By Helen Mellanby M.D., Ph.D. (auth.)
by Professor L. E. Eastham previously Professor of Zoology within the collage of Sheffield such a lot books are written with the purpose of delivering a few specific want, yet few finish with such unmarried objective. Mrs. Mellanby's isn't any exception, for whereas the writer deliberate this paintings to function a advisor to the college scholar, which functionality it fulfils in an admirable method, it is going to additionally turn out of worth to the trainer, the collage pupil and the beginner naturalist. whereas it can be argued that it's not the functionality of the Uni versities to educate traditional heritage within the quite often approved experience, it is going to consistently be the purpose of Zoologists to grasp extra approximately animals, what they're and do, the place they reside and why they reside particularly environments. it's unlucky, in view of the truth that nearly all of scholars of Zoology input the educating professional fession, that the expanding load of guide in morphology, body structure, cytology, genetics, evolution and so forth usually makes a private learn of animal existence relating to surroundings nearly very unlikely. The lucky ones stopover at the ocean for a fortress night's path in Marine Ecology; the others take posts in colleges with out even this respite and set approximately changing their educational studying to a college curriculum. the result's an bad and infrequently slavish imitation of collage procedure within the university type room.
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Additional resources for Animal Life in Fresh Water: A Guide to Fresh-Water Invertebrates
But it is seldom more. There are eleven genera with thirty species between them in this country. Genus Chaetogaster (Fig. 18A). Commonly found associated with tube-building insect larvae such as Chironomus (see p. 210) or inside the shells of the wandering snail. (Limnaea pereger). The worm is whitish except for the gut, and there are no bristles on segments 3, 4 and 5. The anterior part of the body is very broad. Five species. Genus Nais (Fig. 19B). A very common worm found amongst detritus at the bottom of ponds where it builds rather flimsy tubes.
It has been found to be quite common in the Thames tributaries and has also been reported from the Lake District. Family Aeolosomaddae Small transparent worms 1-2 mm. long with all the bristles hair-like. The skin contains conspicuous rounded bodies colouresi pink, yellow, or greerydepending on the species. The under-surface of the head is covered with cilia and the mouth is fringed with cilia which work like FIG. 17. A. Aeolosoma hemprichi, setae all hair-like. a vacuum cleaner. The septa are not properly deB.
EYES. There are a large ~umber of eye-spots as in P. nigra. SHAPE. Very well-marked tentacles at the sides of the head end. Body pointed behind. SIZE. Length nearly 2 cm. when animal is extended. BREEDING HABITS. Cocoons are not attached to solid objects. OCCURRENCE. Lives in small streams originating from clear springs, and is to be found under stones in fairly swift currents. Common in some places. COLOUR. Order Rhabdocoela The Rhabdocoele Turbellarians are more difficult to find on account of their smaller size.
Animal Life in Fresh Water: A Guide to Fresh-Water Invertebrates by Helen Mellanby M.D., Ph.D. (auth.)