44 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
size of the lateral testis lobes which now no longer invade 
the dorsal part of the body; these figures (Pl. I. figs. 7, 9, 
10) also show the increase of the dorsal cap of large 
ectoderm cells and of test both in thickness and in super- 
ficial extent. About the 70th section (PI. I. fig. 10) it may 
be noticed that the test is becoming thinner in the medio- 
dorsal line and thicker in its lateral parts. The most 
posterior (curved) part of the nerve cord (myelon) is seen 
in figs. 9 and 10. Its two ends diverge, the one (1.s.) 
dorsally and to the right to become continuous anteriorly 
with the cerebral ganglion, and the other (7.) ventrally and 
to the left to join the caudal ganglion and nerve (compare 
JES JON sales, Size). 
Ten sections further forward (Pl. II, fig. 1) the cardiac 
and pyloric sacs are found to join at their dorsal ends, and 
from this point forward to its anterior extremity, in section 
163 or so, the stomach is seen as a single cavity which 
gradually diminishes in its vertical and increases in its 
horizontal (lateral) extent. The cesophagus is still seen 
running forwards over the stomach dorsally, and the cilia 
and gland cells are distributed as before. After another 
ten sections we find that the two lateral testis lobes 
become connected by a median band immediately above 
the much reduced ovary which now bifurcates (Pl. I. fig. 
2) and then dies away. ‘This last figure shows the con- 
striction marking the separation of the intestine (¢) off 
from the pyloric sac. 
We now come to the point where the cesophagus passes 
into the pharynx or branchial sac, and in section 103 (PI. 
II. fig 3, ph.) it 1s seen that the lumen of this dorsal cavity 
has become distinctly triangular with a medio-dorsal 
groove which is the posterior end of the well marked 
epipharyngeal groove corresponding to the dorsal lamina 
of Ascidians. ‘The stomach and testis are much as before, 
——E—eE a 
