SPECIES OF CAMERINIDAE BARKER 309 



I am not wholly in agreement with this statement, since vertical 

 canals are seen in transverse sections of Cmnerina figured by Hofker 

 (1927, p. 58) and of Heterostegina (1927, pi. 35). Carpenter 

 (1862) mentions the presence of canals in the pillars in Camerina^ 

 and Mobius (1880, pi. 13) has figured similar canals in Heterostegina. 

 In addition I have obtained Canada-balsam preparations of Camerina 

 vaiiolaria (Lamarck) that show excellently developed vertical 

 canals in the bosses of clear shell material in the umbonal area ; Heter- 

 ostegina also shows vertical canals, and in some sections the aper- 

 ture is clearly seen to be multiple, along the base of the septa, as 

 described for PeUatisinvella. The vertical canals are, admittedly, 

 never so well developed in typical Pellatispiridae, but the differences 

 do not seem to me to justify the formation of a new family. The 

 various members of the Camerinidae show wide variation in the 

 form of the canal system, in some cases as great as that shown by 

 PeTlatispireTla from typical Camerina^ and for these reasons it is 

 proposed that the Pellatispiridae be allowed to remain in the Cam- 

 erinidae, as a subfamily. The new species Camerina 'pellatispiroides 

 is looked upon as linking the Pellatispiridae with the Camerinidae, 

 since its canal system is closer to the former than to the latter, 

 though the aperture is typical of Camerina and there is no sign 

 of the double nature of the walls described for Pellatispirella. 



DESCRIPTION OF SPECIES 



Family CAMERINIDAE Meek and Hayden, 1865 



Genus OPERCULINOIDES Hanzawa, 1935 



OPERCULINOIDES WILLCOXII (Heilprin) 



Plate 13, Figueb 3 ; Plate 16, Figxjeb 1 ; Plate 21, Ftqure 13 



18S2. Nummulites willcoxU Heilprin, Proc. Nat. Acad. Sci. Philadelphia, vol. 



34, p. 191, figs. 1, 2 ; iUd'., vol. 36, pp. 321-322, figs. 1, 2, 1884. 

 1921. Operciilina willcoxii (Heilprin) Cushman, U. S. Geol. Surv. Prof. Paper 



128-E, p. 129, pi. 20, figs. 9-11. 

 1928. Operculinella willcoxii (Heilprin) Vauqhan, 19th Ann. Rep. Florida State 



Geol. Surv., p. 158. 

 1935. Operculinmdes willcoxii (Heilprin) Hanzawa, Sci. Rep. Tohoku Imp. 



Univ., ser. 2 (Geol.), vol. 18, no. 1, p. 18. 



This species has recently been made the genotype of the new genus 

 Operculinoides (see Hanzawa above). The Mexican specimens have 

 been compared with specimens from the Gulf coast of the United 

 States and seem essentially the same species. Their description is as 

 follows : 



Test large, very compressed, completely involute, the last whorl 

 showing rather clearly on the exterior (after the fashion of Assilina). 

 Sutures not clearly visible on the exterior. Diameter, average 5.3 mm, 



