Download Animal Life in Fresh Water: A Guide to Fresh-Water by Helen Mellanby M.D., Ph.D. (auth.) PDF

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 offering a few specific desire, yet few finish with such unmarried function. Mrs. Mellanby's isn't any exception, for whereas the writer deliberate this paintings to function a advisor to the varsity scholar, which functionality it fulfils in an admirable approach, it's going to additionally turn out of price to the trainer, the collage pupil and the novice naturalist. whereas it can be argued that it isn't the functionality of the Uni­ versities to coach traditional background within the usually accredited feel, it's going to constantly be the purpose of Zoologists to grasp extra approximately animals, what they're and do, the place they dwell and why they reside specifically environments. it truly is unlucky, in view of the truth that nearly all of scholars of Zoology input the instructing seasoned­ fession, that the expanding load of guide in morphology, body structure, cytology, genetics, evolution etc usually makes a private research of animal existence when it comes to surroundings virtually most unlikely. The lucky ones stopover at the ocean for a fortress­ night's path in Marine Ecology; the others take posts in colleges with no even this respite and set approximately changing their educational studying to a faculty curriculum. the result's an bad and infrequently slavish imitation of college technique within the college category­ room.

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Additional info for Animal Life in Fresh Water: A Guide to Fresh-Water Invertebrates

Sample text

Rhabdites are easy to see in many species. Rhabdocoeles are generally carnivorous, feeding on small crustaceans such as water-fleas, but plants such as algae and diatoms are also eaten; one genus, MicrO$tomum, is parasitic on Hydra. The sting cells of the Hydra become functional as defence organs in the body of the Microstomum. Rhabdocoeles lay yolky eggs which presumably contain several developing young. These may pass out of the adult's body, or they may be liberated only after the death of the parent.

Larger than the dorsal; the latter may be absent from several of the anterior segments. The worms are sometimes subterranean in habit, but they are also found in marshes, ditches, and in the mud near the banks of rivers. Family Enchytraeidae The Pot Worms This is a large family with 10 genera and a total of 130 species found in Britain. Most of them are not more than 2! cm. long, whitish in colour, but a few have red blood. There are a number of simple-pointed bristles in each of four bundles which are either straight or slightly S-shaped (Fig.

Mag. Nat. , 9, 612. 5. The Quantitative Ecology of Lake-dwelling Triclads, T. B. Reynoldson (1958). , 9, 94. (b) Class Trematoda. The Flukes (parasitic for the greater part of their lives). Most adult forms of Trematode flatworms are similar in shape to the free-living Triclads, being flattened and leaf-like. Because they are parasites and have to cling to their host they have suckers on the underside of their bodies; some have two suckers, others have more. The mouth is always near the anterior end, and is in the middle of the depression of the front sucker.

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