rEALOGY. I 1 



of its first member, t // b a line of descent, though 



of course 1 1 * i ~= can only I onsidered a suggestion derived from Wahner's i: 



' .mil suprat re more or less decidedly channelled, and the 



last inherits well defined keel and channels al an earlier stage than in I I 



Cal. opkmJet \< a very curious Bpecies, with an earlj developmenl of tin- 

 ind channels in Borne \ ;n i«-t it--, and a very late appearance of these in 

 other varieties, as Bhown by Wahner. This Bubseries appears in Central Europe 

 in a few keeled and channelled forms. 1 



Tin- third subeeries includes also Cal. laticarinatum, a varietal modification of 

 ( ording t" Wahner, and this leads into several Bhells with much 



depressed and very stoul whorls, Buch ;i- ( I uroideg, an 



- separable from I the earl 



accelerated developmenl of the keel, and the broad and depressed abdomen. 



i is :il<n ;i Bubseries including only the curious Cal. Sebamtm described by 



Neumayr, which appears to be a form of Caloceraa, possiblj Boinewhat similar t<> 

 tlu' equally remarkable Cal. (a I Wiirtemburg. 



This enumeration -hows thai the Bpecies of the Northeastern Alps, if arranged 

 in natural order, would probably form :i greater number of Bubseries in thai 

 ice than in Central Europe, though for convenience' Bake we have here 

 1 them in the same number of subsei 



Verniiceran Series. 



young of V turn* before the quadragonal form is fully 



•ped, has :i stage in which it approximates both in size and characteristics 



bo closeh t.> some varietii I I that sepai ition is nol natural. The 



comparison of Fig IT and 18, Plate I., with Fig. 23, Summarj Plate XI . shows 



the tendency of this - the production of varieties with channels like th 



The transition from I has been recognized 



by many paleontologists; in facl it is nol possible to separate these B| 



erne forme I have much Btouter young, and usually 



>p the channels and keel ;it a much earlier 



I ' - the usual broad varieties, with late developmenl of keel 



and channi § iaeAiand the like, and also a form which acquires tuber- 



U form "I D'Orbigny, and lose* them again either in the adull or 



- the tir-- senility. From this form the transition to oph 



the adull ' form al a very early age, and also fain I 



tubercles, is natural and i 



I of V ' quite dis- 



tinct from those of I > - Bhowed an in tendency to 



. the abdomen became narrower, the pilsa obsolescent, and thi 



1 In vei ndencj finally obliterated all I 



- V , ■ 



