. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. IIYDEOZOA SirHO>'OPUOBA. 245 possess a circle of tentacles. They always, however, have a long tentacle arising from their base. This tentacle can be extended to a considerable length, and be retracted into a spiral coil. It rarely has a sinaple form, but, as a rule, it bears a number of unbranched lateral twigs, which are also very contrac- tile. These tentacles are invariably beset with a great number of nema- tocysts, which in many places are closely packed and have a regular arrangement. These
. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. IIYDEOZOA SirHO>'OPUOBA. 245 possess a circle of tentacles. They always, however, have a long tentacle arising from their base. This tentacle can be extended to a considerable length, and be retracted into a spiral coil. It rarely has a sinaple form, but, as a rule, it bears a number of unbranched lateral twigs, which are also very contrac- tile. These tentacles are invariably beset with a great number of nema- tocysts, which in many places are closely packed and have a regular arrangement. These aggregations of thread-cells are especially found on the lateral branches of the tentacles, and give ri-e to large, brightly-coloured swellings, the batteries of nematocysts. The batteries show consideraljle variations. Fig. 1 Group of buds of a Fhysophor at the bottom of the ]>neuma!ophore. C, Central cavity ; Sk, nectoealyx bud with the ectoJormal 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 Claus, Carl, 1835-1899; Metcalf Collection (North Carolina State University). NCRS. London, Swan Sonnenschein
Size: 1802px × 1387px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectanimals, bookyear1892
