GOMPHOCEEATID^. 
233 
has been abruptly arcuate, the length of the remainiug part being 
four times as great on the outer as on the inner side of the curve. 
The greater and lesser diameters of the septa are about as 7 to 10. 
The siphuncle is submarginal. The cast of the outer chamber is 
marked by what appear to be regular vascular impressions, extend- 
ing outwards from the first septum. 
“ This species differs from the P. Hector, Billings \ of the Guelph 
Limestone of Canada, in being more narrowly elliptical in section 
and much more expanded in the dorso-ventral direction at the aper- 
ture as well as in the greater length and more extreme constriction 
of the intermediate poilion of the aperture.” 
Pemarhs. Comparing G. Nestor with Eiu’opean species, it is found 
to be nearest to G. rex, Barr., but is differentiated therefrom bv 
the fact that the convex side of the body-chamber is much more 
elevated than the concave side ; the reverse of this is the case in 
G. rex. The two species have, however, a strong resemblance to 
each other in their robust habit, distance of septa, curvature, &c. 
Horizon. Niagara Group (Wenlock). 
Locality. IVabash, Indiana. 
Bepresented by a single example. 
DEVONIAN SPECIES. 
Gomphoceras ? 
[Cf GomjjJioceras Jicus, Boeiner, Palseontogi’aphica, 1854, Baud iii. 
p. 38, tab. vi. ff. 1, a, 6.] 
This is represented by a cast of the body-chamber and most of 
the septate part of the shell. The latter is small and fusiform, the 
greatest length being 1 inch 9 lines, the greatest diameter, which 
is at about the mid-length, is II lines. The septa are direct and 
distant from each other a little more than one line. The aperture 
is not seen. The label accompanying the specimen gives the hori- 
zon and locality as “ Up. Devonian, Nismes and as the appearance 
of the fossil resembles that of other specimens from the same 
locality, there is every probability that the statement is correct. 
Gomphoceras (?) subfusiforme, Munster, sp. 
1840. Orthoceratites {Gomphoceras?) subfusifoimiis, Miinster, Beitrage 
zur Petrefacteukuude, Heft iii. p. 103, Taf xx. f. 8 (not ff. 6, 7, 9). 
^ Palaeoz. Foss. 1862, toI. i. p. 163, ff 147 a, h. 
