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I.—On some Fossil Entomostraca from South America

Published online by Cambridge University Press:  01 May 2009

T. Rupert Jones
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Extract

Valves subcircular, approaching subquadrate, like some small Lamellibranchs. Umbo at the antero-dorsal corner, and at aa angle of 40° to the extreme curvature of the concentric ridgelets. Hinge-line straight, behind the umbo, about half the length of the longest diameter of the valve. The other edges rounded; the anterior nearly semicircular; the ventral obliquely curving up to meet the steeper and narrower posterior curve.

Type
Original Articles
Information
Geological Magazine , Volume 4 , Issue 7 , July 1897 , pp. 289 - 293
Copyright
Copyright © Cambridge University Press 1897

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References

page 290 note 1 Mém. Com. Géol. (St. Petersburg), vol. vi, 1888, pp. 469 and 556 Google Scholar, pl. ii, fig. 26. See also Brit. Assoo. Report for 1889, p. 66.Google Scholar

page 291 note 1 Proc. Zool. Soc., Annulosa, , 1849, p. 89, pl. xi, fig. 5.Google Scholar

page 291 note 2 Ibid., 1849, p. 90, pl. xi, flg. 7; and 1860, p. 188.

page 291 note 3 “Monogr. Foss. Esth.,” 1862, p. 103, etc., pl. iii, figs. 18–29Google Scholar; and GEOLOGICAL MAGAZINE, 1890, p. 389, Pl. XII, Figs. 1, 2.Google Scholar

page 291 note 4 “Monogr. Foss. Esth.,” 1862, p. 189 Google Scholar, etc., pl. ii, fig. 37; and GEOLOGICAL MAGAZINE, 1890, p. 387.Google Scholar