56 
NAUTILOIDEA. 
the septa attains a maximum of about one fifth of the ventro-dorsal 
diameter. The siphuncle is situated close to the convex border. 
The ornaments of the test consist of fine subregular striae of growth, 
which form a distinct sinus upon the convex border, the lateral 
wing-like expansions leaving also their mark upon the sides of the 
shell in the shape of a very distinct imbrication in the outer layer of 
the test. 
Remarlcs. This species is distinguished from all its congeners by 
its remarkable ornaments. 
Honzon. Etage F (=Downtonian). 
Localities. Konieprus, Mnienian, Bohemia. 
Well represented in the Collection by numerous specimens, one of 
which was presented by J. E. Lee, Esq., E.G.S. 
DEVONIAN SPECIES. 
Gyroceras ornatum, d’Archiac & de Yerneuil, sp. 
1832. Spirilla nodosa, Goldfuss, in von Dechen’s Handb. der Geognosie 
von H. T. de la Beche, p. 536. 
1832. Cyrtoeera ornata, Goldfuss, ibid. 
1833. Hortolus convolvans, Steininger, Mdm. de la Soc. Gdol. de France, 
vol. i. pt. i. p. 370, pi. xxiii. ff. 3, 3 a. 
1837. Spirilla nodosa, Broun, Lethaea Geognostica, Zweite aufl. Band i. 
p. 102, Taf. i. ff. 4, a, h. 
? 1841. Cyrtoceras ?iodosum, Phillips, Pal. Foss, of Cornwall, Devon, 
and West Somerset, p. 116, pi. xlvi. f. 221. (Perhaps not of 
Goldfuss.) 
1841. Cyrtoceras (?) hdellalites, Phillips, ibid. p. 117, pi. xlvii. ff. 223, 
a, b. 
1842. Cyrtlioceratites ornatus, d’Archiac and de Yerneuil (Goldfuss, 
Bonn Museum), Trans. Geol. Soc. 2nd ser. vol. vi. pt. ii. p. 349, 
pi. xxviii. ff. 5, 5 a, 5 b. 
1849. Spirulites nodosus, Quenstedt, Petrefactenkunde Deutschl., Band 
i. Abth. i. p. 48, tab. ii. S'. 10, a, b. 
1849. Gyroceras convolvens, d’Orbigny, Prodr. de Paleont. vol. i. 
p. 52. 
1849. Gyroceras Goldfiissi, D’Orbigny, ibid. 
1852. Gyi'oceras nodosum, Giebel, Fauna der Vorwelt, Band iii. Abth. 
i. p. 195. 
1856. Gyroceras ornatiim, G. & F. Sandberger, Die Verstein. Nassau, 
p. 137, Taf. xiii. ff. l,la,lb,l c. 
1876. Gyi'oceras nodosum, Ferd. Koemer, Lethaea Geognostica (Leth. 
Palaeozoica, Theil i.), Atlas, Taf. xxx. ff. 2 a,2b. 
1883. Kophinoceras ornatiim, Hyatt, Proc. Boston Soc. Nat. Hist, 
vol. xxii. p. 285. 
