By Helen Mellanby M.D., Ph.D. (auth.)
by Professor L. E. Eastham previously Professor of Zoology within the college of Sheffield so much books are written with the purpose of providing a few specific want, 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 method, it's going to additionally end up of worth to the trainer, the college scholar and the beginner naturalist. whereas it can be argued that it isn't the functionality of the Uni versities to educate traditional heritage within the regularly accredited experience, it's going to consistently be the purpose of Zoologists to understand extra approximately animals, what they're and do, the place they dwell and why they stay particularly environments. it's unlucky, in view of the truth that nearly all of scholars of Zoology input the instructing professional fession, that the expanding load of guideline in morphology, body structure, cytology, genetics, evolution etc often makes a private examine of animal lifestyles relating 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 faculties 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 college approach within the institution type room.
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Additional resources for Animal Life in Fresh Water: A Guide to Fresh-Water Invertebrates
THE TRUE WORMS (ANNELIDA) 57 Family Lumbriculidae Long, thin worms measuring up to 8 cm. in length appearing dark red owing to the colour of the blood. The dorsal bloodvessel gives off a number of blind branches in the mid-body region (Fig. 2IB). Only two setae in each bundle (making eight setae in all) which may be cleft or simple pointed. There are four genera of which Lumbriculus, containing one British species L. variegatus, is a very common example (see Fig. 2IA). ' " ' : • I : i . , C " 'ovtII FIG.
Long (see Fig. 8B). The body is much flattened and resembles that of a Triclad; it is usually pale brownish. Two small eyes are present, situated above avtll the nervous mass or brain. The mouth is at the anterior end and it leads into a very muscular pharynx. 12 Genus Macrostomum. Probably two species in Britain. Individuals are rather small, less than 2 mm. long. The anterior end has long sensory hairs projecting from it (see Fig. 9A), while the posterior end has large papillae for fixing the animal to surfaces.
21. A. B. C. D. Lumbriculus variegatus, whole worm. Lumbriculus variegatus, two segments enlarged. Head end of Rhynchelmis. Egg capsule of Rhynchelmis. After Wesenberg-Lund. ditches, streams, rivers, lakes, etc. The body is greenish at the anterior end, with the deep red colour of the blood showing through wherever it is not obscured by green pigment. Apparently it never reproduces by laying eggs in this country; multiplication takes place by the worm fragmenting and each piece growing a head and tail.