]?»LA.TE VIII. 



Page. 

 Fig. 1. Spirifekina pulchra 85 



1. Dorsal view of the original typical specimen, 

 la.' Ventral view of same. 



16. An outline profile of same. 



1 c. Au internal cast of the ventral valve, showing the slit left by the rostral septum. 



1 d. A dorsal view of another very gibbous specimen. 



1 e. Au outline profile of same. 



Fig. 2. Productus Nevadhnsis 64 



2. Ventral view of a specimen, with the ears broken away. 



2 a. Cast of the exterior of a ventral valve of same species. 



2 6. Ventral aspect of another specimen, turned so as to give a more direct view than 



tig. 2. 

 2 c. Internal cast of ventral valve. 



2 rf. A side view of same. 



2e. A longitudinal section of a specimen with the valves united. 



Fig. 3. PHODUCTUS MULTISTRIATUS 76 



3. Ventral view of a rather large specimen, with the free margins broken away. 



3 a. Side view of same. 



3 6. Ventral view of a smaller specimen, with one ear and much of the margins broken 



away. 

 3 c. Dorsal view of last. 

 3d. Side view of same. 



3 e. Internal view of a dorsal valve, too much worn to show internal markings, but 



showing the very abrupt geniculation of the anterior and lateral margins around 

 the flattened visceral region. 



Fig. 4. Productus longispinus 78 



4. A side view. 



4 a. Ventral view, with ears partly broken away. 



Fig. 5. Spiriferina (undt. sp.) 84 



5. Dorsal view of a specimen, with lateral extremities imperfect. 



5 a. Antero-ventral aspect of same. 

 5 6. A side view of same. 



Fig. 6. Athyris subtilita 83 



6. Dorsal view. 



Ca. An outline i)rofilo of same. 



