528 
J. S. KINGSLEY. 
Figs. 16 and 17 correspond with Packard’s (’ 72 ) figs. 25 
and 25, a, reproduced here. They represent the young 
Limulus as it leaves the egg. It is 4 mm. long; the cephalo- 
thorax has a semicircular outline, and the abdomen, though 
smaller, has a similar shape. The dorsal surface of the cepha- 
lothorax is without traces of segmentation except in the lines 
bounding the cardiac region, where the depression marking the 
attachment of the muscles of the limbs are visible. These are 
not shown in the adjacent woodcut taken from Dr. Packard’s 
paper, which is otherwise good, except that the segmentation of 
the abdomen is much less distinct in nature. I may say here 
that the segmentation in Limulus nowhere affects the epiblast 
and its derivatives, and at no time in the development do we 
find the body divided into a series of somites moveable upon 
each other like those in the abdomen of a lobster ; the only 
joints are those between the cephalothorax and abdomen, and 
between the latter and the caudal spine. 
Dr. Packard’s figure of the ventral surface at this stage is 
very inaccurate. A better illustration will be seen in fig. 17, from 
which it will be seen that the appendages are closely similar 
to those of the adult female. 
A number of individuals which hatched on the same day were 
isolated and the first moult after hatching was watched for 
with considerable interest. Soon after hatching the young 
Limuli bury themselves in the sand as do the adults, and appa- 
