'2\'2 \scorKIt \>. OLOSSOl r:i!.\s. KTc. 



<..-iiu> SYCOCERAS, I'icti-t. 



Shell oval bottle-shaped. straight : septa simple: siphnndc 

 marginal. 



Silurian. Devonian. 

 S. OKTIHM.ASTKK. Saudi). H. ( .7. I'ILI. 4 ( .H. 



Gcnua ASCOCERAS, IJarr. 



Shell flask-shaped ; the terminal chamber not only tills the 

 front of the shell, but extends down the ventral side, nearly its 

 whole [ength, as a deep eavitv. which is embraced liy the decnr- 

 rent edo-es of the four 01- live incomplete septa : a minute si ph uncle 

 on the dorsal side. 



Sixteen specie-. L. and V. Silurian. I'ln n>i : : Gn.mtdti. 

 A. Bon KM in M. Barr. IM. !T. li^. 4 ( .2. 



<;nus GLOSSOCERAS, Han. 



Shell like Ascorct'd*. luit the dorsal mai'ii'in of the apei'tni'c 

 li.irnl.-itely extended and incurve*!. 



Two species. Middle and I'. Silni-ian. An,liro*ti, Jio 



APHRAGMITES, U:.r 



Shell like A#run-rax. luit 1he septa are deci 

 Two specie-. I". Silurian. Bohemia. 



(inuis PHRAGMOCERAS, I!.,,,!. 



Shell conipres>ed <>n tin- sides, curved : aperture contracted in 

 the middle: last chamber larue: siphnncle \ en'ral. wit h radia- 

 tions ; -epta simple. 



Fifteen species. Silurian to Devonian. Enfujn-. 

 Pn. \ KNTIMCOSIM. Stein. IM. '.;, li.n'. 4 '.:;. Silni-ian. Kmjlimd. 

 F'n. r.M.i.is-roMA. Barr. I'l. !>s. lio-. 4.)4. Aperture. 



GenuB GYRCCERAS, M. 



Shell pl:inorloid. with sep:n'Mted whorl-; septa simple, luit 

 little curved; siplmndc -nltdorsal. wit h radiations; last cliam- 

 I'er lariic ; month lint lit t le cont raeted. 



\cnteen species. Silurian to Triassic (''.). Mnro/it; \. 



America. 



i. hi i ii. PI. 98, fig. 495. Devonian. /v//'r/. 



