94 
Sorizon and Locality . — It is found in the black argillaceous limestone 
of the Yass District. 
Oenus — BELLEROPHON, Montfort. 
Bellerophon convolutus, L. O. de Koninch. 
PI. IV, Fig. 4. 
Lellcvophon TF^Cnloclcensis ? Phillips, 1841, Pal. Foss. Cornwall, p. 108, pi. 40, fig. 203 
{lion Sowerby). 
Shell small, composed of five or six spiral whorls, rather close, strongly 
investing; shell thin and surface smooth. The breadth of the last whorl is 
almost equal to the total height of the shell. The umbilicus is narrow and 
deep. Back rounded. Mouth crescent-shaped, broader than high. 
Dimensions . — Diameter, five millimetres ; width of the mouth, four 
and a half millimetres ; thickness of the last whorl, one and a half millimetres. 
Relations and Differences . — This small species, which J. Phillips has 
with some doubt referred to the young stage of Bellerophon Wenlochensis, 
Sowerby, differs from that species not only in size hut also in its less globose 
shape, and especially in the number and closeness of its spiral whorls. 
Horizon and Localities . — In England in the Devonian limestone of 
Newton- Bushel, and in Australia in the black limestone of Yass. 
Genus — MURCHISONIA, d'Archiac and de Verneuil. 
1. Murchisonia vernetjiliana, L. G. de Koninch. 
JKurchisonia angulata, D’Archiac and de Yemenil, 1842, Trans. Geol. Soc. London, Y (2), 
p. 356, pi. 32, figs. 6 and 7 {non B, angulata, Phillips). 
,, Verneuiliana, L. G. de Koninch, 1843, Precis elem. Geol, d’Omalius 
d’Halloy, p. 516. 
,, ,, Idem, 1843, Descr. Anim. Foss. Terr. Carb. Belg., p. 411, pi. 38, 
fig. 5. 
,, angulata, Goldfuss, 1844, Petrel. Germ., Ill, p. 26, pi. 172, fig. 5. 
Bleurotomaria angulata, G. Sandberger, 1850, Yerstein. Khein. Schichten-Syst. Nassau, 
p. 204, pi. 24, fig. 19. 
Shell elongate, turrited, spiral angle about 38°; it is composed of eight 
to ten spiral whorls separated by a deej) suture and divided into two almost 
equal parts by two well-marked keels serving as boundaries for the hollow 
