330 M. F. J. Pictet on the present state of the question as to 



We shall not refer here to the lower deposits, which have no- 

 thing to do with our subject, namely the beds with Ammonites 

 opalinus, those with A. Murchisona, and the Crinoidal limestone. 

 Those which interest us are : — 



1. The lower Tithonian fauna, which may be subdivided into 

 two: — 



A. The fauna of the Czorsztyn limestone, from which M. Neu- 

 mayr cites twenty-five species. Of these, twelve also occur in the 

 blue marble of the Apennines. The general fauna especially 

 approaches the Jurassic fauna known under the names of the 

 fauna of Ammonites acanthicus and A. tenuilobatus. Some spe- 

 cies are the same as those of Stramberg (A. silesiacus, Kochi, 

 ptychoricus, &c). Only one persists into the true Neocomian 



(A. quadrisulcatus) . The perforated Terebratulcs are T. Catulloi, 

 Pict., and T. sima, Zeuschn. 



B. The true Tithonian fauna, containing thirty-eight species 

 of Cephalopoda, of which sixteen reappear in the breccia of Ro- 

 goznik, seventeen in the blue marble of the Apennines, and only 

 eight at Stramberg. Terebratula Catulloi and T. sima persist. 



2. A white limestone which has been found only at two points 

 in the south-west, and which corresponds to the true Stramberg 

 limestone. Of fourteen determinable Ammonites, twelve also 

 occur in the latter deposit; of these seven are common to Stram- 

 berg and Rogoznik, and only one is peculiar to the latter stage. 



We must add to these memoirs a very interesting investiga- 

 tion of the fauna of Terebratula janitor made in the environs of 

 Palermo by M. G. G. Gemellaro*. According to his researches, 

 the grey limestone of Monte Pellegrino contains, together with 

 several Ammonites characteristic of Stramberg, an abundant 

 fauna of Gasteropoda, among which are several of the Nerincece 

 of Inwald, and also Terebratula janitor associated with T. mora- 

 vica ! Before taking all the advantage of these facts that we may 

 hope from them, we must, however, wait for the author's final 

 conclusions. It is not impossible, from some statements, that 

 he also may recognize two distinct stages in this deposit. 



Such are the principal facts with which we are at present ac- 

 quainted, and upon which we can found our judgment. I may be 

 permitted to point out that the question has become singularly 

 modified, and that I was not wrong when I called upon palaeonto- 

 logists not to overstep the proofs furnished by the facts, and to 

 postpone a definitive solution. I am still of the same opinion, 

 although the reasons for waiting have become less forcible, and 

 we are now much nearer the solution. 



* Studii paleont. sulla fauna del Calcareo a Tereb. janitor del norde di 

 Sicilia. 4to. Palermo, 1868 et seqq. 



