Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 314 PLAXrnELMIJJTUJiS. Concoluta Ocrst. C. imracloxa Oerst., North yolk glands are not separate. Sea, Baltic. Schkojjrora O. S. Fam. Prostomidae. The mouth, which is situate on the ventral surface, leads into a muscular pharynx. At the anterior end there is a protrusible tactile proboscis furnished with , Prostomniii Oerst. (Gt/7-ator Ehrbg.), P. lineare Oerst. With pointed pcnial spine at the posterior end, imperfectly hermaphr
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 314 PLAXrnELMIJJTUJiS. Concoluta Ocrst. C. imracloxa Oerst., North yolk glands are not separate. Sea, Baltic. Schkojjrora O. S. Fam. Prostomidae. The mouth, which is situate on the ventral surface, leads into a muscular pharynx. At the anterior end there is a protrusible tactile proboscis furnished with , Prostomniii Oerst. (Gt/7-ator Ehrbg.), P. lineare Oerst. With pointed pcnial spine at the posterior end, imperfectly hermaphrodite, living principally in fresh water. Pr. helgolandicim, Kef., completely hermaphrodite. Fam. Microstomidae. llhahdncala with separate sexes. The small but very extensible mouth lies near the anterior cud of the body. There are laterally placed ciliated pits near the anterior end of the body. Formation of metamercs and transverse fission fre- quently occur. Microsto- IIIurn linearc Oerst. (fig. 248). (2) Sub-order: Den- drocoela. The body is broad and flat, and the lateral margins are often plicated. There are ten- tacle-like processes at the anterior end. There is a branched alimentai'y canal and a muscular pharynx Avhich is usu- ally They are, as a rule, herma- phrodite. The Dendroccela are mostly marine, but also live in fresh water and on land. In their ex- ternal appearance they resemble the Trema- todes, and the branching of their straight or forked intestine is a character common to the larger species of the latter. Compared with the Rhahdoccela, they are distinguished by the greater develop- ment of their bi-lobed cerebral ganglion, as well as by the greater number of their eyes (fig. 250). The rows of papillae, or the tentacle-like processes at the anteiior end of the body have Fig. 2oO.—Anatomy of FoJijcelis pallida (after Qnatre- fiiRes). G, Cerebral ganglion with the nerves given off from it; O, mouth ; D, branches of intestine ; Of> ova; O
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