JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE XII, 
Illustrating Dr. Keferstein’s paper on the genus Lucernaria. 
Fig. 
1.—Lucernaria octoradiata, Liam. 
st. The stem. 
¢. Tentacles. 
p. Marginal papille. 
p’. Collection of thread-cells. 
n. Collections of thread-cells in natatory-sac. 
o. Oral tube. 
r. Four lines of connection between the outer and inner mem- 
branes of the disc. 
7’. The marginal space by which the different radial cavities com- 
municate. 
g. Reproductive organs. 
m. Longitudinal muscles in the stem. 
m’. Radial muscles in the natatory sac. 
m’’, Circular ditto. 
2.—Transverse section of the bell of Z. octoradiata, carried parallel to the 
border. 
c. Gelatinous disc: a, external, 2, internal, formative membranes ; 
z, intermediate substance, with numerous fine fibrille. 
s. Natatory sac: g, sexual organs; 7, lines of connection between 
the outer and inner membranes. 
R. Radial canals. 
3.—Radial section of the bell of ZL. octoradiata through the middle of a 
radial canal (rR). Letters as before. 
4.—L. campanulata, Lamx., divided by a radial section at about half the 
height of the bell. 
o. Oral tube. 
v. Stomach. 
s. Point of attachment of the angle or point of the natatory sac to 
the gelatinous disc. 
st. Stem not cut across. 
e. Orifices between the points, opening into the radial canals. 
f, Internal oral tentacles. 
Z. Tentacles. 
6. Tubercular swelling at the base of the fine tentacles placed 
nearest to the arm. 
Other letters as before. The reproductive organs on the right 
side have been removed, so as to bring the radial muscular bands 
clearly into view. 
5.—One of the tentacles with a swollen base, viewed laterally. 
6.—Tentacle of L. actoradiata. 
i os L. campanulata. 
8.—Thread-cells from the capitulum of the tentacles of L. cumpanulata. 
