120 
NAUTILOIDEA. 
f ? 1840. Orthocei'asy sp., Sowerby, Trans. Geol. Soc. ser. 2, vol. v. pi. xl. 
f. 4] 
1876. Orthoceras pygmceum, Armstrong, Young, and Robertson, Cat. 
of tbe Western Scottish Foss. p. 59. 
Sp. Char. A small compressed fragment, elliptical in section, and 
measuring 5 lines in length, consisting of part of the septate portion 
of the shell. The test is perfectly smooth, and so thin and trans- 
parent as to show the septa through it. These are very slightly 
convex and pretty near to each other, so that thirteen or fourteen 
of them can be counted in the specimen. The siphuncle is very 
slender and quite marginal. The rate of increase is about 1 in 5. 
The shell appears to be straight. 
Remarhs. This may be identical with Sowerby’s species, its 
small size, coupled with the marginal position of the siphuncle, 
making the resemblance between the two forms somewhat striking. 
The position of the siphuncle and the decidedly elliptical cross sec- 
tion of this fossil points to its affinity with the Cyrtoceratidae, but 
for the present it is perhaps better that it should remain where 
M. de Koninck has placed it. 
0. pygmceum is recorded in the ‘ Catalogue of the Western 
Scottish Fossils ’ as occurring at Gare, and at South Hill, Campsie. 
Horizon. Coal-Measures (Systeme Houiller), in the calcareous 
nodules of the “ schiste alumineux” of Chockier. 
Locality. Chockier, Belgium. 
Represented in the Collection by the specimen figured and de- 
scribed by de Koninck. 
Orthoceras Iseve, Fleming. 
1793. Orthoceratites . . . superficie Imvi, Ure, History of Rutherglen 
and East Kilbride, p. 306, pi. xvi. f. 3. 
1815, Orthocera Icevis, Fleming, Annals of Philosophy, vol. v. p. 201, 
pi. xxxi. f. 1. 
1840. Orthoceras Iceve, Quenstedt, in Leonhard & Bronn’s Neues Jahrb. 
p. 270. 
1852. 0?'thoce?'as Iceve, Giebel, Fauna der Vorwelt, Band iii. p. 267. 
1876. O?'thoceras Iceve, Armstvong, Young, and Robertson, Cat. of the 
Western Scottish Fossils, p. 59. 
Sp. Char. Shell straight. Section circular, though often much 
compressed, owing to the extreme tenuity of the test. Rate of 
tapering about 1 in 6. Septa numerous and somewhat oblique, 
distant about ^ the diameter of the shell. Surface perfectly smooth. 
The siphuncle is small and central. The test is so thin and trans- 
parent that the septa can be readily seen through it. The dimen- 
