26 
natjtiloidea. 
Localities. British: Dudley, ■Worcestershire— : Hinter 
Kopanina, Kosofz, Lochkow, Butowitz, Bohemia; FeugueroUes 
(Calvados), France. 
The Collection contains a fine series of specimens of this species. 
Orthoceras valens, Barrande. 
1868, Orthoceras valens, Barrande, Syst. Sil. de la Boheme, vol. ii. 
Texte iii. 1874 (janvier), p. 559, pi. cccxxxvii. ft*. 16-18, 
pi. cccxxxv. ft. 1-17, ? pi. ccxxxix. f. 24, pi. cccci. fi*. 1-3, 
pi. ccccxliv. fi*. 13-15, and pi. ccccxii. f. 33. 
Sp. Char. Section circular. Bate of increase 1 in 7. The septa 
vary greatly in their distance apart ; sometimes they are some- 
times even \ the diameter. The length of the body-chamber varies 
between twice and four times its basal diameter ; compared with 
the total length of the shell, it comprises sometimes sometimes 
The siphuncle is central. The surface of the test appears, at first 
sight, to be quite smooth, but in a favourable light faint trans- 
verse lines are visible, but they possess no distinctive feature, and 
must be regarded merely as lines of growth. On one specimen in 
the Collection very fine, close-set longitudinal fines can be made 
out with a lens ; these last are not mentioned by Barrande, and 
they may be only an individual peculiarity. 
Horizon. Btage E, bande e 2 (= Salopian). 
Locality. Butowitz, Bohemia. 
Well represented in the Collection. 
Orthoceras decipiens, Barrande. 
1868. Orthoceras decipiens, Barrande, Syst. Sil. de la Boheme, vol. ii. 
Texte iii. 1874 (janvier), p. 629, pi. ccxvii. ft'. 14-17, pi. ccxxiii. 
ft*. 16, 17, pi. cccxviii. ft. 7-9, pi. cccxxiv. ft. 11-14, pi. cccl. ft*. 1-8. 
Bp. Char. Shell sometimes a little curved. Section circular. 
Bate of increase 1 in 10. Septa increasing gradually in their 
distance apart, ranging between ^ and ^ the diameter. The body- 
chamber varies considerably in length, from a minimum length of 
times the diameter of its base to a maximum of times the 
same ; the mean length appears to be about ^ of the total length of 
the shell. The siphuncle is eccentric, and lies about along the 
diameter. The surface of the test appears to be perfectly smooth. 
Horizon. Etage E, bande e 2 (= Salopian). 
Locality. Dlauha Hora, Bohemia. 
Well represented in the Collection. 
