Note 9 — Blind Trilobites.
Reading edition
In American Journ. of Science 1877 p. 265 and 1881 p. 250.
[10] Bullet. U. S. Geol. Survey N:o 30, 1886, pl. 17 fig. 5-6.—Tenth Annual Rept. U. S. Geol. Survey, 1888-89, printed 1890, plate 88, fig. 1, 1 a.
[11] In his paper on »The larval stages of Trilobites» p. 175 Beecher gives a new figure (f. 6), original from Ford's collection, of the larva of Ol. asaphoides, but it is so sketchy that I cannot with certainty make out what it means. I cannot agree with him when he speaks of free cheeks and eyes in these and he is completely wrong when he says that the outer pair of spines belong to the free cheeks etc. (p. 176).