216 ONYCHOCELLA. 



Onychocella piriformis (Goldf.) 1 is another ally, but has a lower 

 zooecial aperture, while the avicularian aperture is larger and the 

 front wall occurs only above and not on both sides of this. 

 0. santonensis (D'Orb.) 2 has a smaller mouth and longer avicu- 

 laria ; 0. solea (Novak) 3 a semi-elliptical aperture with a mucronate 

 lower margin. 



SPECIMENS. 



D. 181. Frond. Bathonian. Eanville. Tesson Coll. Figd. No. 22. 



D. 480. Fragment mounted on slide. Bathonian. Ranville. Tesson Coll. 



1 Eschara piriformis, Goldfuss, op. cit. p. 24, pi. viii. fig. 10 ; Hagenow, 

 op. cit. p. 75, pi. ix. fig. 6 ; pi. xi. fig. 6. 



2 Eschara santonensis, D'Orbigny. Op. cit. p. 109, pi. Dciii. figs. 1-3 ; 

 pi. Dclxxiii. fig. 4. 



3 Biflustra solea> Novak. Op. cit. pp. 94-5, pi. iii. figs. 12-16. 



