. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. 380 CH^DTOPODA. its aperture arc two book-shaped papillae. The larvre are in part parasitic in the Cyd\ppUlrp. Alciopa Cantrainii Delle Ch., Naples. Fam. Tomopteridae (^GijmnocojM). Head well marked, two eyes, bifid praBstomium, aud four tentacles, of which two in many species are only present in the young. The mouth segment has two long tentacular cirri which are supported by a strong internal seta. The mouth is without proboscis and jaws. The segments are provided with large bi-lobed parapodia wit
. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. 380 CH^DTOPODA. its aperture arc two book-shaped papillae. The larvre are in part parasitic in the Cyd\ppUlrp. Alciopa Cantrainii Delle Ch., Naples. Fam. Tomopteridae (^GijmnocojM). Head well marked, two eyes, bifid praBstomium, aud four tentacles, of which two in many species are only present in the young. The mouth segment has two long tentacular cirri which are supported by a strong internal seta. The mouth is without proboscis and jaws. The segments are provided with large bi-lobed parapodia without setae. Toino2Jtcvls scolopendra Kef., Mediterranean. T. onisciformis Esch., northern seas, Heligoland. The genus BTyzostoma F. S. Lkt, a small group of hermaphrodite worms whose affinities are doubtful and disputed, may be placed here. They are small, disc-shaped animals, parasitic on Comatula. They possess a soft and ciliated skin, four pairs of laterally placed suckers on the ventral surface, and a protrusible proboscis fur- nished with papillfB at their anterior end, also a branched alimentary canal which opens at the posterior end of the body. On the sides of the body are five pairs of short parapodia, of which each one bears a hook (with one to three supple- mentary hooks) as well as CI /¥'/' \ \W^ ^^_ ^ supporting setre. As a rule, double as many cirri or short wart-like protube- rances are found on the margin of the body. M. gJahrum, cirriferum F. S. Lkt. Sub-order 2. Seden- taria = Tubicolae. * With indistinctly sepa- rated head and short, usually not protrusible proboscis, without jaws. The branchiae may be entirely absent and in many cases are confined to the two or three anterior segments following the head. In exceptional cases they are placed on the dorsal part of the middle of the body (Arenicolidcv). As a rule, however, they are represented by numerous filiform tentacles and ten- * E. Claparede, " Recherches sur la structure dcs Ann61ides sedentaircs).
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanimals, bookyear1892
