232 
NATJTILOTDEA. 
Gomphoceras comes, Barrande, sp. 
1867. Phragmoceras comes, Barrande, Syst. Sil. de la Boheme, vol. ii. 
pt. i. p. 208, pi. Ixiii., pi. ccxliv. f. 13. 
/%>. Char. The curvature of the shell is very slight. The section 
is suboval, of which the narrow extremity corresponds with the 
inner or ventral border. The ventro-dorsal is to the transverse 
axis as 10 : 9, measured near the middle of the septate portion of 
an adult specimen. In the young these axes are nearly equal. The 
rate of increase in the septate part of the shell is in the ratio of 1 : 3 
in a length of 80 millim. The body-chamber occupies about 5 of 
the total length of the shell ; it is slightly ohli(jue in relation to the 
last septum. In its upper part, just below the larger orifice, there is a 
swelling which, however, dies away at the sides. Barrande states 
that he has only seen it in one individual (loc. cit. pi. Ixiii. ff. 1, 2). 
The larger orifice of the aperture is uniformly expanded transversely, 
and leads by a somewhat broad channel to the smaller orifice, which 
is of a broadly oval form. The distance between the septa amounts 
to about 1 of the ventro-dorsal diameter ; they are nearly direct on 
the lateral and concave borders of the shell, but are broadly arched 
upon the dorsal aspect. The siphuncle is placed close to the concave 
border of the shell ; its elements are nummuloidal, the width repre- 
senting about ^ of the transverse diameter of the shell ; their in- 
terior is filled with radiating deposits. The test is unknown, all 
the examples seen being casts. 
Horizoyi. Etage G, bande g 3 ( = Downtonian). 
Locality. Hlubocep, Bohemia. 
Represented in the Collection by one example. 
Gomphoceras Nestor, Hall, sp. 
1864. Phragmoceras Nestor, HaU, 18th Reg. Rep. on the New York 
State Cabinet of Nat. Hist. p. 347, fi*. 7, 8. 
1882. Phragmocei'as Nestor, Whitfield, Geol. of Wisconsin, pt. iii. 
Pal2eont. p. 301. 
Sp. Char. ‘‘ A fragment preserving the outer chamber and several 
of the septa is ventricose, broadly expanded in the dorso-ventral 
direction, knd measuring from the extreme limits of the apertures, 
which are marginal, more than two and a half inches, the length 
of the narrow constriction between them being one inch and a 
quarter. Both the dorsal and ventral apertures are marginal and 
expanded. The length of the outer chamber along the middle is an 
inch and three fourths, and the dorso-ventral diameter in the middle 
of the length is two and a quarter inches. The septate portion 
