PLATE XV. 



Page. 

 RHYNCHONELLA CASTANEA 153 



Figs. 1, 1 a. Front and lateral views of a small subcuboidal specimen. 

 4, 4 o. Ventral and lateral view of an adult shell. 



CRYPTONELLA ? CIRCULA 163 



Figs, 2, 2 a, 6. Ventral, lateral, and dorsal views of a rather large specimen, enlarged to 

 two diameters. 



RHYNCHONELLA ? OCCIDENS 152 



Figs. 3. 3 a, Z>. Dorsal, ventral, and lateral views of a typical specimen, enlarged to two 

 diameters. 



PENTAMERUS COMIS 159 



Figs. 5. Ventral view of a specimen, showing obscure plications towards the front. 



5 a, 5 b. Lateral and ventral views of a rotund, smooth example. See plate iii, figs. 4 

 and 7, and plate xiv, figs. 15, 15 a, ft. 



RHYNCHONELLA HORSFORDI 15a 



Fig. 6. Dorsal view of a little smaller example than that shown by fig. 3, plate xiv. 



ANADONTOPSIS AMYGDAKEFORMIS 180 



Fig. 7. Lateral view of the left valve. 



7 a. Cardinal view of the two valves united. 

 7 6. Anterior view of the same. 





 DYSTACTELLA INSULARIS 172 



Fig. 8. Lateral view of the left valve, showing the anterior muscular scar. 



NUCULA RESCUENSIS 172 



Fig. 9. .View of left valve, enlarged to three diameters. 



GONIOPHORA PERANGULATA t 171 



Fig. 10. View of left valve, showing the strongly-marked angular ridge. 



C YPRICARDINIA INDENTA 182 



Fig. 11. Lateral view of left valve, enlarged to two diameters, to show the characteristic 

 surface markings. See plate v, fig. 14. 



PTERINEA FLABELLA 165 



Fig. 12. Example from Lone Mountain. See plate v, fig. 6. 



SANGUINOLITES VENTRICOSUS 177 



Fig. 13. View of left valve of a specimen preserving the characters of the species. 



NYASSA PARVA 173 



Fig. 14. View of right valve, showing the muscular impressions, enlarged to three diam- 

 eters. 

 14 o. Left valve, similarly enlarged. 



GRAMMYSIA MINOR 174 



Figs. 15, 15 a. View of right and left valves, enlarged to two diameters. 



SANGUINOLITES COMBENSIS 175 



Fig. 16. View of right valve. Natural size. 



