NAUTILID^. 
43 
could not be properly referred to the genus Litiiites, in which Hall 
had placed them. But d’Orbigny’s genus Crijptoceras'' , in which 
Professor Chapman suggested that the Lorette specimens should be 
placed, is very imperfectly characterized, the ventral position of the 
siphuncle, upon which d’Orbigny relied, being a feature common 
also to Trochoceras. It may be added that Cryptoeeras now falls 
into the synonymy of SolenocJieilits, Meek & Worthen”. 
Horizon. Black Eiver (=Llanyirn Series — lower part). 
Locality. Lorette, near Quebec, Canada. 
Kepresented in the Collection by two examples. 
Family NAUTILID^H. 
Genus TROCHOLITES, Conrad I 
[^Nautilus, J. de C. Sowerby, 1839^; Clymenia, Eichwald, 1842'’; 
Litiiites, de Verneuil, 1845®; Lituites (pars), d’Orbigiiy, 1849'’^; Lituites, 
Saemann, 1854® ; Lituites, Salter, 1855® ; Lituites {TrochoHt/ms), Schmidt, 
1858 ; Lituites, Lessen, 18G0 ; Lituites, Roemer, 1831 ; Biscoceras, 
Barrande (pars), 1867 ; Biscoceras (Lituites), Kjerulf, 1879 ; Bisco- 
ceras (pars), Angelin (fc Lindstrom, 1880^®; Palceoclymenia, Palceonautilus 
(subgenera), Remele, 1881^® ; Lituites, F. Roemer, 1885 *’.] 
Gen. Char. Shell depressed, planorbiform, having three or 
four involute whorls, transversely elliptical to subquadrangular in 
^ Prodrome de Paleontologie, 1849. \ol. i. pp. 58 & 114. 
2 See in this volume under Solcnocheilus. 
® Ann. Geol. Report, 1838, p. 119; sec also Journ. Acad. Nat. Sci. Phila- 
delphia, 1842, vol. viii. pt. ii. p. 274, which contains the revised generic descrip- 
tion of Trocholites (see Pal. of New York, 1847, vol. i. p. 192). 
^ Sil. Syst. pt. ii. p. 642. 
® Die Urwelt Russlands, Heft ii. p. 33. 
® Geologic de la Russie d’Europe, vol. ii. pt. iii. p. 360. L. Odini—L. teres, 
E icliw., Schichtensyst. von Esthland, 1840, p. 105, which supersedes it. 
Prodr. de Paleont. Stratigr. vol. i. p. 1. 
® Palaeontographica, Band iii. p. 166. 
® Tn Sedgwick & M'Coy’s British Pal. Foss., Appendix A, p. vii. 
Archiv fiir die Naturkunde Liv-, Ehst- und Kurlands, p. 198. 
” Zeitschr. der Deutsch. geol. GeseU. Band xii. p. 23. 
Die Foss. Fauna der Silurisch. Diluvial- Geschiebe von Sadewitz, p. 62. 
Syst. Sil. de la Boheme, vol. ii. pt. i. p. 177. 
tJdsigt over det sydlige Norges geologi. Atlas, pi. xvi. (Biscoceras (Lituites) 
antiquissimum). 
Fraginenta Siluvica, p. 10 (Biscoceras convolvens ; not of Hisinger). 
Zeitschr. der Deutsch. geol. GeseU. Band xxxiii. Heft i. p. 13. 
Lethaea Erratica, in Palaeont. Abhandl. Band ii. Heft v. p. 68. 
