-l\l II. OB 0X1 SOI K ER \N BB \\< ll 221 



are | 6 ,<////. and therefore retain 1 1 1 • - separate Appellation 



In hint There is also i | ible relationship with the Oryn. Oppeh of the Middle 



which makes it desirable t" keep it separate, for the present at least, from 

 G i. It" it id a distinct species, or even a distinct variety, ( '■ ghi^'xi 



may !><• the immediate ancestor of OppeU. 



Oxynoticoras Oppeli. Sea 



miiimi.. ri. \ in i 

 I S XII I p 101, pi I 



! 



. 



The peculiar Mont form <>i this Bpeciesal the same age distinguishes it readily 

 from the Middle L aer of the Bame name described and figured by 



Q uens ted t.' The ~t- >ut form "t' the young, gibbous Bides, and the blunted abdo- 

 men, show that it may have been a member of a Bubseries in which Aba 



ie first representative in the Lower Lias. Th<- figure by Dumortier exhib- 

 prominent keel even at the diameter <>i 165 mm. Scblonbach's specimens 

 ili«l not completely lose tin- keel until over ">oo mm. in diarrn 



per in bis Liass. Ceph. Hierlatzh. Sallstadt gives G 



and a form allied t<> the latter under the name of Oxyn. ■ < also 



ndetermined Bpecies and a distorted form, named J These are 



all small ami dwarfish, except the first, which, however, cannot be called large, 



the largest individual measured bj Geyer having been found to !»<• only 71 mm. 



in diameti 



1 A 



