Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 314 PLATYHELMINTHES. yolk glands are not separate. Con/valuta Oerst. C. paradoxa Oerst., North Sea, Baltic, tfchizoprora 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 papilla?. Prustomt/ni- Oerst. (Gyrator Ehrbg.). P. lineare Oerst. With pointed penial spine at the posterior end. imperfectly hermaphrodite, living principally in fresh water. Pr. lielgola
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 314 PLATYHELMINTHES. yolk glands are not separate. Con/valuta Oerst. C. paradoxa Oerst., North Sea, Baltic, tfchizoprora 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 papilla?. Prustomt/ni- Oerst. (Gyrator Ehrbg.). P. lineare Oerst. With pointed penial spine at the posterior end. imperfectly hermaphrodite, living principally in fresh water. Pr. lielgolandieum, Kef., completely hermaphn ulite. Fam. Microstomidae. separate sexes. The small but very extensible mouth lies near the anterior end of the body. There are laterally placed ciliated pits near the anterior end of the body. Formation of metarneres and transverse fission fre- quently occur. Mio-osto- ni ii in I i//care 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 alirnentary canal and a muscular pharynx which is usu- ally protrusible. They are, as a rule, herma- phrodite. The Dendroccela are mostly marine, but also live in fresh water and 011 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 Bhabdocffiln, they are distinguished by the greater develop- ment of their bi-lobed cerebral ganglion, as well as by the greater number of their eyes (tig. 250). The rows of papilla, or the tentacle-like processes at the anterior end of the body have FIG. 250.—Anatomy of Pulyceli* pi/UiJ/i (nfter Quatre- fages). G, Cerebral ganglion with the nerves given off from it; O, mouth ; D, branches of intestine ; Ov, ova; Od, oviduct; V, vagina; , female gene- rative
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