322 
SUPPLEMENT. 
Mediterranen Triasprovinz, in Abhandl. der k.-k. geologisch. Reicli- 
sanst. p. 292, Taf. xciii. if. 9 a, 9 6. 
/Sp. Char. Shell straight, tapering at the rate of about 1 in 10. 
Transverse section elliptical, the ratio of the two diameters being as 
4 : 5. Septa very deeply concave, apparently numerous. Siphuncle 
a little eccentric, sometimes surrounded by a series of radiating lines 
which may represent a depot organipie, but the shell has not been 
seen internally. The test is covered with exceedingly fine lines of 
growth ; it is always broken off at the apex, leaving this part bare. 
The test is admirably preserved, even to the nacreous layer. 
Bemarhs. The best figure of this species is that of Mojsisovics, 
which represents a fragment about 2 inches long, the test being, 
as usual, broken off at the apical extremity. The name Orthoceras 
ellipticum being preoccupied by Munster, was changed by d'Orbigny 
to Orthoceras suhellipticum. 
Horizon. Trias ; Cassianer Schichten (St. Cassian Beds). 
Locality. St. Cassian, South Tyrol. 
Represented in the Collection by two small fragments. 
Genera of doubtful Affinities. 
Genus GONIOCERAS, HaUi. 
{Conoceras, Saemann, 1854^; Orthoceras, Giebel, 1852 Orthoceras, 
Billings, 1863 ^ ; Orthoceras, Safford ®.) 
Gen. Char. “ General form and structure of the Orthoceras ; the 
tube flattened, with extremely salient angles ; septa sinuous ; section 
an extended ellipse, with projecting angles; siphuncle ventral.’^ 
{Hall.) 
BemarTcs. No new light has been thrown upon the affinities of 
this singular genus since it was first described by HaU. Professor 
^ Palseontology of New York, vol. i. 1847, p. 54. 
* Palaeontographica, Band iii. p. 161. 
® Pauna der Yorwelt, Band iii. Abth. i. p. 263. 
^ Geol. of Canada, Appendix, p. 949. 
* Geol. of Tennessee, p. 289. 
