. An egg forced from the ovary. A very large breathing chamber has been 
formed. Abnormal (?). 
4. A portion of the network of the outer membrane remote from the micropyle 
of the egg represented in fig. 3. 
5. Micropylar region of the egg represented in fig. 3. 
6. Adult 7phlogobius, natural size, in the position usually assumed in the aqua- 
rium, 
7. Young 7yphlogobius % 43, showing color markings and the eye. 
8. Dorsal view of skull of 7yphlogobius x 24. 
9. Lateral view of same x 24. 
10. Ventral view of same X14. 
11. Eye, optic nerves and portion of brain of same, showing the very much elon- 
gate slender optic nerves and the comparatively large lens as compared with the 
cup of the eye X 24, from nitric acid maceration of a specimen % inch long, Jan- 
—uary 29, 1888. ee) 
12. An isolated eye after treating with nitric acid showing the film of translu- 
cent substance surrounding it. 
*Zer Ontogonie der Knochenfische, pl. iii, fig. 9, 1881. 
