4 GEOLOGICAL MEMOIRS. 



here) lies, in both locaUties, at a somewhat higher horizon. Below 

 this zone comes A. migulafMS with Cardinia concinna, Chemnitzia 

 Zenkeri, Turbo Philemon, &c. Below this the zone of Ammonites 

 planorbis is laid open in one or two calcareous beds. The strata 

 which are the object of our investigation begin immediately below, 

 and in the two sections given above they occupy different levels with 

 respect to the important horizon of the Bone-bed. 



Table of the Mollusca of the " Kossen-beds '* in Suabia. 



Above, and with, 



the Bone-bed 



(Nellingen, Bir- 



kengehnen, &c.). 



Below the Bone- 

 bed (Nurtin- 

 gen). 



Other localities. 



Acteonina, sp.* 



Anatina prsecursor, Quenst. 



sp 



Cardium Rhaeticura, Merian 



Cardium cloacinura, Quenst. 

 Cypricardia Suevica, 0pp. 8^ 



Suess 



Leda DefFneri, Opp 



Neoschizodus posterusf, 



Quenst. sp 



Schizodus cloacinus, Quen 



stedtX, sp 



Avicula contorta, Port 



scarce 



scarce, 

 scarce 



frequent. 



scarce. 



scarce. 



scarce 



very frequent, 

 very frequent. 



G ervillia prsecursor, Quenst. § 



sp 



Mytilus minutus, Goldf.\\ ... 

 Pecten Valoniensis, Defr.... 



frequent 



very frequent- 



very frequent. 



very frequent, 

 frequent, 

 very frequent. 



Scesa-Plana (Vor- 

 arlberg) ? 



Kbssen Strata in 

 the E. Alps. 



r Kossen Strata of 

 1 Scesa-Plana ? 



Kossen Strata of the 

 E. Alps Ireland 



Kossen Strata of the 

 E.Alps; Ireland; 

 France. 



In the former of these localities the shells lie immediately beneath 

 the zone of Ammonites planorbis, in a sandstone-bed from 3 to 10 

 inches thick, at the base of which the Bone-bed is developed, as at 



* The internal cast here alluded to may possibly belong to the species, from the 

 Eastern Alps, identified with A. alpina, Klipst. sp., by M. Merian (Escher, " Vor- 

 arlberg," p. 19). 



t Prof. Quenstedt is right in remarking the striking similitude of this species 

 to Trigonia curvirostris, Goldf., occurring in the Muschelkalk, and which Prof. 

 Giebel has recently taken as the type of his new genus " Neoschizodus " (Ver- 

 stein. v. Lieskau, p. 39). This species is at present only known by some small 

 indistinct internal casts, and by a larger cast, perhaps the original of Professor 

 Quenstedt's figure (tab. 1. fig. 3). 



J Opts cloacina, Quenst. We think that the systematic position of this small 

 shell is not yet sufficiently cleared up, but at all events it seemed to us to be 

 wrongly placed in the genus Opis. 



§ Some specimens show feeble radial strije. It bears some affinity to G. sub- 

 striata, Cred. (Leonhard und Bronn, " Jahrbuch," 1851, p. 621. pi. 7. fig. 7). 



II See Goldfuss, " Petrifacta Germaniae," pi. 130. fig. 6 ; Alberti, " Monogr. d. 

 Trias," p. 153 ; Quenstedt, pp. 29, 31. pi. 1. figs. 14, 36. The locality is erro- 

 neously spelt by Goldfuss : it is ** Tiibingen," and not " Tiibingen." 



