part 3] THEorGH the axdes of peeu and bolitia. 255 



In the absence of anj proved break, Prof. Lisson accounts for 

 this fact by assuming that the axis of the anticline turns in a 

 south-easterly direction when traced southwards across the Kiniac. 

 That author further recognizes two distinct faunas : an upper 

 (Valanginian) represented by the deposits of San Lorenzo-Morrc 

 Solar, and a lower represented b}^ those of Puente Inga and Cerro 

 Palao, the last-named being overlain on the east by the beds of 

 Piiionate, a locality close to Lima, containing a Wealden flora. This 

 lower fauna he regards as being of Portlandian age,i a conclusion 

 to which he appears to have been led by reasoning mainly on 

 stratigraphical grounds ; for, in an earlier publication, he definitely 

 assigns the beds of Puente Inga to the Lower Cretaceous. ^ 



This, however, is not a matter of great importance, if we make 

 comparison with other known deposits of transitional character 

 such as that described b}^ C. Burckhardt from Mexico, ^ but the 

 following anah^sis ^ of a list of forms cited as coming from Puente 

 Inga, many of which are represented in my own collection from 

 this locality, tends to show that even higher horizons than the 

 Valanginian are present, and therefore it is by no means certain 

 that these beds are lower than those of San Lorenzo. 



The Wealden flora of Pinonate and the Caleta del Paraiso cannot, 

 in my opinion, be taken as indicating a definite horizon from which 

 to judge the relative position of the marine deposits, for similar 

 terrestrial conditions may have persisted throughout Lower Cre- 

 taceous times, and the same flora might recur anywhere in the 

 succession. 



HOPLITES (BeUBIASELLA) c/. CALISTO a. d'Orbig-ny^BERKIASELLA CALISTO 



(A. d'Orbigny). 



Specimens in my collection agree closely with the syntypes of A. d'Or- 

 bigny's species preserved in the Natural History Museum of Paris,^ and with 

 others figured by A. Toucas.^ This species, according to W. Kilian,^ cha- 

 racterizes the Upj)er Tithonian or Berriasien Inferieur. 



An allied form, characterized by finer ribbing, appears to be more closely 

 related to Berriasella tenuicostata Burckhardt,** a species found in beds transi- 

 tional between Jurassic and Cretaceous. 



HoPLiTES (Neocomites) limensis Lisson, a form originally figured and 

 described as Cosmoceras limense Lisson.^ 



1 am unable to separate this species from Berriasella calisto (A. d'Orbigny). 



^ ' Edad de los Fosiles Peruanos & Distribucion de sus Depositos en la 

 Republica ' Lima, 1913, pp. 24-25. 



2 ' Geologia de Lima & sus Alrededores ' 1907, p. 64. 



'^ ' Faunes Jurassiques & Cretaciques de San Pedro del Gallo ' Bol. Inst» 

 Geol. Mexico (1912) No. 29. 



■* Based largely on the authority of V. Paquier & W. Kilian, ' Lethaa Geo- 

 gnostica' pt. 2, vol. iii, Kreide I, 1907. 



^ See Palaeontologia Universalis, ser. 3, fasc. iii (1911) pi. ccxxvi. 



^ ' Etude de la Faune des Couches Tithoniques de I'Ardeche ' Bull. Soc, 

 Geol. France, ser. 3, vol. xviii (1890) p. 600 & pi. xvii, fig. 3. 



' ' Lethaea Geognostica' p. 183. 



« Bol. Inst. Geol. Mex. 29 (1912) p. 161 & pi. xxxix, fig. 3. 



9 ' Geologia de Lima, &c.' 1907, p. 56 & pi. x, fig. 1. 



Q. J. G. S. No. 307. IT 



