ASC0CEEATID2E. 
247 
Fig. 41. 
Aseoceras Boliemicum. — a, longitudinal section, showing .s, s, septa, si, siphimcle, 
reduced from Barrande’s figure (pi. dxiii. f. 15) ; h, ventral aspect of cast 
of the same species (without the test), showing the reduction in size of the 
body-chamber caused by the encroachment of the septa ; c, dorsal view of 
the same individual; d, body-chamber of the same, without the septal 
chambers ; e, transverse section of the fossil taken in the centre ; f, ti’uu- 
cated posterior extremity, showing po.sition of the siphuncle si ; tj, anterior 
extremity showing the simple form of the aperture ap. The letters v, d' 
stand for ventral and dorsal respectively. The figures 5-/ are copied from 
Barrande’s memoir entitled “Aseoceras, prototype des Nautilides,” from 
the Bull, de la Soc. Geol. de France, 1855, ser. 2, tom. xii. p. 157, pi. v. 
ff. 22-25 and 27, 28. Figure g is copied from Barrande, pi. xcvii. f. 22. 
Fig. 42. 
Enlargement of the posterior extremity of Aseoceras Bohemicum, after 
Barrande, pi. dxiii. f. 16. cs, coalesced septa ; s, s, septa ; si, siphuncle ; 
V, ventral, d, dorsal side. 
