380 
SrPPLEMEXT. 
1874. Orthoceras intermedium, Barrande, ibid., texte, pt. iii. p. 70*2. 
1880. Orthoceras intermedium, Angelin and Lindstrdm, Fragmenta 
Silurica, p. 7, tab. y. ff. 9-12. 
1888. Orthoceras intermedium, Lindstrom. List of the Fossil Faunas 
of Sweden, ii. Upper Silurian, p. 7. 
Sjp. Char. Shell (cast) straight ? Transverse section circular. 
Kate of increase about 1 in 12. Body-chamber unknown. Septa 
numerous : their distance from each other about 4 of the shell- 
diameter. Sutures slightly undulating. Siphuncle excentric, 
situated at a point about two-fifths the distance across the diameter. 
The segments of the siphuncle var}- in character, i. e. they are num- 
muloidal towards the smaller extremity of the shell, where their 
breadth is to their height as 7 : 4 ; at the larger end this ratio is 
reversed, their breadth in relation to their height being nearly as 
4 : 7. The test is not known. 
Beraarhs. This species may be compared with Orthoceras Ludense, 
J. de C. Sowerby (=0. columnare, Marklin,0. Dahlii, Barr.), but it is 
easily distinguished by its more numerous septa, and the peculiar 
variation in the form of the siphuncle. 
Honzon. Upper Ludlow. 
Locality. Island of Gothland, Sweden. 
Kepresented in the Collection by a single example (2so. C. 2874). 
DEVOXIAX SPECIES. 
Orthoceras Chinense, Foordh 
Since the description of this species was published in Part I. of 
the present Catalogue, a remarkably fine, almost perfect specimen, 
has been presented to the Museum. The test, hitherto unknown, 
may he pronounced to be smooth, as it is marked only with exceed- 
ingly fine, irregular transverse striae. The rate of increase is 
rapid, nearly 1 in 9. The specimen is 3 feet 2h inches in length ; 
its greatest diameter is 5 inches, its smallest h an inch. 
Horizon. Devonian? 
Locality. 30 miles north of Ichang, in the province of Hoo-pe, 
Clhina. Presented by X. M. Tankowsky, Esq. 
See Pt, I. of the present Catalogue, p. 100. 
