I II I II. OB \'. iSSU ! R W BR \M II 201 



oonvergent, more involute, and smoother, :m<l the sutures more degenerate, l>ut 



the k«t 1. -i) far d, though it may become much depressed, never wholly 



Probabh ill - • d specimens, in what we 



called the nost it such extreme examples have not yet been 



seen by the author. 



Prasi - LKS. 



Astoroceras obtusion, Htj 



ii.-- viii i d i - i . . i \ i |g> i. hn i-i Mil i 



. . II p. 161, pi cIxtiL 



p. 181, pi. xliv. 

 Amm. obtiu-. Jurm, p. 141, pL I 



'■■■.<•»■. Ih » 

 '■'■ 

 Am . 1 V |.. 1 I-. pl 01 



ib. .lur.i. |> 1 10, pl 

 Am- . '• irt , p 15, | 



Amm. Schwab. 10 1 1 



; 1 



Lifts, pl. vii 

 "• . .ii. Bg 1 S : pi. 1\ 



v in . p. 17 I. pl. 1 fig 

 Amm 14, 16. 



Loo; Bempflingi 



\M; sagittarium 



A - from Bempflingen baa pilae, which cross the abdomen. Speci- 



tedt'a « m » •ll^-^-t i< »ii from the same locality Bhow this peculiar deforma- 

 tion, to which i ttention, 1 and compares them with i i, bul does 



of the identification, Bince in another place (p. '_'•">'_' he app 

 ailinit Wr ii of tagittarium with Ja B tea that his 



from the lower part of the Oxynotus bed, that is, from the Obtusus 

 bed of other authors. This fact, and the obvious agreement of the sutures and 



• . and the / deformation common in ; 



1 iny, and their differences when compared narrowly with J . leave 



but little <l<Mi!>t that Wright waa in error in thinking this f<>n :curred in the 



- identical with J I 



<juit<- completely what i- perhaps the most remarkable dogradational nei 



res, P ■ III I I, 2, to 

 of Wmhi remarkably 



example of morphological equivalence. 1 Others 

 men*. both in England and Germany, resemble M in the 



- 



