136 The American Geologist. March, 1896 
The following are the principal scientific works that have 
been published by Mr. Wachsmuth, chiefly with the collabora- 
tion of Mr. Frank Springer: 
18G6. Evidence of Two Distinct Geological Formations in the Burling 
ton Limestone. (Am. Jour. Sci., [2], vol. 42, pp. 1-7, 1866.) 
1877. Notes on the External Structure of Paleozoic Crinoids. (Ibid., 
[3], vol. 14, pp. 115-127 and 181-191, 1877.) 
1877. Revision of the Genus Belemnocrinus, and Descriptions of Two 
New Species. (Ibid., [3], vol. 14, pp. 253-259, 1877.) 
1878. Transition Forms in Crinoids. (Proc. Acao. Nat. Sci. Phila., 
1878. pp. 224-266, 1878.) 
1879. Revision of the Palaeocrinoidea: Part I, Ichthyocrinoidae and Cy- 
athocrinoida?. (Ibid., 1879, pp. 226-379, 1879.) 
1881. Revision of the Palaeocrinoidea; Part II, Spha?roidocrinoida?. 
(Ibid., 1881, pp. 177-414, 1881.) 
1883. Remarks on Glyptocrinus and Reteocrinus, two Genera of Silu- 
rian Crinoids. (Am. Jour. Sci., [3], vol. 25, pp. 225-268, 1883.) 
1883. Hybocrinus, Hoplacrinus and Brerocrinus. (Ibid., [3], vol. 26, 
pp. 365-377, 1883.) 
1885. On the Challenger Report on the Stalked Crinoids. (Science, 
vol. 6, pp. 138-139, 1885.) 
1885. Description of Fossil Invertebrates. (Illinois Geol. Sur., vol. 7. 
pp. 339-345, 1885.) 
1885. On a New Genus and Species of Blastoids. (Ibid., vol. 7, pp. 
t 346-357, 1885.) « 
1885. Description of a new Crinoid from the Hamilton Group of Mich- 
igan. (Proc. Davenport Acad. Sci., vol. 4, pp. 94-96, 1885.) 
1885. Revision of the Palaeocrinoidea; Part III, Section I. (Proc. Acad. 
Nat. Sci. Phila., 1885, pp. 225-364, 1885.) 
1886. Revision of the Palaeocrinoidea; Part III, Section II. (Ibid.. 1886, 
pp. 64-226, 1886.) 
1887. Summit plates in Blastoids, Crinoids and Cystids, and their Mor- 
phological Relations. (Ibid., 1887, pp., 82-114, 1887.) 
1888. Discovery of the Ventral Structure of Taxocrinus and Haplocri- 
nus, and Consequent Modifications in the Classification of 
the Crinoids. (Ibid., 1888, pp. 337-390, 1888.) 
1888. Crotalocrinus: its Structure and Zoological Position. (Ibid., 
1888, pp., 364-390, 1888.) 
1890. Perisomic Plates of the Crinoids. (Ibid., 1890, pp. 345-392, 1890.) 
1890. New Species of Crinoids and Blastoids from the Kinderhook 
Group of Le Grand, Iowa. (Illinois Geol. Sur., vol. 8. pp. 
157-251, 1890.) 
1892. Description of Two New Genera and Eight Species of Camera tr 
Crinoids from the Niagara Group. (American Geologist, vol. 
10, pp. 135-144, 1892.) 
1895. Monograph of the Crinoidea Camerata of North America. 
(Memoirs of Museum of Comparative Zoology, 2 vols., 800 
pp., and atlas of 83 plates, comprising 1500 illustrations!. IS*. »">. i 
