T1IIK1". OB VERMK EB \N BRJLNCH. 187 



Caloccras Johnstoni, Htati 



Amm. Juh' - v iix. 



Amm. torus. I aph., p 213, pi. liii. 



.-fiiirri. />.<■/<)>.. • Qokkst., Ami 8 :-' 13. 



Amm. JoAnst,.:,. Ql c-i. Il«id.. pi i. : 



Amm , pi. D 



WmioH : rix. fig. 1, 2 



VII pi. iii ■ 

 id., pi. ni. fig 



I Itr . IV pi x 

 u Bri '"1. « Ihelteuham. 



This form differs from planorbe in the outline of the whorl, which is much 

 narrower, more rotund and gibbous laterally, and in the greater prominence of 

 the pile. 



A specimen in the Museum of Stuttgardl measuring 120 mm., labelled (oriiHs, 



Nurtingen, has a living chamber .-till incomplete, though nearly one volution in 



length. Abdomen is slightly more elevated than in typical adull torus and the 



more inclined, as is usual in old age of this species. Otherwise the Form 



and pilae, especially in the umbilicus, are the same. 



Sutures <>f adull are similar, as far a< seen, to those of Psiloceras, and in old 

 age the lobes and Baddies decrease in Bize, becoming Bimpler in outline. I 

 stedt's specimen, Ggured in" Ammoniten des Schwabiscben Jura," Plate I. I 

 i- 1 In mm. in diameter and shows the effects of senility in tli«' compressed whorl. 

 1 13 Bhows the living chamber t<> have been at leasl one volution in 



length. The typical forms of this Beries are found in the Northeastern Alps, but 

 the distribution is general, a~ has been already noted 1>\ Neumayr. 



In the collection of the Sorbonne at Paris there is one specimen from Beaure- 

 gard precisely similar to that figured by D'Orbigny, excepl that the whorls are 

 much larger and Btouter. In the collection al Munich there are specimens from 

 Pfonsjoch, Kander in Bresgau, and Lyn exhibiting the typical form of 



•/ intil tins reach 1 1 » » - diameter of 1 IS mm. 



\ u; Beauregardiense. 



I . I \..T 



This form from Beauregard in the collection al Semur is l v "> mm. in dian 

 and has whorls increasing more rapidly in size than in the typical J hml m\ but 

 otherw ise does not differ from that spe< 



Caloccras tortile. Hi itt. 



ii IS- 14. laa i I i i .. i i 



Amm. \\\x. 



Amm. 



Amm. k 



Th nerally misinterpreted by German and English paleon- 



Tbe yonn the same bbous whoi 1 as the • 



