SPECIES OF CAMERINIDAE — BARKER 



323 



ures and description of that species, and although it occurs at a 

 lower horizon in Mexico (Claiborne) than in Curasao (Jackson) it 

 is considered to be at most only a minor variant of Rutten and 

 Vermunt's species. As the stratigraphy of the various West Indian 

 islands is in a somewhat chaotic state, there may perhaps be an 

 error in the horizon ascribed to N. vanderstoki in Curasao. 



Description of the Mexican specimens is as follows : Test small to 

 medium in size, flattened lenticular, completely involute, sutures 

 rather obscure owing to state of preservation, radiate, may be slightly 

 raised (due to weathering?), with a tendency to form beads of clear 

 shell material in the umbonal region. Diameter, up to 4.5 mm, average 

 3.5 mm; average thickness, 1.2 mm (1.1 to 1.3 mm for 7 specimens). 



Sections show 4% to 51/2 whorls, with 27 to 30 chambers in the 

 final whorl. The septa are regular, nearly straight for a little more 

 than half their length, then evenly recurved toward the periphery. 

 The chambers are rather longer in proportion to their width than 

 in the smaller, somewhat similar species, Cainerina guayahalensis. 

 Below are given figures for comparison of material from Mexico 

 with the type from Curagao : 



Phsiotypes.—V.S.^M. nos. 497880, 497881, and 497882. 

 Otlcer specimens.— U.S.^M. nos. 497883 and 497884. 



CAMERINA MOODYBRANCHENSIS Gravell and Hanna 



Plate 13, Figxxre 5 ; Plate 20, Figube 2 ; Plate 22, Figure 2 



1935. Camerma moodyhranchensis Gr^vvell and Hajnna, Journ. Pal., vol. 9, p. 

 332 ; pi. 29, figs. 15, 22-24. 



This species has been well described and figured already by Gravell 

 and Hanna, so only a few notes will be given on Mexican specimens 

 ascribed to this species. 



Test small to medium in size, compressed lenticular, completely in- 

 volute. The septa are not raised and show as nearly straight radiat- 

 ing lines of clear shell material. Diameter, average 2.5 mm; thick- 

 ness, 0.7 to 0.8 mm. 



Sections show a rather tightly coiled test of 4 to 5 whorls with 

 25 to 30 chambers in the final whorl. The septa are gently curved 

 and only very slightly oblique. A comparison of the dimensions and 



