292 
NA.UTILOTDEA. 
situated close to the concave border of the shell, without, however, 
touching the test ; it is cylindrical. The surface of the test is 
ornamented with striae, which in several examples are stronger upon 
the septate part of the shell than they are upon the body-chamber. 
Remarks. The species having the nearest affinity to this one is 
M. imhelle, Barr., sp. (pi. clxvii.), which is easily distinguished by its 
greater curvature, its less developed body-chamber, and by the fine 
longitudinal lines upon its test in the septate part of the shell. 
Horizon. Etage E (= Salopian). 
Locality. Wiskocilka, Bohemia. 
Eepresented in the Collection by a single example. 
Cyrtoceras (Meloceras) expandens, Barrande, sp. 
1867. Cyrtoceras expandens, Barrande, Syst. Sil. de la Boheme, vol. ii. 
pt. i. p. 659, pi. clxvii. ff. 11-14. 
Sp. Char. Shell nearly straight. Transverse section circular. 
Bate of increase of the septate part of the shell about 1 in 2. 
The body-chamber occupies nearly one half of the entire shell, 
while its bulk is at least four times that of the septate part. The 
distance between the septa is equal to about tV the diameter of the 
shell. The siphuncle is close to the concave border without touching 
the test, it is cylindrical, but very slightly inflated between the 
septa. The test is ornamented with regular, close-set imbricating 
striae, of which there are from 6 to 8 in the space of a line. The 
septate part of one of the specimens in the Museum Collection is 
beautifully ornamented with light-coloured zigzag bands resembling 
those figured by Barrande in M. Iridis, Barr., sp. (pi. cliii. f. 21). 
Remarks. This species is readily distinguished from its congeners 
by its very rapid expansion, forming an angle of about 30°. 
Horizon. Etage E ( = Salopian). 
Locality. Karlstein, Bohemia. 
Eepresented in the Collection by three examples. 
Cyrtoceras (Meloceras) forte, Barrande, sp. 
1867. Cyrtoceras forte.^ Barrande, Syst. Sil. de la Boheme, vol. ii. pt. i. 
p. 660, pi. clxi., pi. clxxiv. tf. 1-8, pi. clxxvi. ff. 1-4. 
1877. Cyrtoceras forte, Barrande, ibid. Suppl. et Ser. tardive, p. 24, 
pi. ccccxxv. ff. 32-35, pi. cccclxix. fi. 6-9 j p. 143, pi. dii. ff. 9-12. 
Sp. Char. Shell nearly straight. In adult specimens it is found 
that upon a chord of 150 millim. subtending the concave side the 
highest perpendicular measures 6 millim. The transverse section 
is sometimes subcircular, sometimes oval. The ratio of the two 
