The Apodida; A Morphological Study
by Henry Meyners Bernard (9781150325489)

General Books publication date: 2009 Original publication date: 1892 Original Publisher: Macmillan and co. Subjects: Zapodidae Triopsidae Limacodidae Jumping mice Apodidae Slug caterpillar moths Juvenile Nonfiction / Animals / Marine Life Nature / Marine Life Nature / Seashells Science / Life Sciences / Zoology / General Science / Life Sciences / Zoology / Invertebrates Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: SECTION II The Outer Body Form THE HEAD THE comparative anatomy of the Crustacea has long ago established the fact that the Crustacean head must originally have been composed of five fused segments of an annulate body. Our derivation of Apus from a browsing Annelid explains the method of this fusion, that it did not take place along the longitudinal axis of the body, but by a doubling of this number of segments upon themselves. This term " doubling " or " doublature " has already been applied to the under sides of the forehead of such animals as Apus, Limulus, and the Trilobites, but apparently meaning nothing more than the doubling of the forehead, which has both a dorsal and a ventral surface. In reality, however, this "doubling" is the true description of the Crustacean head as shown in Figs. I and 2; these should be further compared with Fig. 46, p. 212, which represents a longitudinal section of a Trilobite, where the doubling is very clear. Owing to the bending on itself of the cylindrical Annelidan body, the original head must have been anteriorly almost completely hemispherical (Figs. I and 46). This form of the original Crustacean-Annelid head 6 3 -- Fig. i. -- Diagram showing the first six segments of a carnivorous Annelid; the first five being bent round; /, the prostomi...

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