132 
ORTHOCERA SteinhauerL 
TAB. LX.— Fig. 4. 
Spec. Char. Shell transversely striated, very 
gradually tapering; chambers very deep; 
septa distant,, even-edged, circular; siphuncle 
close to one side. 
The depth of the chambers, the distance of the septa, and 
the width of the shell, are equal to each other; the siphuncle 
is large in proportion to the shell, being half a line where 
the shell is half an inch. The striae on the surface are very 
regular and even. 
This neat specimen was found accompanying the Am- 
monites Listeri, Brit. Min. t. 455, about two miles and an 
half north of Halifax, on the road to Bradford, in lumps 
of Limestone mixed with much Pyrites, by the Rev. H. 
Steinhauer, whose merit in research deserves esteem and 
remembrance. 
ORTHOCERA Breynii? Mart . Pet. Derh» 
T. 39. F. 2. 
TAB. LX. — j Fig. 5. 
Spec. Char. Shell plain, oval, gradually elongated 
septa oblique, slightly concave, ovate, numerous; 
siphuncle near the middle, small. 
The siphuncle is placed in the focus of the broader end of 
the oblique septa ; the outer shell is very thin, plain, and 
much incorporated with the stone. 
