Prof. T. Rupert Jones — On Swiss Jurassic Foraminifera. 209 



proportion of special forms in each of the stages treated of, the 

 names, on which the numbers will be founded, being here rarely 

 little more than indicative of individuals, or at most of sub-varieties. 

 The figures themselves, having been carefully drawn, are useful 

 as a collection of specimens, ready at hand, exhibiting shades of 

 diflference, as well as the general fades of the several foraminiferal 

 faunae, such as can scarcely be shown in words. 



1. The Lias : Black Jura. — A. The Lower Lias. Turneri-clay of 

 the Schambelen, Canton Aargau ; immediately above the Arietes- 

 limestone, ^ of Quenstedt. Pp. 5-7 ; pi. 1, i., figs. 1-18. 



Nodosarise 3 ; Vaginulinse 5 ; Frondicularige 5 ; Cristellarise 3 ; 

 Textilaria 1 ; Biloculina 1. The NodosarincB (figs. 1-16) are 

 varieties of N. radicula and other common species (or varieties), 

 already well known. The gradational stages from the subcylindri- 

 cal, costate, and limbate Nodosaria to its flattened Frondicularian 

 form, are clearly seen in figs. 2, 11, and 9. Text, prodomus (fig. 17) 

 is a common variety of the " Sagittula " group. Biloc. liasica (fig. 

 18) wants definition, but may well be a Biloculine Miliola. 



B. Middle Lias. The Numismalis-marl of Frick yielded nothing. 

 C. Upper Lias : Toarcian. 1. Posidouia-shale ; e of Quenstedt. 

 From the Commime of Klingau, S.W. of Zurich, Canton Aargau ; 

 and from near Schleitheim, Canton Schaffhausen. Pp. 8, 9 ; pi. 1, 

 ii., figs. 1-6. 



Frondicularia 1 ; Vaginulina 1 ; Cristellariae 4. Common and 

 well-known feeble forms, not requiring new names. 



2. Jurensis-marl (immediately above the Posidonia-shale) ; ^ of 

 Quenstedt. From Vetznau. Pp. 10-12 ; pi. 1, iii., figs. 1-12. 



Nodosaria 1 ; Frondicularia 1 ; Cristellarise 7 ; Flabellina 1 ; 

 Ophthalmidium 1. Figs. 1-10 are well-known Nodosarince, al- 

 ready named ; among them figs. 3-10 show the passages from 

 Cristellaria to Flabellina. Ophthal. liasicum (fig. 11) is the central 

 Cornuspiral or Adelosine commencement of a Miliola.^ A Chirodota 

 (fig. 12) is recognized in the text as belonging to an Echinoderm. 



II. Middle or Brown Jura : Dogger. A. Bajocian : Aalen-series : 

 Lower Brown Jura. a. Opalinus-clay of the Schambelen : and a of 

 Quenstedt : immediately above the Eadians-bed. h. Opalinus-clay 

 of Vetznau. Pp. 13-15 ; pi. 2, i., figs. 1-7. 



Cenchridium 1 ; Lagena 1 ; Cornuspira 1 ; Frondiculariae 2 ; Den- 

 talina 1 ; Cristellaria 1 ; Ophthalmidium 1. 



Cenclir. Aargovense (fig. 1) and Lagena Aargovensis (fig. 2) are 

 the long and the short varieties of Lagena globosa. Cornusp. Hel- 

 vetica (fig. 3) is a very interesting example of Spirillina. Figs. 4-6 

 {Nodosarince) were not worth naming anew ; indeed fig. 5 is equal 

 to fig. 2, i., pi. 1. Fig. 7 (Oph. porosum) is a Spiroloculine Miliola, 

 'prohahl J punctate, although described as being ^orose (see further on). 



c. Blagdeni-bed, immediately above the Humphresianus-bed, but 

 below the main oolite of the Middle Brown Jura : B of Quenstedt. 

 From the Vetznau. Pp. 15-17 ; pi. 2, ii., figs. 1-12. Nodosariae 

 3 ; Frondiculariae 3 ; Marginulina 1 ; Cristellarise 2 ; Flabellina 1 ; 

 Ophthalmidium 1. 



1 See further on in the notice of the " Appendix." 

 TOL. X. — NO. cvii. 14 



