1889.] Nofcs on the Habits of Some Ambly stomas. 603 
and in bunches of various sizes to blades of dead grass and to 
sticks under water. I have also seen them strung along on the 
bottoms of shallow ditches, as if they had been deposited by the 
female while crawHn- about. I have reason to suspect that eggs 
had been hiid in ihc same ponds at an earlier date. It is also 
certain that ()\ iposiii^n continued at least as late as March 22. 
Each egg is surr.nindcd with a capsule of a clear gelatinous 
substance, by wliich it adlicrcs to other eggs and to objects in 
the water. This mass oi gelatinous matter has a diameter of 
from 6 to 9 mm. It is made up of two principal layers separated 
from each other by a very thin layer, and from the yolk by ap- 
parently two other very thin layers. 
How the eggs are fertilized by the male I have not observed ; 
but it is probably much as in the case of A. punctatum. Some 
eggs strewed by a female over a brick in an aquarium failed to 
develop, doubtless because they were not fertilized. All the eggs 
found on the third of March had begun segmentation, and it was 
not long l)cr()rc tlic outlines of tlic embryo became visible. The 
changes passed thiougli b\- the embryo cannot be here detailed. 
Very earl)- eiha are (le\(lnpe(I o\\ the outer surface, and the 
embr\-(^ l^e-ins slnulv to revoKe within tiie gelatinous envelope. 
When it is S nnn. long it lies coiled within the envelope, and may 
be seen to possess short buds to represent the gills and the 
"balancers." About the 28th of March, some of the eggs were 
so far ad\ aneet! that on being handietl tlie tadpoles slipped out 
of the gelatine, and sw<im about in the water. Already, how- 
ever, there were more advanced \■^\■\■^ swimming about in the 
pond, which I could not distinguish as different. The eggs from 
which the latter originated may have been laid earlier; but it 
seems quite certain that some eggs develop more rapidly than 
others. Many of the eggs which I had more particularly under 
observation did not hatch until April loth. At the time of 
escape from the &g^ the young are about 10 mm. in length. 
They are of a bright olive-green color, with indications of 
squarish blotches along the back. There is a broad fin running 
along the back and around the end of the tail to the vent. Three 
