198 University of Test; as Bulletin 



somewhat shorter than the one nearer to the umbiHcus. The follow- 

 ing ten auxiliary lobes are much shallower than the two lateral and 

 first auxiliary ones. The first four are still bifid, while the last six 

 seem to be rounded at the bottom or only slightly pointed. A twelfth 

 auxiliary lobe lies apparently on the umbilical wall. The number of 

 the auxiliary lobes and saddles varies with the age of the whorls; a 

 specimen with a whorl 12 mm. high shows only six to seven auxiliary 

 lobes and the corresponding saddles; but here also the first five are 

 clearly bifid. In the first auxiliary lobe of this small individual 

 the branch nearest to the umbilicus is clearly longer than the one 

 nearer to the venter. In the bifid auxiliary lobes the branch nearer 

 to the umbilicus is much longer than the other one, not only in the 

 small but also in large whorls; the lobes are thus entirely 

 asymmetrical. 



The external saddle is very high and relatively broad, an adventive 

 lobe "A" divides it in two unequal parts. The branch Esi, lying on 

 the venter and the contiguous portion of the flank is much higher and 

 complicate than the one nearer to the umbilicus. The ventral flank 

 of Esi is notched by four oblique rudimentary lobes, the opposite flank 

 by four much deeper ones, the lowest of which shows a slight swelling 

 in the middle of the bottom. At the end of Esi very shallow notches 

 at both sides produce a button-like point. Therefore we count on Esi, 

 eight, or if we count the two notches, ten rudimentary lobes. The 

 rudimentary saddles between these lobes are very short and rounded 

 on the ventral flank but very long on the umbilical flank of the branch, 

 the largest being the lowest, which forms the limit of the adventive 

 lobe "A" ; the next higher is shorter, and the following ones decrease 

 rapidly in size, this side of Esi imitating a flank of a tapering pyramid. 

 The adventive lobe "A" is quite conspicuous, oblique, strongly bifid, a 

 relatively high and rather stout, somewhat triangular secondary sad- 

 dle dividing it in two parts. The branch Es2 of the external saddle is 

 tongue-shaped with very slight lateral swellings, constricted at the 

 base ; it leans strongly over to the first lateral lobe and is much shorter 

 and narrower than the first lateral saddle. The first lateral saddle is 

 simply tongue-shaped, but shows in its outline an inclination to be- 

 come trilobate ; it is high, slender, narrow with slight lateral swellings 

 near the middle, constricted at the base and in general quite similar 



