. Elements of comparative anatomy. Anatomy, Comparative. 504 COMPARATIVE ANATOMY. § 236. The male generative organs of Insects very often repeat in their development the forms of the female organs, so that even the separate divisions of both sets of glands not unfrequently correspond. The testes, which are always paired, and seldom fused into one organ, are composed of cajcal tubes, just like the ovaries; they also vary in number and size, and are connected with one another in all kinds of ways (Figs. 161, 162, /). The testes of either side are often united in the Lepidoptcra. The Diptera and
. Elements of comparative anatomy. Anatomy, Comparative. 504 COMPARATIVE ANATOMY. § 236. The male generative organs of Insects very often repeat in their development the forms of the female organs, so that even the separate divisions of both sets of glands not unfrequently correspond. The testes, which are always paired, and seldom fused into one organ, are composed of cajcal tubes, just like the ovaries; they also vary in number and size, and are connected with one another in all kinds of ways (Figs. 161, 162, /). The testes of either side are often united in the Lepidoptcra. The Diptera and Strep- siptera, as well as many Neuroptera, have two simple, long-, and always separate testicular tubes. In many Coleoptera, also, each testis is a long, closely-coiled ca3cal tube, surrounded by a special membrane. The testes of most insects are made up of a number of tubes. Thus each testis, in most of the Hemiptera, consists. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gegenbaur, C. (Carl), 1826-1903; Bell, F. J. (Francis Jeffrey), 1855-1924; Lankester, E. Ray (Edwin Ray), Sir, 1847-1929. London, Macmillan and Co.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectanatomycomparative
