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



Planorhulina. It differs from fig. 15, pi. 4, i., in its greater number 

 of chambers, and in its septal lines being excavated instead of being 

 filled up with shell-matter (limbate). 



2, Strombian formation : Baden-bed of the Eastern Tunnelwand 

 of Baden, Canton Aargau: "7 alba" of Quenstedt. Pp. 38-39; 

 pi. 4, iv., figs. 1-10. 



Lagena 1 ; Cornuspirse 5 ; Dentalina 1 ; Cristellariae 5 ; Nonionina, 

 1 ; Textilaria 1 ; Ophthalmidia, fragments. 



Lagena Badensis (fig. 1) is L. Icevis. Cornusp. EicJiherffensis (fig. 

 2) is said to show pores when magnified 400 diameters ; if so, it is 

 a Spirillina ; but its habit is decidedly that of a Trochammina. (PI. 

 3, fig. 2, p. 24, also " G. Mchbergensis," is a Trocham. incerta, both 

 by figure and description.) C. elliptica (fig. 3) is an elliptical Tr. 

 incerta. Fig, 4 ( C. convexa, yellowish-grey, transparent ; pores 

 doubtful) appears to be a true Cornuspira, or a Cornuspiral Miliola, 

 very thin. The "Nonionina," being referred to pi. 4, ii., fig. 3, 

 must be regarded as a Planorhulina. The liodosarince (figs. 5-9) do 

 not at all require new names. 



3. Ehinefall-rock : Steraspis-zone (Oppel) : " B alba " of Quen- 

 stedt (?). Lohn and. Bargen, Canton Schaffhausen. P. 40; pi. 4, 

 v., figs. 1-3. 



Cornuspira 1 (=zTroc}iammina ?) ; Vaginulinas 2 (varieties of Den- 

 talina communis) ; Eobulina 1 ; Textilaria 1; Vulvulina 1 {■=Textilaria 

 or Virgulina ?). Chirodotse are also mentioned, and one is figured. 



Appendix : pp. 45-47 ; pi. 4, vi., figs. 1-6. 



Cornuspira Bayonnensis (fig. 1) and G. undulata (fig. 2), from the 

 Tongrian Tertiary beds of Bayonne, are either true Cornuspira 

 or young Cornuspiral Miliolce. OphtJialmidium tongricum (figs. 3 

 and 4), from Bayonne and Dalsberg, and Oph. superhum (fig. 5), 

 from Bayonne, are Miliolce ; the former Spiroloculine ; the latter 

 Quinqueloculine, probably punctate or reticulate. They are all 

 represented . as seen with transmitted light, like the majority of the 

 specimens figured in this memoir. 



1. Cornuspira is here described as having both porose and non- 

 porose species; the division of the simply spiral, discoidal Fora- 

 minifera into Cornuspira, Trochammina, and Spirillina, according to 

 structure and habit of shell, not being known, apparently, to Dr. 

 Kiibler. 



2. OpJithalmidium (formerly called " Oculina " by Zwingli and 

 Kiibler) is defined as having a somewhat Spiroloculine growth, but 

 never being complanate, always attenuate at the ends, and always 

 commencing with a curved subdiscoidal chamber. It may seem 

 convenient to recognize this as a modification of Miliola, especially 

 because the early chamber (or rather the early tubular, continuous, 

 and rarely segmented chambers) of such forms is Cornuspiral, — that 

 is, zoologically equivalent to an incipient Cornuspira. Indeed, 

 when separate, such specimens cannot be distinguished from young 

 or arrested individuals of that genus, which, however, in its full 

 development affects the flat spiral habit of growth, as Miliola 



