BIBLIOGRAPHY OF PALASOZOIC CRUSTACEA 65 
The author remarks that in defining the different species of the genus Encrinurus, use 
has frequently been made of the disposition of the nodes on the joints of the axis of 
the pygidium. Foerste distinguishes E. thresheri from E, ornatus on this characteristic. 
The author gives the axial annulations of some 43 specimens from the Quarry at 
Mount Vernon, Iowa. 
O’Connell (Marjorie). Summary of the distribution and occurrence 
of Kurypterids. 
Geol. Soc. Am. Bull., vol: 24, pp. 498-515, 1913. 
—— Description of some new Silurie Gastropods, 
Bull. Buffalo Soc. Nat. Sci.. vol. XI, 1914, pp. 93-101, plates 1-6. 
Eurypterus Ruedemanni nov. 
——— The habitat of the Hurypterida. 
Bull, Buffalo Soc. of Nat. Hist, Vol. XI, 1916. 
‘The author gives a systematic review of the occurrence of the Eurypterida in each 
eriod from the Cambrian through the Permic. 
Chapter 2. Résumé of the opinions on the habitat of the Eurypterida. 
Chapter 3. The bionomy of the Eurypterid faunas. 
Chapter 4. The Lithogenesis of the Eurypterid bearing beds. 
Chapter 5. The geological and geographical distributions of the Eurypterids, with 
bibliography. 
The conclusion reached by the author, after the study of all the available data, is 
that the Eurypterids throughout their entire phylogenetic history lived in the rivers. 
Schuchert in the earliest fresh water Arthropods, 1916, remarks that Eurypterids were 
marine animals previous to the Devonian, and that towards the close of the Silurian 
they became Eurhaline, or able to live in both salt and brackish water, and after 
Silurian time they probably became wholly restricted to the fresh water. Proc. Natl. 
Acad, Sci, vol. 2, 1916, p. 728, 
Oehlert (D. P.) Sur les Trinucleus de l’ouest de la France. 
Bull. Soc. Geol. France, 3rd ser., vol. 23, 1896, p. 299, plate. 
Trinucleus Bureaui n. sp. The species is remarkable for the large tail. The author 
compares it with 7. ornatus, the Bohemian form. 
T. Grenieri Berg., T. pongerardi Roualt. 
—— — Fossiles Devonian Santa Lucia (Espagne). Primiere partie. 
Bull. Soc. Geol. France, 3rd ser., vol. 23, 1896, p. 299, plates. 
The author describes Cryphaeus sublandiniatus DeVern. 
Cryphaeus (Malladaia) Luciae nov. sp. ‘The author gives a figure in the text of this 
new subgenus, and compares it with Dalmanites and Phacops. 
Cryphaeus Munieri Oehlert, and Phacops Portiert Bayle. 
Cytherella cf. subfusiformis Sandberger. 
— —~ Uralichas Ribeorot des schistis d’Angers. 
Mem. Soc. Geol. France, Palaeontologie, vol. 6, Fas., 1896. 
——— Résumé des derniers travaux sur l’organisation et le develope- 
ment des Trilobites, 
Bull. Soc. Geol. France, ser. 3, vol. 24, 1896, p. 97. 
Triarthrus Beckii Green. 
