ii A.M.MONOIDEA 581 



-s. Inner part.- of siitun- -i.-i-j.ly melim-d apir.id, and dor-.il .-itlniv- have a Imi^ 



Sutnn--liiic 

 Ili-iii. .-].. 



FIG. 1211. 



Erymnoceraa coronation, Brag. sp. C;illovian ; 

 Xit'-vn-, France. 1 / :! . 



pair of first dorsal saddles, usually two additional 

 pairs of saddles, and two pairs of lobes. All of 

 these are so decidedly inclined apicad that they 

 often appear as a single pair of complex saddles. 



FIG. 1213. 



Perispliinctcs' jwlyplwua, Hi-in. 

 Upper Jura; PappfiihtMin, Havana. 



These genera are morphic equivalents of the Liassic Dactylioidae and an- derived lV<>m the 



same common stock. Young 

 have depressed trapezoidal volu- 

 tions and often minute tuheirles 

 on ventro-lateral angles, but are 

 otherwise smooth, like the young 

 of Cadoccras sublcr* . They In-- 

 come compressed in m-anir >t.ix' 

 and rapidly as>iiiin- tin- .lix-oi.jal 

 L'eris)ihinetean form and eo>tai- 

 without tllliel'i-les. 



I' i' r ix jili inrt,'x, \\'aa<^eii 



(Gross a a vria, l'mr,-riffx, 

 ('lin/,it;-i, Si.-iiiinul.) (Figs. 

 1212-1214) ; Ataxioe* rat, 



Font. ; I'fiijtliiinilitfx, Tei--. ; 



ricfoiiin, r.ayle ; 



Pavl. and Lainpl. ; 



ceras, ^en. nov. Type /.. 



(Amm.} Ufonenrit, Oj-i 



Inferior Oolite and Cretaceous. 

 l-'ainily 17. Aspido- 



ceratidae. Zittel, p.p. 



Karlicr \<lutinn> ...-Mli-d. 

 later ones with one or \\\n rn\v> <if tnliei-eli-s, tin- inner ru\v ln-in^ develnp-d !ii-i. 

 A'enter broad, ncvei 1 keeled. Sutures nx-mMr tliose nf I>,n-tiili<,i<l,i,-, luit sad<lles 

 and lobes In-oadcr and dorsal sutures with only one lari^- pair of inner or tirst <lm>al 



Thin ii 

 Hundsriick, near Streichen, 



FII . 1-J14. 

 1 sp. I'ppi-r Jura 





