. The Cambridge natural history. Zoology. 422 CTENOPHORA movements. Very little is known at present concerning many details of the internal anatomy, but there is one point of con- siderable theoretical interest—namely, the presence of definite male genital ducts. Three of Dr. Willey's specimens were mottled with a green pigment, whereas his fourth specimen and Korotneff's only speci- men were mottled with a red pigment. It has yet to be deter- mined whether the differences which have been observed in the individual specimens are of specific value. Fam. 2. Coeloplanidae.—C'oeloplana was origina
. The Cambridge natural history. Zoology. 422 CTENOPHORA movements. Very little is known at present concerning many details of the internal anatomy, but there is one point of con- siderable theoretical interest—namely, the presence of definite male genital ducts. Three of Dr. Willey's specimens were mottled with a green pigment, whereas his fourth specimen and Korotneff's only speci- men were mottled with a red pigment. It has yet to be deter- mined whether the differences which have been observed in the individual specimens are of specific value. Fam. 2. Coeloplanidae.—C'oeloplana was originally discovered by Kowalevsky in the Eed Sea, but has recently been found by Abbott ^ on the coast of Japan. The Japanese species are found principally on encrusting Algae, Zostera, Melobesia, etc., which they resemble very closely in colour. The Eed Sea species is, according to Kowalevsky, ciliated all over, but the Japanese species are ciliated only on the ventral surface. As in Ctenoplana, the body of Coeloplana is a flattened disc with a notch at each end of the tentacular axis, when creeping; but C'oeloplana does not swim, nor at any time does it assume a helmet - shape. The tentacles are very long and of a chalky-white colour. They can be retracted into tentacle-sheaths. When the animal is excited it throws out the whole tentacle in a cloud of white fila- (After nients, " and to watch it at such a time, shooting out and retracting the tentacles, moving along the side of the aquarium like a battleship in action is truly a remarkable ; ^ On the dorsal side of the body there is a series of processes which are called the dorsal tentacles. The statolith is very sroall, and is not surrounded by sensory processes as it is in Ctenoplana. There are no ctenophoral plates. The colours of the Japanese ^ Annot. Zoolog. Japan, iv. pt. iv. 1902, p. 103. 2 Abbott, p. Fig. 183.—Goeloplo,na mitsukurii, float- ing at the surface of the sea with the dorsal
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