The embryology of Blatta germanica and Doryphora decemlineata
1889; Wiley; Volume: 3; Issue: 2 Linguagem: Inglês
10.1002/jmor.1050030203
ISSN1097-4687
Autores Tópico(s)Marine and coastal plant biology
ResumoTHE following study of the development of the cockroach and potato-beetle was taken up during the summer of 1887.On the suggestion of Dr. W. Patten, without whose stimulating friendship and assistance the work would not have been undertaken, I began with Bintta as a form calculated to help me to a knowledge of the fecundative changes in the Hexapod egg.Dr. Patten kindly placed at my disposal the results of his own work on Blatta, in the form of much carefully prepared material and some figures, which I have incorporated in Plate 111.(Figs. 43,Later I concentrated my attention on DoqyVzova, which I found to be a much more profitable object of study than Blatfa, especially as far as the more advanced stages were concerned.Thus it happens that my remarks on oogenesis and fecundation are more complete in Bknthz, while my account of the germ-layers and subsequent stages is carried into greater detail in Doryflkova.I have seen fit to treat of both insects as nearly as possible under single headings, instead of describing them independently in two chapters, because they differ strikingly in all the details of development, while their main ontogenetic features are as strikingly similar.By running both descriptions as nearly as possible in parallel lines, the contrasting details are made more salient, while the general remarks may be taken u p at intervals and not reserved 45 to 47, 5 2 ) .mzsse till the end of the paper. PREPARATION.There are three common species of Biattiak in Southeastern Wisconsin : Per@laneta orientnZi~-(Linn.),Platamodes micolor (Scud.), and Rlatta ge~~~znnica (Linn.).T h e first and the last occur, as is well known, about houses ; the second is abundant under the bark of decaying logs and stumps in open woods. No. 2.3BLi1 TTA AND DORYPHORA.Both methods gave equally good results.
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