1IIIK1'. OB YKKMliT.l; \N BR INCH. 1 13 



etimes identified with Amm. I many, but thai Bpecies has a 



form more hk<- •' ceel, unci entirely distinct sutui 



A Bpecimen from Aldingen, in the Museum of Stuttgardt, shows an entirely 



smooth senile whorl, precisely similar in form to thai described above in the 



collection of the Museum of Comparative Zoology, though it i- nol half th< 



the <i; ng 103 nun. Another from Vaihingen had a living chamber > t i U 



incomplete, though nearly one and h half volutions in leugth. <>n the latter 



pari <>!' the « • : _ 1 1 1 1 1 volution in this Bpecimen the Bides began to become flatter 



and convergent, and on the ninth ;ui<l tenth volutions the form was subtrigona), 



the channels absent, tin- pilsa still prominent though obsolescing, and the keel 



reduced to a i:i i~< -• 1 line; diameter, L63 mm. Another, of nearly the same size 



- II ler'a fig I . agreed closely, the Butures also being 



identical. The form of the whorl is, however, slightly more flattened laterally. 



It belongs to the large variety of and is found, according to Hauer, 



with t . and bituleaius, in the " gelben koasener Schichten of 



I A specimen from Elwangen, labelled Amm. torus, in the Geo- 



i- zone, exhibits all the characteristics of 1 1 * * - large Bpecimen described 



h has larger and Btouter whorls and pilaa than the specimens described 



from the Lower Bucklandi beds, though the sutures and other characteristics 



A Bpecimen of this variety from Aalen also occurs in Professor 



m at Tubingen, with larger and more prominent ]>ila' than 



usual. 



The young and ol I this species at Semur and elsewhere are usually 



identified eithei , or Johnsiotd, because of the resemblano 



of development and senility in the different sj 



Calocoras longidomum, Htatt. 



50, pi wi flg 1. 2 



Thu ind figured by Quenstedt, cannot be classified 



with certainty. Not In. cimens unquestionably referable to the 



cannot positively decide as to its true affinity. It i>. according to 

 Queni tcription, a more immature or primitive form than 



in- alludes emphatically to tin- resemblances between tin 1 young ami 

 He ilso states that the young an- closely allied to the young of 

 i teems to conflict, but tin- sutures, their backward 



ition, and the fact that th>- abdominal lobe, though longer than the supe- 

 rior lal "iily Blightly longer, the not very prominent ami curved piloc <>f 

 Qiien- keel ami slight channels, and the Bomewhat com- 

 1 form of the older whorls, are all ch i similar to tho 

 I r than the French, ami becoming 

 more slowly. The curved pike are not like (aqueiim, and the cylindrical 

 whorl and tendency of the pj| mien in tie 

 connection with 



