99 
tubercles, a little arcliecl, commencing at the anterior suture, but only rarely 
extending to the oj)positc suture ; traversing this there is also a band, smooth, 
and depressed, particularly on the last whorls. The suture is linear. The 
surlace is smooth. The aperture of the mouth is oval. The slightly-thickened 
columella is tAvisted. 
Dimensions. — Length, about eight centimetres ; diameter of the base, 
fifteen millimetres. 
Delations and Differences. — This species has the greatest resemblance 
to Loxonema rugiferum, Phillips, and it is not strange that the learned 
Professor of Oxford has confused this Carboniferous species with the Devonian 
species now in question. In fact, the one differs essentially from the other 
only in its relatively more elongate shape and in the smallness of the spiral 
angle, which is but 12° in the Devonian species, \Adiile it is 18° to 20° in the 
Carboniferous. 
Dorizon and Locality. — Phillips has seen this species in the DcAmnian 
of Brushford, and d’EicliAA'ald in that of Bouregi and Lake Ilmen in Bussia. 
Several specimens of it have been collected by Mr. Clarke in the black lime- 
stone of the Yass District. 
2. Loxonema antiquum, Milnster. 
PI. IV, Pig. 10. 
Tnrritclla antiqiia, Minister, 1810, Beitr. z. Petrefactenkunde, III, p. 88, pi. 15, fig. 17. 
Loxonema suhulala, P. A. Eoemer, 1813, Die Versteinernngen des Ilarzgebirges, p. 31. pi. 
8, fig. 12. 
T iirritella moniliformis, Goldfnse, 1811, Petref. Germ., Ill, p. 103, pi. lOG, fig. 1. 
Uolopella subulata, G. Sandberger, ISnO, Yerstein. Ehein. Schicliten-Syst. Nassau, p. 220, 
pi. 2G, fig. 10. 
Shell having the shape of a very elongated cone, composed of about 
twenty spiral Aidiorls, tbe groAvth of which is regularly progressive ; they are 
slightly arched, and toAvards the anterior suture are provided with a small, 
almost linear ledge, hardly visible to the naked eye. The surface is provided 
Avith very fine oblique lines of growth. The aperture is oval, and a little longer 
than broad. The spiral angle is but 5°, 
Dimensions. — Length, about thirty millimetres ; diameter of the base. 
four.’ 
p 
