272 
the jDOsition and diameter of the siphuncle. Mr. McCoy has referred to 
O. striatum a Devonian species which Phillips confused with O. ludense, which 
is Silurian, and vdiich besides being longitudinally striated, differs by the oval 
shape of its transverse section, and the excentric position of its siphuncle. 
Horizon and Localities. — This beautiful species was found in 1812 
by M^ood and Wright, in the black Carboniferous Limestone of Cork, where 
it seems rather rare. Mr. Clarke found the magnificent specimen I have 
figured in a brownish micaceous limestone at Wollongong, and some fragments 
in Pussell’s Shaft. 
Orthoceuas Martiniaxitm (?), L. G. de Koninck} 
P]. XXIV, Pig. 3. 
OrtJlOCeras Martinianum, L. Gr. de Koniuck, 184.3, Degcr. Anim. Poss. Terr. Garb. Belg., 
p. 505, pi. 41, fig. 4. 
This rather small shell is thin, elongated, decidedly conical, and per- 
fectly smooth outside. Its septa are only slightly vaulted and rather close 
together. The distance between them equals nearly one-fourth of their 
diameter. The siphuncle is very small and rather excentric. 
Limensions . — The length of this fragment is twenty-six millimetres, 
the greater diameter four and a half millimetres, the lesser diameter two and 
a half millimetres, and the apical angle about ten degrees. 
Lelations and Lifferences. — I should without hesitation have placed 
this specimen with O. inequiseptum, Phillips, as it is exactly the same shape, 
had not the learned English geologist mentioned as one characteristic of 
O. inepuiseptum that the septa are very far apart in young individuals ; 
they are rather close together in O. Martinianum. It differs from my O. 
calamus by being much shorter, and by its much greater apical angle. 
Horizon and Localities . — I found this species in the Upper Car- 
boniferous Limestone at Vise, where it is rare. In Australia it is found in 
a dark-grey limestone in the Ichthyodorulite Lange on the banks of the 
Karua River. 
[See also R. Etheridge, Junr., Gfeol. and Pal. Qdaiid., 1892, p. 293. — W.S.D.] 
