370 
PROFESSOR E. RAY LANKESTER. 
eight tentacles, fig. 5, the praeumbral lid was still imper- 
forate.^ 
Tig. 4. — Enibrjo of Limnocodium Sowerbii, ^th of an inch in diameter. 
A. Surface view of oral pole. B. Optical section of same specimen 
in a plane at right angles to the oro-apical axis. Pt. Per-radial ten- 
tacle. L. Praeumbral lid. RC. Radial canal. St. Stomach. Ec. Ecto- 
derm. G. Jelly of the disc. 
Pig. 5. — Embryo of Limnocodium Sowerbii, a very little more advanced. 
A. Surface lateral view. B. Optical section of the same specimen in 
a plane including the oro-apical axis. Pt. Per-radial tentacles. L. 
Praeumbral lid. UC. Sub-umbrella cavity. Mn. Manubrium. RC 
Radial canal. Ec. Ectoderm. G. Jelly-like substance of the disc. 
* Whilst this is passing tl)rough the press I have ascertained that such 
is the development of the velum. 
