278 
NATTTILOIDEA.. 
Horizon. Etage E, bande e 1 (= Salopian). 
Locality. Butowitz, Bohemia. 
Well represented in the Collection. 
Cyrtoceras (Meloceras) elongatum, Barrande, sp. 
1848. Cyrtoceras elongatum, Barrande, Haidinger, Berichte iiber die 
Mittheil. yon Freund, der Naturwiss. in Wien, Band iv. p. 200. 
1852. Ci/rtoceras elongatum, Giebel, Fauna der Vorwelt, Baud iii. 
Abth. i. p. 209. 
1867. Cyrtoceras elongatum, Barrande, Syst. Sil. de la Boheme, vol. ii. 
pt. i. p. 499, pi. cix. ff. 1-10, pi. cxvii. ff. 5-11, pi. clvii. ff. 50-55, 
pi. ccii. ff. 16-18, pi. ccv, ff. 16-18, pi. ccviii. tf. 29, 30. 
1877. Cyrtoceras elongatum, Barrande, Syst. Sil. de la Boheme, vol. ii. 
pt. i. Suppl. et Ser. tardive, p. 140, pi, dviii. ff. 9-11. 
Sp. Char. The curvature is considerable, though stronger in the 
apical part than in the rest of the shell. Upon a chord of 90 miUim., 
subtending the eoncave side of the shell, the highest perpendicular 
is 10 millira. The transverse section is a more or less flattened 
ellipse, of which the dorso-ventral is to the transverse axis as 7 : 4 
in one individual measured, while in another it is 7 : 5. The body- 
chamber is short, being not more than i the total length of the 
shell ; it is sometimes crenulated at the base. The distance between 
the septa amounts to about i the ventro- dorsal diameter ; there are 
about 50 septa in adult individuals. The siphuncle is situated upon 
the convex border of the shell, at a little distance from the test ; 
it is cylindrical. The surface of the test is either smooth or marked 
only with indistinct lines of growth. 
Bemarks. M. socials, Barr., comes nearest to this species in form, 
but it is distinguished by the sculpture of the test, which consists of 
regular and prominent transverse plications, whose surface is covered 
with fine striae running in the same direction. 
Horizon. Utage E (= Salopian). 
Localities. Lochkow, Xonieprus, Bohemia. 
Well represented in the Collection. 
Cyrtoceras (Meloceras) fraternum, Barrande, sp. 
1867. Cyrtoceras fraternum, Barrande, Syst. Sil. de la Boheme, vol. ii. 
pt. i. p. 503, pi. cix. ff. 22-27. 
Sp. Char. Shell strongly curved, especially in the apical portion 
of it. Upon a chord of 80 millim., subtending the concave side of a 
nearly perfect specimen, the highest perpendicular is 17 millim. 
The transverse section is oval, of which the narrowest part corre- 
