46 The West American Scientist. 
animal pole of the ovum to the ovary. The eggs can be collected 
in great numbers in April and May, but we have not succeeded 
in finding more than two or three eggs in which the gastrula 
did not cover at least half of the yolk. The eggs are deposited 
in the evening, just where we have not been able to find. The 
later stages are abundant about the P. CS) (Sys@oseesmienn: 
The yolk is collected in large masses and is perfectly transparent. 
The embryos hatch in two days. We have succeeded in keeping 
the fishes two days after hatching. At this time the yolk is 
nearly absorbed. 
TYPHLOGOBINS CALIFORNIENSIS STEINDACHNER.—This is 
the most remarkable of the fishes found at San Diego. It is very 
abundant under large rocks, on the southern shore of Point 
Loma. It lives in the holes made by a Carideoid crustacean, 
with which it is usually found associated. It is very tenacious of 
lifeand many individuals were kept in confinement several months. 
Some which were gradually placed in fresh water, remained 
active for a week, when they began to swell. On being again 
transferred into salt water all but one survived. They frequently 
swim (in confinement) at the surface of the water, back down, 
their ventrals using the surface of the water as a plane for attach- 
ment. The fully grown individuals are entirely destitute of vision 
and seem merely to have an uncomfortable feeling in direct sun- 
light. Ordinarily they will hide under transparent objects as 
readily as under a dark one. A test tube which was accidentally 
placed ina vessel containing them was completely filled with 
them. In individuals four centimeters long, the eyes are not 
covered by so thick a layer of epide-mis and they can see some 
distance in front of them. Any object thrust in front of smaller 
ones usually causes them to turn when the object is about three 
centimeters from their eyes, while it does not disturb the larger 
ones. The eye is very small, the crystaline lense comparatively 
large. The optic nerve is extremely thin, but has been traced to 
the brain, both by maceration and by dissection. There seems 
to be no difference in the structure of the visual organs between 
the smallest and largest individuals. The early stages have not 
been observed, but we doubtless are here dealing with a case of 
retardation rather than of degeneration. 
The eggs of this species present some thoroughly new features. 
Several females spawned while in confinement, but did not de- 
velop. The eggs are oval. They are surrounded by the usual 
zona radiata and a network of threads. The meshes of this net 
are coarsest near the vegetable pole of the egg and finer toward 
the animal pole, near which they form a second membrane, per- 
forated by a few holes only. This xetwork of threads ts attached 
to the zona radiata around the micropylar region. This condition 
is approached most nearly in osmeus eperlanus, where a second 
