XAHTILID^. 
101 
lobes. Siphuncle nearly central. Surface of the test marked only 
with lines of growth. Type, Sautilus fermtus, Cox^. 
Carboniferous. 
Remarl's. Hyatt observes that “in the American species, and 
perhaps in all, there is a slight dorsal saddle in the centre ” of the 
shallow dorsal lobe. Only four species of this singular form are 
known, viz. Xautilus hilohafiis, J. Sowerby, A", clitellarius, J. de Carle 
Sowerby, X. ferratus, Cox, and E. costatwn, Foord. 
Bphippioceras bilobatum, J. Sowerby, sp. 
1819. Xautilus hilohaius, .J. Sowerby, Min. Couch, vol. hi. p. 89, pi. 
ccxlix. if. 2, 3. 
1883. Eiyhippioceras hilohatum, Hyatt, Proc. Boston Soc. Nat. Hist, 
vol. xxii. p. 290. 
Sp. Char. “A nearly globose shell, with the front [periphery] a 
little flattened, the umbilicus is small and nearly cylindrical: the 
siphuncle is central, on each side of it the septa are remarkably 
concave, so as to form two elliptical lobes. It is nearly as thick as 
wide.” {Soiverly.) 
Remarlcs. This species is closely allied to E. clitellarium, J. de C. 
Sowerby, but is clearly distinguished from it by its more flattened 
and much less expanded sides, and consequently less rapid rate of 
increase, and by the greater height of the whorls in proportion to 
their width. 
Horizon. Calciferous Sandstone. 
Locality. Closeburn, Dumfriesshire. 
Kepresented in the Collection by the type specimens figured in 
the ‘ Mineral Conchology.’ 
Ephippioceras clitellarium, J. de C. Sowerby, sp. 
[See Fig. 13.] 
1836. Xautilus bilobatiis, Phillips, Geol. of Yorkshire, pt. ii. p. 232. 
1840. Nautilus clitellarius, J. de C. Sowerby, Trans. Cteol. Soc. vol. v. 
pt. iii. Explanation of the plates, Ac. pi. xl. ff. 5, o «, 5 b. 
? 1845. Xautilus clitellarius, de Yerneiiil, in Ylurchison, de Verneuil, 
and de Keyserling’s Geol. de la Bussie d’Eiirope, vol. ii. pt. iii. 
p. 365, pi. XXV. ff. 11, a-d. 
? 1848. Goniatites ovoideus, Fischer de Waldheim, BuU. Soc. Imp. des 
Naturalistes de Moscou, no. iii. p. 132, pi. V. f. 3. 
? 1848. Cyrtoceras Fahrenkohlii, Fischer de Waldheim, ibid, p, 128, 
pi. V. f. 1. 
^ Third Report of the Geol. Surv. of Iventucky, 1857, p. 574, pi. x. ff. 2, 2 a. 
