144 
NAUTILOILEA. 
devonicans, Barrande \ G. validum^ G. paucinodum, and G. trans- 
versum, HalP), which may be regarded as evolute Temnoelieili. 
Whether these are the ancestral forms of Temnocheilus or not, the 
genus is first recognized in the Devonian of Nassau, in the species 
described by G. & F. Sandberger under the name Nautilus sub- 
tuberculatus, and is well represented in the Carboniferous of England, 
Ireland, Belgium, the United States, and India. In the first-named 
country we have Nautilus tuherculatus J. Sowerby ; in Ireland 
N. coronatus^, M‘Coy. In Belgium the last-named species is re- 
corded by de Koninck "" in the Belgian rocks, and he also identifies 
the N. {Temnocheilus) latus of Meek and Worthen 
In the United States several species of Temnocheilus have been 
described from the Coal-Measures of Illinois, among which may be 
mentioned Temnocheilus latum, Meek & Worthen, T. Winslowi 
M. & AY., T. Goxanum AI. & AA^., T. spectahile AI. & AA’’. 
To these species may be added the Disci tes” tuherculatus of 
D. D. Owen from the Carboniferous Limestone of Iowa Point, 
Alissouri Eiver, Iowa. The specific name of this species, however, 
must be changed, because Temnocheilus tuberculatum is preoccupied 
for J. Sowerby’s species ; I propose, therefore, to substitute for the 
latter name Temnocheilus Oiueni. 
Dr. W. AYaagen established three sections for the reception of 
the Nautilidoi of the Productus-Limestone of the Salt-Ilange, India^“, 
^ S 5 'st. Sil. de la Boheme, 1866, vol. ii. pt. i. pi. ccxl. 
^ Nat. Hist, of New York, Palaeontology, 1879, vol. v. pt. ii. 
3 Mineral Conchology, 1819, vol. hi. p. 90, pi. ccxlix. f. 4. 
^ Synop. Carboniferous Foss, of Ireland, p. 20, pi. iv. f. 15. 
® Faune du Calcaire Carbonifere de la Belgique (Annales du AIus. d’Hist. 
Nat. de Belgique, tom. ii.), pt. i. p. 115, pi. xxiv. f. 2. 
® Geol. Surv. of Illinois, 1873, vol. v. Pabeont. p. 608, pi. xx.x. ff. 2 a, '2 b. 
7 Ibid. p. 609, pi. xxxii. ff. 2 a, 2 b. 
® Ibid. p. 543, pi. xxxii. ff. 1 a, 1 b. 
^ Ibid. I860, vol. ii. Palaeont. p. 308, pi. xxv. ff. 1 a, 1 b. 
Geol. Surv. of Wisconsin, Iowa, and Minnesota, p. 581, pi. v. f. 14. 
Mem. Geol. Surv. of India —Palaeont. Indica, ser. xiii. Salt-Eange Fossils, 
1879, vol. i. pp. 42-47. 
This great series of rocks is thus subdivided by Dr. AA^aageu : — 
VIZ. : — 
I. — Siliceous-limestone 
Group. 
II. — Speckled Sandstone^ 
Group. 
III.— Mag nesian Sandstone 
Group. 
r Magnesian 
\ Neobolus I 
Lower Productus-limestone. 
Speckled Sandstone. 
Magnesian Sandstone. 
Neobolus Beds. 
