ORTHOCERATID^.. 
93 
Horizon, Cuboides-Kalk ; Upper Devonian. 
Locality. Iberg, Switzerland. 
Represented by two small fragments. 
Orthoceras irregulare ?, Miinster. 
1840. Orthoceratiles irregularis, Miinster, Beitrage zur Petrefacteii- 
kunde, Heft iii. p. 100, Taf. xix. f. 11. 
Sp. Char. Characterized by its irregular transverse striae. Per- 
haps Giimbel ^ is correct in making this species synonymous with 
0. lineare, but the specimen in the Collection is not sufficiently well 
preserved to afford conclusive evidence on this point. 
Horizon. Oithoceratiten-Kalk ; Upper Devonian. 
Locality. Elbersreuth, Bavaria. 
Orthoceras subregtJare, U. A. Roemer. 
1843. Orthoceratites regidaris, F. A. Roemer {non Schlotheim), Die 
Verstein. des Harzgebirges, p. 35, tab. x. ff. 4, 5. 
1854. Orthoceras suhreyulare, F. A. Roemer, Beitr. z. geologisch. 
Kenntn. des nordwestlichen Harzgebirges, in Palaeontographica, 
Band iii. p. 110. 
18G6. Orthoceras suhregulare, F. A. Roemer, Beitr. z. geologisch. 
Kenntn. des norddeiitschen Harzgebirges, Abtli. 5, in Palaeonto- 
graphica. Band xiii. Lief. v. p. 231. 
Sp. Char. Shell straight. Rate of increase about 1 in 7. Length 
of body-chamber about 2| times the diameter of its base. Septa 
distant less than ^ the diameter, therefore numerous. Siphuncle 
central. Surface of test smooth. 
Horizon. Ibcrger-Kalk ; Upper Devonian. 
Localities. Grund, Winterberg, North-western Hartz. 
Fairly well represented in the Collection. 
Orthoceras pulchellum, F. A. Roemer. 
1854. Orthoceras pulchellum, F. A. Roemer, Palseontographica, Band 
iii. p. 39, tab. vi. f. 6. 
Sp. Char. Shell straight, subcompressed. Rate of increase about 
1 in 7. Septa distant about j the diameter. Siphuncle marginal. 
Surface ornamented with very strong, undulating transverse striae, 
which have an upward imbrication. The striae make a very distinct 
impression upon the cast. 
Remarlcs. This species is doubtless allied to 0. cUmidiatum, Sow., 
but the imbrications are more distant. 
^ Loc. cit. (see p. 89). 
