142 
NAUTILOIDEA. 
ridges. An inner lobe is present. The sutures form a broad and 
deep sinus on the sides of the shell, and make a slight backward 
curve on the periphery. The siphunclc is situated somewhat below 
the centre. 
Horizon. Trias (zone of Ccratites trinodomu). 
Loocdit]). Schreyer Alpe, Gosauthal, near Hallstadt, Upper 
Austria. 
Eepresesented in the Collection by a single example. 
Genus TEMNOCHEILUS, M‘Coy \ emend. Meek*. 
{Endolohus, Meek and Worth en ' ; Cnjptoceras (pars), d’Orbiguy * ; 
Moniliferi (pars), Quenstedt ^ ; Oniati (pars), de Koniuck ; Mojsvaro- 
cer«s, Hyatt ' ; Solenoceras (pars), Hyatt ^ ; Group of Xauti/iis subtuber- 
culatus, Waagen®.) 
Gen. Char. ‘‘ Shell subdiscoid, with a large, generally deep umbi- 
licus, and a broad flattened or moderately convex periphery ; volu- 
tions usually little embracing, much widened transversely, and 
angular, and sometimes subnodose around each prominent lateral 
margin ; septa merely a little arcuate on the margins ; surface with 
only marks of growth.” (Meel-.) 
Type, Nautilus coronatus, M‘Coy 
Devonian to Carboniferous. 
BemarTcs. The subgenus Endolohus was proposed by Meek and 
Worthen (Zoc. cit.) “ for a large Nautilus, not diflfering very mate- 
rially ill form from species that seem to fall into the group Temno- 
cheilus . . . but which is provided with a kind of lobe, or flexure, 
of the septa on the inner side.” This character, however, as Meek 
goes on to observe, occurs in other species, which upon all other 
^ Synop. Carboniferous Foss. Ireland, 1844, p. 20. 
- Eep. of the United States Geol. Surv. of the Territories, 1876, vol. ix. 
p. 490. 
^ Proc. Acad. Nat. Sci. Philadelphia, 1865, p. 259. 
^ Prodr. de Paleont. Stratigr. 1849, vol. i. p. 58 (not p. 114). 
^ Petrefactenkunde Deutschlands, Band i. Abth. i. p. 53. 
® Faune du Calcaire Carbonifere de la Belgique (Ann ales du Mus. Koy. 
d’Hist. Nat. de Belgique, tom. ii.), 1878, pt. i. p. 90. 
According to Dr. K. A. Zittel, this should be Mojsisoceras. Proc. Boston 
Soc. Nat. Hist. 1883, vol. xxii. p, 269. 
8 Ibid. p. 286. 
® Mem. Geol. Surv. of Indiq — Palseont. Indica, ser. xiii. Salt-Eange Fossils, 
1879, vol. i. p. 46. 
Synop. Carboniferous Foss. Ireland, 1844, p. 20, 
