28 
NAUTILOIDEA. 
Sp. Char. Section circular. Kate of increase very slow, some- 
times scarcely perceptible. Septa direct, tbeir distance slightly 
exceeding the shell-diameter. Length of the body-chamber from 
10 to 16 times the diameter of the base, so that the body of the 
mollusk was probably nearly the lougest known in this genus. 
Siphuncle subcentral, with cylindrical elements, very slightly con- 
stricted at the necks of the septa. Surface smooth. 
Horizon. Etage E, bande e 2 (= Salopian). 
Locality. Dworetz, Karlstein, Bohemia. 
Eairly well represented. 
Orthoceras Hagenowi, Boll. 
1857. Orthoceras Hageyiowii, Boll, Beitrag zur Kenntniss der Silur. 
Ceph., in Archiv fiir die Naturkunde von Mecklenburg, p. 22, 
Taf. vi. if. 19, a-c. 
1869. Orthoceras Hagenowii. Karsten, Die Verstein. des Uebergangs- 
gebirges in den Gerollen der Herzogthiimer Schleswig und Hol- 
stein, p. 60, tab. xviii. fF. 3, a-c. 
1869. Orthoceras Hagenowi, Heidenhain, Ueber Graptolithen fiihrende 
Diluvial-Geschiebe der norddeiitschen Ebene, p. 21. 
1878. Orthoceras Hagenowi, Haiipt, Fauna des Grapt. Gest. p. 53. 
1880. Orthoceras Hagenowi, Angelin and Lindstrom, Fragmenta 
Silurica, p. 7, tab. v. ff. 14-17, tab. ix. f. 7. 
^p. Char. Section circular. Kate of increase in the septate part 
of the shell 1 in 6 Septa undulating, distant about k the diameter 
of the shell. Body- chamber unknown. Siphuncle eccentric, 
situated between the centre and the margin. Surface smooth. 
Horizon. Dpper Ludlow h 
Locality. Island of Gothland, Sweden. 
Kepresented by a single fragment. 
Orthoceras (?), sp. 2. 
1852. Orthoceras, sp. 2, Salter, in Sutherland’s ‘ Voyage in Search of 
Sir John Franklin,’ Appendix, p. ccxxiii. 
^ The Silurian Rocks of the island of Gothland have been hitherto regarded 
(mainly on the authority of Sir R. I. Murchison) as equivalent to the Wen* 
lock Limestone of this country. But the investigations of Roemer and 
Helmersen show that other divisions are present, and I am informed by Dr. 
Lindstrom that the Gothland strata, whence the rich Cephalopodous Fauna of 
that island is derived, “must in age correspond nearly with the Upper 
Ludlow.” 
For a detailed account of the stratigraphy of the island of Gothland see 
Dr. Lindstrom’s valuable memoir, “On the Silurian Gastropoda and Pteropoda 
of Gothland,” Kongl. Svenska Vetenskaps-Akad. Handlingar, Bandet xix. 
Hafte 6, p. 5 (1884). 
