GOiTPHOCEEATID^. 
21 ' 
the body-chamber by a constriction. The septa have a consider- 
able convexity, J the diameter. The sutures are direct, and the 
sipbuncle | the diameter from the ventral edge.” . . . {Blake.') 
Remarks. The above is the description of the type specimen, and 
to this may be added the following particulars : — “ The section is 
very often elliptic ; but it is presumed that this is due to compres- 
sion, as the inequality of the axes is never very great, and the 
longer one is always in the plane of symmetry. The body-chamber 
is the only part that has been preserved in any examples 
The shell was thick, and bad rough transverse annulations and lines 
of growth. The septa are very convex, up to of the diameter. 
The sipbuncle is ^ of the diameter from the edge, and is bulbous. 
The type is as large as any that are found.” {Blake.) 
Remarks. Blake compares G. crater with G. decurtcUmn, and 
G. microstoma of Barrande, but be observes that these differ from 
bis species “ in the details of the aperture and the less convexity of 
the septa.” 
Horizon. Wenlock. 
Loccdity. Dudley, Worcestershire. 
Represented by two very imperfect specimens. 
Gomphoceras ellipticum, M‘Coy, sp, 
1839. OrtJioceras jyyrifonne, J. de C. Sowerby, in Murchison’s ‘ Silurian 
System,’ pt. ii. p. G20, pi. viii. ff. 19 (lower fig. only), 20. 
? 1847. Gomplioceras ovum, Barrande, Ilaidiuger, Bericbte fiber die 
Mittbeil. von Freund, d. Naturwiss. in Wien, Band iii. p. 269. 
1851. Poterioceras ellipticum, M^Ooy, Ann. Mag. Nat. Hist. ser. 2, 
vol. vii. p. 45. 
1852. Orthoceras {Poterioceras) ellipticum, M^Coy, British Pal. Foss, 
fasc. ii. p. 321. 
1854. Phraymoceras pyriforme, Monis, Cat. of British Foss. 2nd ed. 
p. 312. 
? 1867. Gomphoceras ovum, Barrande, Syst. Sil. de la Bobeme, vol. ii. 
pt. i. p. 295, pL Ixxv. ff. 10-12, pi. Ixxxiv., pi. cv. ff. 12-14. 
1867. Gomphoceras pyriforme, Dixon, ‘Woolbope Nat. Field Club,’ 
Fossil Sketches, No. 1, f. 4, p. 136. 
1882. Gomphoceras ellipticum, Blake, British Foss. Cepb. pt. i. p. 190, 
pi. xxii. ff. 1, 1 «, 4. 
Bp. Char. “ Elliptical, last chamber conoidal ; greatest width at 
last septum, from whence the chambered and unchambered portions 
taper elliptically to the contracted mouth and attenuated extremity : 
septa nearly horizontal, the last three or four about two lines and a 
