MUSEUM OF COMPARATIVE ZOOLOGY. 85 
directly from the inner wall of the bell cavity, as the larva grows older a rounded 
protuberance forms in the upper walls of the bell cavity from which th2 pro- 
boscis hangs. This protuberance, when seen from the side, is hemispherical in 
shape. It forms, however, by means of mesenteries which join the inner wall 
of the bell in the four meridians passing through the sense-bodies, four pockets, 
or blind cavities, enclosed by it and the inner bell walls. These pockets are 
extensions of the bell cavity into the apical walls of the bell, and are separated 
from each other on the sides by the mesenteries which join the sides of the 
proboscis and the inner bell walls. In these recesses transparent globules were 
observed in several specimens. Two of these are represented in Fig. 5. 
Figs. 2, 3. 
Two small jelly-fishes which are closely related to the above, or are the larvee 
of a Medusa like Tamoya, were found on several excursions in Castle Harbor. 
They are slightly smaller than the youngest larve of the above-mentioned 
Acaleph, and for lack of better knowledge have been provisionally referred to 
S. punctata, 
The bell walls are thin, rigid, and without chymiferous radial tubes, while 
the outer surface is destitute of the characteristic cells which have suggested 
the name punctata. The proboscis is very slightly developed, resembling a 
simple muscular layer split off from the inner walls of the bell below the 
apex. 
The bell margin bears four tentacles alternating with as many sense-bodies, 
all of which are situated in one and the same plane. The four tentacles are 
rigid, and crossed by annulations of cells arranged in bands, as in. 7’. punctata. 
Each otocyst is a simple spherical sac, in which is found an otolith. The 
style which bears the otolith has well-defined pigment spots in its walls; 
these are probably ocelli. No well-marked “ hood,” such as exists in Tamoya, 
is yet developed. Near the point of attachment of the otocyst, which has no 
peduncle, to the bell margin, there is a thickening of the bell margin, forming a 
protuberance on either side of which are small clusters of nematocysts. 
Ectopleura sp. 
Fig. 11. 
A small Medusa, evidently larval, is referred to the genus Ectopleura. Un- 
like the young* of E. ochracea A. Ag., it has only two well-developed tentacles, 
* Bull. Mus. Comp. Zodl., IX. 8. An unknown Tubularian (Fig. 14), probably 
larval, which was unlike any of the species of American genera, was taken at New- 
port during my work there last summer. Description of a single specimen : — 
Bell colorless, high, with thin walls and well-marked apex, crossed by four broad 
radial tubes; outer surface irregularly covered with lasso-cells. The tentacles are 
two in number, and are placed opposite each other on the bell margin. Proboscis 
mounted on a hemispherical projection of the apex of the bell into the bell cavity. 
Stomach diminutive, lips small, smooth, slightly colored. 
