74 
Is^ATJTILOIDEA. 
base. Septa distant about ^ the diameter. Siphuncle central at 
the smaller end of the shell, but sometimes a little eccentric at a 
later stage of the growth. Surface ornamentation consisting of 
narrow grooves or impressed lines running longitudinally the whole 
length of the shell, with narrow, slightly raised bands between them. 
The intervals between the grooves are a little irregular, so that the 
bauds are of unequal breadth ; as a rule about four of the latter are 
contained in the space of 1 line, one much narrower than the rest 
being occasionally intercalated. The bands are almost flat, as in 
Orthoceras originale and 0. striato-punctatum^ described below. 
The surface of the bands is perfectly smooth, with the exception of 
some very fine transverse striee observed in one specimen. No 
trace of the ornaments of the test is preserved upon the internal 
cast of the shell. 
Remarhs. Barrande compares this sj ecies with 0. planicanali- 
culatum, Sandb. (Verstein. Nassau, p. IGl, pi. xviii, f. 4), from the 
Orthoceras- Schiefer (Middle Devonian). The latter, however, has 
wider septa and a greater space between the bands. 
Horizon. Etage E, bande e 2 ( = Salopian). 
Locality. Wiskocilha, Bohemia. 
Fairly well represented in the Collection. 
Orthoceras striato-punctatum, Miinster. 
1840. Orthoceratifes striato-punctatm, Miinster, Beitr. z. Petrefacten- 
kimde, Heft hi. p. 101, Taf. xx. tf. 1 -0. 
1852. Orthoceratifes striafo-pimcfatus, Quenstedt, Handb. der Petre- 
faktenkuude, p. 342. 
1868. Orthoceras striato-punctatum, Barrande, Syst. Sil. dela Boheine, 
vol. ii. Texte hi. 1874 (janvier), p. 227, pi. cdxviii. ff. 18-24, 
pi. ccccxx. if. 12-16, pi. ccccxlvh. if. 14-21. 
Sp. Char. Shell straight. Section circular. Bate of increase 
about 1 in 6. Length of body-chamber at least 4 times the 
diameter of its base. Distance of septa about the diameter. 
Siphuncle central, c^dindrical, about the diameter of the shell. 
Surface ornaments consisting of narrow, longitudinal grooves 
diverging gradually from the smaller end of the shell towards the 
aperture. These grooves separate a series of regular, flat bands, 
whose maximum width is nearly 1 line ; their surface is quite 
smooth. The grooves, on the other hand, are each of them orna- 
mented with a series of minute, equidistant punctures, of which 
about five occupy the space of 1 line ; they leave no trace of their 
existence on the cast. The bands may be easily removed from the 
surface, when it is found that they are doubly convex, so that in 
