The Morphology of Coeloplana. 45 
to trace the course of the gastric canals. As far as one can make 
out, the costae, as figured, seem to lie between large, lobed diverticula 
of the central gastric cavity, in contrast to the condition usual in 
Ctenophors, in which the rows of costae overlie the meridional canals. 
Wirvey’s discoveries led him to institute some interesting 
homologies and hypotheses which will be taken up further on. 
B. The Japanese Coeloplana. 
In the summer of 1901 it was the writer’s good fortune to 
discover, at Misaki, Japan, some specimens of what were very 
evidently Kowarevsky’s “Coeloplana”. Devoting himself the next 
summer to a renewed search he was further rewarded by finding 
several more, and altogether, that year and the next, some thirty 
or more specimens were obtained, some of which, however, were lost 
in aquaria and through poor fixing agents. The Coeloplanae were 
all obtained from two localities facing the open bay each a few 
square rods in area. One of these was the rocky beach immediately 
fronting the Marine Station and the other below the place known 
locally as “Dojin no Haka”. Both these areas are covered with 
broken rocks and boulders and are exposed to rather high surf in 
rough weather. At the times of lowest tides the Coeloplanae may 
be found at a depth of about two feet, clinging to the small coralline 
covered stones on the bottom, but they are very rare even in the 
most favorable localities, and the hunt for them is frequently 
discouraging. Apparently the animals are never to be found in a 
tidepool where the water might be left by the receding tide and 
grow stale or warm in the sun’s rays. Two species occured together, 
one a bright pink or red in color and the other smaller and 
chocolate brown. The two were found together in the same locality 
but always so situated as to make detection extremely difficult, 
owing to the resemblance between the animal and the stone or alga 
upon which it was fastened. I have never seen them floating or 
caught them in the tow-net but they have always been extended 
on the surface of the stone and fastened by slime so that they 
tenaciously resisted being taken off, and it was usually found more 
satisfactory to bring the stones into the laboratory when possible, 
and carefully force them off with a pipette. The Coeloplanae are 
found frequently on large rocks, stretched out into a thin shapeless 
film of slime hardly suggestive of anything animal. Such a specimen 
