AMMOXOIDKA 



Wissriibarh, 



Nassau. 



Nepionic indiv 



Fi... II '.'I. 



i, Bryr. 

 A, H, 



sp. Lower Devonian; 

 Natural caste, >/i- (', 



Sail(ll). (Kig. 11:>0>. In tlij>, )|,e ,,nly grllll.-, the -hell i- 



gradually tapering, and round or mm pressed ellipti.-al in -e.-iion. Devonian. 



Family -2. Nautilinidae. (Nautttmi, I ievnYh, ,/,-,. Mini.i.-ei-a.-,, n ,- and am- 

 monitirones, rounded 

 or more or less quad- 

 rangular in section. 

 Sutures have narrow 

 saddles on either side 

 of the undivided 

 ventral lobe, and 

 broad lateral lol>e> 

 with saddles at tin- 

 lines of involution or 

 on the umbilical 

 zones, when the latter 

 are differentiated. 

 Antisiphonal lobe 

 aliM-nt. Dorsuni with 

 a broad azygous 

 saddle. Aperture 

 with a deep and 

 narrow hyponomic 

 sinus, crests on the 

 ventro-lateral angles, 

 and broad lateral 

 sinuses on either side. 



(Fig. 



Mimocerc^'BjaM *^; 



FIG. 1120. 



ttl'itl'X I'll'lJII II*, 



Upper 



Biidcshoi 



De- 



Anar- Eifel. A, Conch, i/ a . 

 B ' Suture - line, 3/j 

 (after sandberger). 



Fn;. U-2-2. 



J//<,'.rsto plebejus, Barr. sp. Lower Devonian (6tage 

 i) ; Hlubocep, Bohemia (after Barrande). 



1121); 



Mnia 

 MOja 



1122, 1123); Prolo- 



bites, Karp. ; Agoniatites, Meek (Aphyllites, p.p. Mojs.), (Fig. 1124); 



gen. nov. Type P. (Gon.) lituum, Barr. sp. Devonian. 



A narcestes subn<i >i till n us, 

 Hchloth. sp. Middle Devonian; 

 Wissenbach, Nassau (cf. Fig. 

 L004> 



Agoniatites occultus, Barr. Lower Devonian (tage O); 

 Hlubocep, near Prague, Bohemia (after Barrandr). 



Family 3. Aphyllitidae. Freeh. Ammouiticones with truncated venters. 

 Sutures similar to those of Nautilinidae, except that a dorsal azygous lobe is present. 

 Aphyllites, Mojs. Type A. ambigena, Mojs. Dorsal sutures unknown. V<n-<>- 

 gen. nov. Type P. (Gon.) tabuloides. Dorsuin of this involute form i> 



