The American journal of science (1903) (17531345253)

Title: The American journal of science

Identifier: americanjourna4151903newh (find matches)

Year: 1880 (1880s)

Authors:

Subjects: Science

Publisher: New Haven : J. D. & E. S. Dana

Contributing Library: Smithsonian Libraries

Digitizing Sponsor: Biodiversity Heritage Library

Text Appearing Before Image:

Cumings—Morphogenesis of Platystrophia. 35

Text Appearing After Image:

Fig. 18. Platystrophia acutilirata from Richmond, Indiana, a-a', anterior and ventral views of a very mucronate individual; b b', an intermediate form ; c-c', narrower, very gibbous form ; d-d", retrogressive type with stages /and II drawn sepai'ately to the left; e-e", a similar individual showing asymmetrical growth and great increase of the cardinal angle in late growth stages ; /, g, h, i, outlines of other retrogressive individuals showing increase of the cardinal angle in late growth stages ; k-k'" an individual from the base of the acutilirata zone snowing progressive decrease in the cardinal angle. Specimens a-i are from the upper part of the acutilirata zone. Author's collection.

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1903

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