38 
PALEONTOLOGY OF NEW YORK. 
face ornaments do not differ materially from those in some varieties of iV. buci- 
num and N. liratus (Pal. N. Y., vol. v, pt. 2, pp. 407, 412). 
Distribution. In the shales of the Hamilton group, near Cumberland, Md. 
Nautilus parallelus. 
TLATE CXXVI, FIGS. 3-5. 
Nautilus parallelus, Hall. Fifth Ann. Kept. State Geologist. Expl. pi. (12(5) 11, tigs. 8-.'). ISStl. 
Shell small, gradually enlarging to the aperture; volutions not embracing. 
Transverse section lenticular, with acute lateral angles. 
Chamber of habitation nearly twice as long as the transverse diameter, 
very gradually expanding to near the aperture, which is constricted. 
Siphuncle sub-central. 
Surface marked by fine lines of growth and by elevated longitudinal lines 
or slender ridges, which are distant from 2 to 3 mm. 
The chamber of habitation has a length of 60 mm. on the ventral side 
and a transverse diameter of 29 mm. at the last septum. The ventro-dorsal 
diameter at the same point is 16 mm. 
The single imperfect specimen representing this species in the collection, 
was recorded as doubtfully from the Chemung group, at Salamanca, N. Y. 
The character of the rock and general appearance of the specimen do not 
agree with other fossils obtained from that locality, but closely resemble 
specimens from the coal measures of Ohio. It is probable that the specimen 
was misplaced in the collections and erroneously referred to the Chemung 
group of New York. 
The species also represents a Carboniferous type of Nautilus, and is related 
to the genus Temnocheilus, Meek, and to species classed as Gyroceras by De 
Koninck, obtained from the Carboniferous rocks of Belgium. 
Distribution. Probably from the coal measures of Ohio. 
Nautilus (Discites) Ammonis. 
PLATE CXXV, FIG. 1. 
Nautilus (Discites) ammonis. Hall. Pal. N. Y., vol. v, pt. 2, p. 425. 1879. 
