ELISHA MITCHELL SCIENTIFIC-SOCIETY 88 
sense-organs and on the embryology. His notesand ma- 
terial, we are told, are in such shape that they can be 
handed over to some else, and it may be safely predicted 
that a valuabie contribution to science will be the out- 
come of the last summer’s work of this talented young 
naturalist. 
The account of the cubomedusan structure given by 
Dr. Conant is succinct, but comprehensive. ‘The deep, 
four-sided bell bears a tentacle (or in some species a bunch 
of tentacles) at each angle. On each lateral surface, at 
a higher level than the tentacles, is situated a niche into 
which projects asense-organ. The primitively undivided 
_ (Scyphistoma condition) gastrovascular space is here dif- 
ferentiated into a central stomach and a peripheral por- 
tion lying in the lateral wall of the bell. ‘The peripheral 
portion is subdivided into four stomach pockets by linear 
partitions, lying in the plane of the tentacles and there- 
fore interradial. These partitions (cathamme) are mere 
strips of entodermal lamella, produced by the fusion be- 
tween the entodermal lining of ex- and sub-umbrella. 
The cathammal lines stop short of the tentacles, leaving 
an undivided peripheral portion of the primitive space, 
by means of which the four stomach pockets communicate 
with one another. As Conant points out, the arrange- 
-ment recalls the gastrovascular system of many Hydro- 
medusz, with the difference that in the Cubomedusz the 
radial canals are wide ‘stomach pockets’ and the catham- 
mal plates are narrow lines. When we come, however, 
to the extreme peripheral portion ol the gastrovascular 
system, we find that the likeness is not with the Hydro- 
medusez, but with the lobed Scyphomeduse. The gas- 
trovascular space, to be brief, does not end with an even 
circular edge at the bell margin, asis the rule in the for- 
mer group, but is divided into separate lobes (marginal 
