ORDKR II 



AMMONOIDKA 



B87 



Cosmocero*, Waagen Fjr. li'27.-; /'// //></, v,-,,x, gen. nov. Tyj.e /'. Amm.) 



Taylori, d'Orl.. .-p.: Stgaloccras, gen. nov. Type N. (Amm.) oalkvinue, d'Orb. .-p. 



Middle Lias to Oxfordian. 



Family 28. Pedioceratidae. 



Young resemble (\^ninc,'rnHtl,i>^ but later 



the large single or imperfectly bifurcated 



costae are apt to cross the venter. Some- 

 times all traces of tubercle- are lost, but 



most forms possess until a late -tag" a ro\\ 



on the veil tro-lat era 1 angles, another in 



juxtaposition to thi> externally, and either 



two more or none inside these rows. 



Pedioceras, (lerh. : Itiniri/l, !>< r.<, 



<!nss. (Fig. 1228); Steueroceras, Cos-m. 



(Odontoceras, Steiien : l>i,uli,rlin<-i-nix, gen. 



nov. Type D. (Amm.} //,Wnx,, t w/f //////, 



J'Orb. sp. Cretaceous. 



Family 29. Anisoceratidae. Tncoiled shells with only two row- of 



on either -ide. and costae 

 similar to those of preceding 

 family. The adult Aniso- 

 ceras has a Helicoceran 

 aspect, develops a long, 

 eccentric Toxocera*-\\ k e \ < >\ u - 

 tion in the gerontic stage, 

 and terminates with a n-t ro- 

 ve rsal bend or crook. 



Anisoceras, Pict. ; Tono- 

 ccrti^ gen. nov. Type T. 





,.. 1228. 



DouvUlefoeras iimiiu/lmr. Sclilotli. sji. (iaiilt ; .Mai-hiToiiK'-nil, Anli> 



Duvalianum, d ; 0rl>. sp. ; Hyphantoceras, gen. nov. 

 Type H. (Heteroc.) ^o/.s-.<//r/ /////, Sdiliit. .-]). Cretaceous. 



Family 30. Turrilitidae. Tnrriliticones having 

 more or less angulatel volutions, with two rows of 

 tubercles on either side of the median line of the venter. 

 Shells close-coiled from the earliest - age, or with only a 

 slight eccentric deviation in old age; often partially 

 costate, and sometimes with only three POWB f tubercles 

 in older stages. Aperture much elongated iransvei.-el\, 

 and contracted in extreme age of Tnrrilites by ingrowth 

 of the right side. Costae continuous across the venter Tvrrtliti <r>ri. 



or interrupted by a smooth zone, and either single or IS', 1 

 divided between the rows of tubercle.-. 



Tnrrilites, Lam. (Fig. 1229) ; Ostlingoceras, gen. nov. Type t). (Tun:) I'ttzvsianum, 

 d'Orb. sp. Cretaceous. 



Family 31. Ancyloceratidae. Includes only such forms usually a-signed to 



