Plagiostomoceras cf .angustum (HOLZA PFE L, 1895)

1. Apical p rt of a shell with inflated embryonic part supposedly broken off, Z PAL N/509 ; Late Frasnian , Plucki by Lagow, Pol and ; x 5.

2 . Fragment of an adult living chamber (a , b ), ZPA L N/511 ; same locality as above .

3 . Adult (3) living chamber in dorsal (a) and lateral (b ) view s. ZPAL N/521. Early Frasnian, Rokiczany Dół by Debnik near Cracow, Poland .

4. Longitudinal , slightly oblique sectio n through a phrugmocone. ZPA L N/551; Early Farnennian. bed J . 7, Jablonna .Poland ; note the variation in chamber length .

Plagiostomoceras cf. angustum (HOLZAPfEL, 1895); Late Frasnian, Plucki, Holy Cross Mts, Poland;

a Reconstructionof the living chamber ;

b longitudinal section through a siphuncle, ZPAL N /516.