Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . Development of Spider. resembling the figure 8 {fig- 175), the small and anterior division {a)being the base of the future head, the posterior and larger one (6),of the thorax. A fissure is next observed to divide the cephalic{fig. 176, a) from the thoracic portion {h\ the two parts beingdistinct at this period, and determining the essential nature of the * CCXLI. De generatione Aranearum in Ovo, H

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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1850