\N\I-M. 111 B, i:m N- BOU \ 

 |ic<-imeii \\nli < M 'iii:il itc->. \c-irlv til'l\' \ a rici ic- ha\e been 



bed. 



\|,\ci run-ideivd tin-in I'ivalve -hclK ;iii.| < ICM- ri I >d I tlirin 

 under tin- name <>f .l/'/vr/, >/> ; I >rs|oiii>vhamps with tin- -amc iin- 



-I..H, called them Mmistrrni : d'Orbi-jiiN thought them \>'. 

 I' i-irriin-tlr^. :iinl I)->h:t\> lu-lirvnl tin-in to !)< tin- u;i/./:i rU "f 

 A iiinmiiito : Co(|ii:iinl cnnipinvd them with 7V//f//*y^s/x. fiinl tln-v 



uiilv n-x, -inlilc in >oiiic ili-ii'ivr th.-it ^rini-. :i- well ;is 

 truth is m J{ct,-nino>rf 'n. cic. 



A. LAMXLLO8T 8, l':irk. I'l. 104, lii'. ."iT-'J. Oxl'onl Clay, ^ 



. 

 T. i. ATI s, Urown. IM. 1>4, iiii'. J)?;") </. 



TRIOONBLLITES associated with an Aiuinoiiitf. IM. Ki4,ii.u'. ">T4. 



A.NAPTYOHU8, Oppel, Horny and flexible, in a single 

 piece. 



A-MK-iated with the Ariclc* o-roup of Ammonites. 

 Anaptychus of AMMONITES COSTATUS. PL 104. figs. 575, 576. 



UKAKS OF TETRAUHANCHIATES. 



These are found associated with fossil Nautili and occasionally 

 llclemiiito. but never with Ammonites. The upper beaks have 

 been described under the name of PxiivNCHOLiTES, the lower 

 ones as CONI IIOKHVNCHUS. 



K. ASTIERIANA, d'Orb. PL 104, fig. 577. 



r. AN IUOSTIUS. Bronn. PL 104, fig. 978. 



('. OWFAII. r.ronn. PL 1 04. lir. f>7'J. 



I'KI/I \i:ioN, Deslongchamps. This was formerly believed to 

 be the mandibnlar armature of tet rabranchiates, consistin<r of 

 circular or transversely-oval calcareous plates, with rounded 

 anterior and produced and truncated posterior ma ruins. Throurli 



the researches of M. Orosse (J<>r. </< C<>H<-!I.. :i eer., \v .".7. 



L875), there is no doiibi that the-e 1'eltaria- are operciila of 

 >|M-eie> of Xrrifn/iti* ; they resemble t he opercilllllil of the 



A . radula. 



Several specie- ha\c been described from I". Lias to Coral- 

 line I; 



