94 
NAUTILOIDEA. 
Horizon. Iberger-Kalk ; Upper Devonian. 
Locality. Grimd, North-western Hartz. 
Kepresented in the Collection by two small fragments. 
Orthoceras dimidiatum, Sowerby. 
{Ante^ p. 52.) 
1840. Orthoceratites dimidiatus, Munster, Beitrage zur Petrefactenkunde, 
Heft hi. p. 98, Taf. xix. ft*. 2, 5. 
1879. Orthoceras semicingulatum, Giimbel, Geogn. Beschreib. des 
Fichtelgebirges, in Geogn. Beschreib. des Konig. Bayern, .\bth. iii. 
p. 498. 
RemarTcs. There are two fragmentary specimens in the Collection, 
bearing the characteristic ornamentation of this species. 
Horizon. Orthoceratiten-Kalk ; Upper Devonian. 
Locality. Elbersreuth, Bavaria. 
Kepresented by two fragments in the Collection. 
Orthoceras subannulare, Munster. 
(Ante, p. 59.) 
Horizon. Orthoceratiten-Kalk; Upper Devonian. 
Locality. Elbersreuth, Bavaria. 
Represented by one small fragment. Also found in the Silurian. 
Orthoceras speciosmn, Miinster. 
1840. Orthoceratites speciosus, Miinster, Beitrage zur Petrefactenkunde, 
Heft iii. p. 96, Taf. xviii. ft*. 1 a, 1 6, 3. 
1879. Orthoceras speciosum, Giimbel, Geogn. Beschreib. des Fichtel- 
gebirges, in Geogn. Beschreib. des Kcinig. Bayern, Abth. iii. p. 498. 
Sp. Char. Shell straight. Section circular (?). Rate of increase 
about 1 in 6. Length of body-chamber not precisely ascertainable. 
Septa varying in distance from J to | the diameter. Siphuncle 
central (?). Surface of test smooth. 
Horizon. Orthoceratiten-Kalk ; Upper Devonian. 
Locality. Elbersreuth, Bavaria. 
Fairly well represented in the Collection. 
Orthoceras conoideum, Miinster. 
1840, Orthoceratites conoideus, Miinster, Beitrage zur Petrefactenkunde, 
Heft iii. p. 96, Taf. xviii. ft*. 4, 5. 
1879. Orthoceras conoideum, Giimbel, Geogn. Beschreib. des Fichtel- 
gebirges, in Geogn. Beschreib. des Konig. Bayern, Abth. iii. p. 498. 
Sp. Char. Shell straight, tapfering rapidly. Section circular (*?). 
Septa distant about | of the diameter. Siphuncle central. Surface 
of test quite smooth. 
