544 



MR. L. F. SPATH ON 



[Dec. 



At a locality which may he that marked ' Bou Goubrine ' in 

 fig. 1 of Baltzer's pi. iii, 1 1 collected a large number of ammonites 

 preserved in red limestone. Most of them had weathered out 

 of the rock, and lay loose at the surface, which was overgrown 

 with brushwood to such an extent that the relations of the out- 

 crop could not be traced clearly. The forms are : 



Phylloceras cf. mediterraneuon Neurn. 

 Phylloceras cf. suhptychoicum Dacque. 

 Phylloceras manfredi (Oppel). 

 Phylloceras cf. saxonicum Neumayr. 

 Phylloceras cf. isotypum Benecke. 

 Sowerhyceras protortisulcatum (Pom- 



peckj). 

 Sowerhyceras cf. loryi (Mun.-Chalmas). 

 Lytoceras cf. gastaldii G-ernmellaro. 

 Lytoceras aff. polycyclum Neumayr. 

 Ochefoceras arolicum (Oppel). 

 Ochetoceras canaliculatum (Miinst.). 

 Ochefoceras sp. 



Taramelliceras cf. ana.r (Oppel). 

 ' Lissoceras' erato (cl'Orb.). 

 Perisphinctes (Grossouvria) cf. regal- 



micensis Gemm. 

 Perisphinctes (Grossouvria) cf. 



navillei Favre. 

 Perisphinctes (Grossouvria) cf. densi- 



eosta Geinm. 

 Perisphinctes (Biplices) Jcobelti Neum. 



Perisphinctes (Ataxioceras) <eneas 



Gemm. 

 Perisphinctes {Ataxioceras) cf. 



michalsldi Buk. 

 Perisphinctes (Ataxioceras) cf. depereti 



de Riaz. 

 Perisphinctes (sensu stricfo) cf. sayni 



de Riaz. 

 Perisphinctes (do.) cf.jelskii Siern. 

 Perisphinctes (do.) plicatilis de Riaz, 



non Sow., nee Siem. 

 Perisphinctes (do.) cf. convolutus 



(Quensfc.). 

 Perisphinctes (do.) sp. nov. aff. tricho- 



plocus Gemm. 

 Pelfoceras foucasianvm (d'Orb.). 

 Peltoceras cf. toucasianum (d'Orb.). 

 Peltoceras pervinquieri, nom. nov.. 



mihi=/ miquei Pervinq. non Kil. 

 Peltoceras aff. fouquei Kil. 

 Aspidoceras cf. mgir (Opp.). 



There is perfect similarity of matrix in all the specimens : the 

 outcrop consists of a truly Alpine, ammonitic ' Knollenkalk,' which 

 contains apparently no other organisms ; but the list includes 

 forms from the transversarium zone mixed with some from the 

 acanthieiis beds. If we call to mind the curious fact that, not only 

 in the Southern Alps, but also in Sicily there is a great development 

 of the Argovian to the exclusion of the higher beds of the Corallian, 

 followed without any apparent break by the acanthicus beds, it 

 appears quite probable that the two ' zones ' occur here in a similar 

 manner, and that the apparent mixture is not due to doubtful 

 identifications. 



Most of the forms enumerated above are of undoubted Argovian 

 age. With regard to the remainder, a brief discussion of their 

 stratigraphical value may be desirable. 



Peltoceras fouquei Pervinq. non Kil. seems to be the only form 

 that had previously been recorded from this locality or its vicinity. 

 The matrix also is a red limestone, and Aubert collected it ' pres 

 de la zaouia de Sidi Bou Goubrine.' Pervinquiere originally gave 

 the age of the ammonite as Sequanian, 2 but in 1907 he figured 

 it as a Lower Tithonian form. The latter age seemed to him 

 ' more probable, especially as nothing else indicates the occurrence 



Noues Jahrb. vol. ii (1893). 



' Etude Geologique de la Tunisie Centrale ' 1903, p. 2£ 



