. Annotationes zoologicae japonenses / Nihon do ?butsugaku ?'ohi. Un nouveau AstomatOUS Metaphrya ciliés, sagittae, gen. et sp. nov., trouvés dans le Cœlome de Sagitta. Par Iwaji Rigakuhakushi, Ikeda. Pendant un court séjour, en décembre 1913, à la Station de biologie marine de Misaki, le Dr Yatsu gentiment appelé mon attention sur un spécimen vivant de Sagitta, qui contenait quelques grands ciliés dans le corps-cavités. Après examen au microscope, ces ont été ascer maintenu à l'égard d'une mouthless holotrichous sous forme d'un remarquable caractérisation. Je propose d'appeler cela Metaphrya sagittac, gen. &A

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. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. A New AstomatOUS Ciliate, Metaphrya sagittae, gen. et sp. nov., found in the Coelom of Sagitta. By Iwaji Ikeda, Rigakuhakushi. During a short stay, in December of 1913, at the Misaki Marine Biological Station, Dr. Yatsu kindly called my attention to a living specimen of Sagitta, which contained some large ciliates in the body- cavity. Upon close examination under the microscope, these were ascer- tained to represent a new mouthless holotrichous form of a remarkable characterization. I propose to call it Metaphrya sagittac, gen. & sp. nov. Owing to the transparency of the host, much of the external characters of the parasites could be observed in their natural habitat. Fig. 1 re- presents the surface view of one of the four largest specimens in life. The body is pear-shaped, mea- suring about 0.25 mm by 0.13 mm. It is nearly transparent and quite colourless. The anterior end is distinctly narrower than the posterior, which is rather rounded. The body appears to be radially symmetrical in its structural plan excepting the fact that the anterior end is somewhat deflected towards one side. Fine but long cilia are present, not uniformly all over the body, but growing in 12 longitudinal shallow grooves of the body, so as to form as many equidistant ciliary bands. The organism is devoid of a mouth or any other external aperture ; therefore, it should belong to the suborder Astomata of the order Holotricha. The cytoplasm investing the body is finely granular ; its differentiation into the ectoplasm and the entoplasm is in the fresh state indistinct. Beneath this cytoplasmic layer there can be recog-. Fig. I. Fully grown Metaphrya sagititu in the living state. Xi8j.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Nihon Do?butsu Gakkai; T