
Plate LX. 
All the figures on this plate are magnified eighteen diameters. 
igs a1 and 2. Hurychilina: subfadiata, mi sp 379. ee 126 
Ia, 16 and tc, left valve, from Lebanon, Tenn., with profiles 
between points marked on margin of fig. Ia; 2a, 26 and 2c, 
right valve, from Dixon, IIl.,, with similar profiles. 
Figs, 3 and 4. Eurychilina longula, n. sp.) 2. eee 127 
3a, large left valve, showing the interior, with the concave marginal 
area and ‘‘frill’’; 34, vertical profile of same; 4, right valve, 
showing the external features of the species. Both specimens 
are from the Birdseye hmestone, at High Bridge, Ky. 
Higsass,-6, 7 and 8. Kurychilina equaliss nm: sp. a0) 129: 
5, an example from Lebanon, Tenn., on which the marginal area is 
exceedingly wide; 6a, 64 and 6c, left valve of the usual type, 
from High Bridge, Ky , with vertical and longitudinal profiles ; 
7, very young example, from same locality; 8, an unusually 
elongate right valve, from the same locality as 6 and 7. 
Figs.g, 10, 11 and 12. Hurychilina pranosa, 0: sp 99 eee 
ga, 94 and ge, average left valve, with vertical and longitudinal 
profiles; 10, young left valve, with a spinous fringe ; 11, elongate 
variety, right valve, having larger tubercle, and the marginal 
area covered with interrupted concentric striz ; 12, interior of a 
left valve. 
Fig. 13. Eurychilina obesa, n. sp..... aS er anata 129 
Left valve, showing the faint sulcus, granulose surface, and grano- 
radiate margin. Birdseye limestone, High Bridge, Ky. 
Fig. 14. Eurychilina striatomarginata, (S. A. Miller)....... 130 
Left valve, from Southern Indiana, with the sulcus not reaching the 
dorsal edge. In some examples it seems to do so. 
