148 
NAUTILOIDEA. 
elongated in the direction of the centre of the umbilicus, beyond 
this area the inner margin of the umbilicus slopes with slight con- 
vexity very rapidly to the tuberculated edge of the preceding whorl 
about sixteen tubercles on each side of each whorl ; the septa 
moderately convex, the edges moderately concave towards the 
mouth, both on the sides and periphery, forming a forward rounded • 
angle on the line where the tubercles are placed ; siphuncle very 
large, central ; last chamber occupying rather more than one third 
of the last whorl. Width of mouth eleven lines ...” {M'Coy.) 
Remarlcs. The above is the best description of this species. Prof. 
M‘Coy’s specimen being more complete than that of Sowerhy, and 
the former being furnished by Sowerhy with “ exact measurements 
and outline of the original specimen,” which, adds M‘Coy, “ agree 
exactly with our example, in the broadly convex periphery, trace of 
the medial ridge, &c.” M‘Coy’s specimen was obtained in the Car- 
boniferous shale of Halifax (Yorkshire), where it was rare. The 
best figure of this species is that of Phillips, but his description is 
very imperfect. 
The type specimen shows very distinctly that the septa are 
furnished with an internal (dorsal) lobe, which is figured by 
de Koninck, but not by Sowerby, who seems to have overlooked it 
in the type. 
I have very little hesitation in uniting de Koninck’s Kauiilus 
latus (not Meek and Worthen’s) with the present species, though 
there is a considerable likeness between Temnoclieilus latus, M. & W., 
and T. tuhercidatus ; but the former is fiattened and has “ two very , 
obscure longitudinal ridges ” along the median line of the periphery, 
and has more quadrangular, less compressed whorls than the latter. 
Horizon. Calciferous Sandstone. 
Locality. Closeburn, Dumfriesshire. 
Represented in the Collection by J. Sowerby’s type, figured in 
the ‘ Mineral Conchology,’ 
Temnocheilus Cricki, Foord. 
Si). Char. This species is represented only by the body-chamber, | 
but the characters it exhibits are so distinct from those of any | 
other species that one is compelled to regard it as new. The frag- 
ment forms a portion of a rather rapidly increasing shell with a 
broad, flattened, or very slightly concave periphery, bounded by 
acute lateral angles. The sides, which are about as wide as the 
periphery, slope a little outwards towards the edge of the umbilicus, 
where they again form an angle, from which there is a rapid, 
