i ii in. OB \'. \--ii r.i: \s r.KAN. ii 195 



tin* prolong nee of the goniatitic proportions, which are generally con- 



fined to DJepion owth in other Aminonitinoa. They are :i 1 -» « very 



similar in some of tin- nealogic and adult >th in form and characteristics, 



if we except the sutures, to Psilocei tcquire 1 1 * « - deep arietinn 



abdominal lobe quite early in life. The sutures of Uie bigher i 



in \i\ similar to those "i Coroniceras The affinil 

 I '//.and also tliose with P liave been fully 



In the clinoloj the abdomen becomes n 



ami ! smooth. NeumayT has lately redescribed tlu~ genua in part 



under the name of < \ mb 



Agassiceras Isevigatum. Htati 



rial.- \lll lit- ill s, ,<,,.,, II Mil. lit. I. 



A mm - " ' 



-1 

 Amm ■■■ 1 1 v Aiimi Ili.-rl.-S. I. - 1-17 



Cyii' 



I 



Tli - baa an exc lingly immature or naepionic form. Ii seems 



omplete its growth in five whorls. The aperture baa a simple 

 i rostrum, the lateral edges slightly flaring, with a broad shallow coi 

 tinn. PI. \ 111 Fig 12, very similar to the aperture ofOppel'a typ< I 



The living chamber ia al t one half a volution in length. 



Var A. Plate VIII. Fig. II. Thia ia Bmooth during four volutions, and tin' 

 pita, if prt developed only on the lasl whorl. The whorls are more 



compr 1 than in other varieties, and the umbilicus no! so deep. 



Var B. Plate \ 111 I a '. ia Bmooth onlj during the first three or three 

 ami a half whorls, and then has immature folds liki- those "i var 



'.. The younger whorls are wider than in other varieties, and the 

 umbilicus dee| 



Var C baa the pita much more distinct, but the period al which thej appear 

 \+ the same as in the preceding variety. The pita are apt i" cross the abdomen, 

 forming «liL'lit ridgi - This, like all other characteristics, ia found more i 

 a other » 

 Var d P ■ \lll I j 10-12, ia founded on the presence of a faintly 

 I iti phonal i dge V\m< includes members of other varieties, regardli 

 • which the pita are develope<l, th ei or less prominenci 



• 



\ \ \ I : 

 • u 



lik* '• 



