136 
University of California Publications in Zoology 
[Vol. 27 
The chronology of development in the material secured by Dr. 
Emmel in 1920 was as follows: 
July 14, eggs found; anterior limb buds well developed, but posterior ones 
not clearly defined; no gills. 
July 20, gills developing. 
July 23, gills expanding posteriorly, rather thick, sacdike vessels with 
main loop developing a capillary network. 
July 26-31, gills all expanded. 
August 29, one larva began to hatch but died in the attempt. 
The material found in 1898 hatched on September 13, about 50 
days after being found, and, as the eggs had already commenced to 
develop when discovered, an incubation period of approximately two 
months is indicated. One individual at hatching' was 32 millimeters 
in total length. The first young in the 1903 material hatched out on 
September 11 ; it was then 26.5 millimeters long. Several young 
which hatched from a cluster on September 15 showed great activity 
in climbing as soon as they came into contact with wood ; individuals 
. would cling to a stick by coiling the tail about it with the aid of one 
hind foot. Ritter (1903) suggests that the young born in the oak tree 
cavities at Berkeley may have remained aboveground for the first 
year of life. Young, in cavities of any sort, tend to group together, 
presumably to avoid desiccation. A few individuals of small size are 
to be found on the ground, but a majority of those discovered in 
terrestrial retreats are of larger size. Dispersal of the young probably 
occurs after the autumn rains. 
Several specimens in the collection of the Museum of Vertebrate 
Zoology contain well developed ovarian eggs. No. 8252, collected in 
North Berkeley, February 10, 1904, and kept alive until February 23, 
contains 27 ova, the largest 4 millimeters in diameter ; nos. 8253-55, 
taken in Sutro Forest, San Francisco, February 15, 1912, contain eggs 
up to 4 millimeters in diameter; and no. 5679, found 3 miles east of 
Coulterville, Mariposa County, on June 3, 1915, contains eggs up to 
4.3 millimeters in diameter. The latter would probably have soon 
been laid. 
On one occasion a recently hatched specimen of Aneides lugubris 
was found in the water coming from a drinking fountain on the Uni- 
versity of California campus. This specimen, 28 millimeters in length, 
was obtained in October, 1913. 
A series of 36 well preserved specimens of Aneides collected 2 miles 
southwest of Napa, Napa. County, on December 13 and 16, 1912, 
affords an opportunity to study the growth of this species subsequent 
