EXDOUEEATIDJE. 
151 
Remarhs. The only species I can find comparable with this is the 
Orthoceras [Endoceras'] Brongniartii of Portlock (not Conotiibularia 
Brongniartii of Troost), from the Bala beds of Desertcreat, Co. 
Tyrone. The present species is, however, distinguished from Port- 
lock’s by its much more rapid rate of increase, and by the position 
of its siphuncle, which is close to the margin, instead of being at a 
little distance from it, as in the former species. 
Horizon. Bala Limestone. 
Localitu. Worthin, Shropshire. 
Represented by the type specimen, which was presented by R. J. 
Moore, Esq. 
Endoceras Rottermundi, Barrande. 
1824. Orthoceras, sp., Bigsby, Trans. Geol. Soc. ser. 2, vol. i. p. 197, 
pi. xxvi. f. 2. 
186G. Endoceras Rottermimdi, Barrande, Syst. Sil. de la Boheme, 
vol. ii. Texte iii. 1874, p. 749, pi. eexx. ft‘. 9-11. 
? 1832. Endoceras {Cameroceras') ///«/?« ;«,MTiitfield, in Chamber- 
lin’s Geol. of Wisconsin, vol. iv. pt. 3, Palaeout. p. 230, pi. vii. 
ff. 15, IG. 
Sp. Char. These cannot all be made out owing to the incom- 
pleteness of the type, as well as of another specimen referred to 
this species. The shell appears to have been elongated, and the 
rate of tapering may be roughly estimated at 1 in 5. The trans- 
verse section is circular. The septa are direct and very numerous, 
being, on an average, about lines distant from each other, whero 
the shell-diameter is about 3 inches. The siphuncle is marginal 
and very large, its diameter being about ^ that of the shell, where 
the diameter of the latter is 3^ inches. A large sheath occupies 
the centre of the siphuncle. No trace of the test remains. The 
length of the fragment figured by Barrande corresponds with that 
of its greatest diameter, viz. 3^ inches. 
Remarks. This species bears a considerable resemblance to E. 
suhannulaium, Whitf., but it differs in its circular section and more 
rapid rate of increase. Regarding the former character Professor 
Whitfield states that his species has an oval section, “ the relative 
diameters being as three to four.” The siphuncle in E. suhannu- 
latumi^ described as being “proportionally large, fully equalling one- 
half the shorter diameter of the outer tube.” In this respect it agrees 
with the present species, as also in the close proximity of its septa. 
The exact locality whence Comte de Rottermund obtained the 
specimen figured by Barrande is not known, but the latter states 
that it was found “on one of the islands in Lake Huron, on the 
