316 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 



has recently been made the genotype of a new genus, Paraspiro- 

 dypeus., by Hanzawa (1937, pp. 116-117). In 0. jennyi, however, 

 the subdivision is much less plainly marked, the species being con- 

 sidered intermediate between OpercuUnoides and Para-spiroclypeud, 

 thus substantiating Hanzawa's theory of the relationship between 

 the two genera. 



A further point that may perhaps have some bearing on this is the 

 presence of well-marked multiple apertures (seen in median sections) 

 in 0. jennyi. These have been figured by Carpenter as "secondary 

 pores" (see also under 0. prenummulitlformis) and may have led 

 later to subdivision of the chambers into chamberlets as seen in 

 Spiroclypeus and Heterostegina. 



Ootypes.—V.^.'^M. nos. 497855-497858. 



Occurrence. — Fairly common in the Guayabal (Tempoal of ver 

 Wiebe and Muir), Claiborne Eocene. Cotypes selected from an out- 

 crop 11 kilometers southeast of Sabaneta, Veracruz; collection of 

 Dr. H. Jenny no. 1573. 



This species is named in memory of the late Dr. Hans Jenny, who 

 spent many years carrying out pioneer work in Mexican stratigraphy 

 and collected the types of this and numerous other new species of 

 larger Foraminifera. 



OPERCULINOIDES OCALANUS (Cushman) 



Plate 12, Figure 5; Plate 15, Figure 5 



1921. Operculina ocalana Cushman, U. S. Geol. Surv. Prof. Paper 12S-E, p. 129. 



pi. 19, figs. 4, 5. 

 1935. Operculina ocalana Cushman, referred to new genus OpercuUnoides by 



S. Hanzawa, Sei. Rep. Tohoku Imp. Univ., ser. 2 (Geol.), vol. 18, no. 1, p. 18. 

 1937. Operculina ocalana Cushman, Vaughan in Sheppard's "Tbe Geology of 



South-Western Ecuador," pp. 158-159, figs. 113, 114. 



Cushman's original description of O. ocalanus reads as follows: 



Test complanate, much compressed, composed of two to three coils, the 

 last with 16 to 18 chambers; sutures raised, confluent in the center, some- 

 what rounded, the area between concave and smooth ; chambers three to four 

 times as long as wide ; central area of the test umbonate ; periphery somewhat 

 raised by a thickening in which the raised sutures terminate. Length as much 

 as 6 millimeters. 



Geologic occurrence, Ocala limestone and Jackson formation. 



Specimens from Ecuador are considered by Vaughan to differ in 

 no essential particulars but are generally of smaller size. Speci- 

 mens from Mexico agree well with the general description of Cush- 

 man and the later figures of Vaughan but, like the Ecuadorian 

 specimens, are consistently smaller than the types. The following 

 is a brief description: 



