PLATE XV— Continued. 

 Pleurotomabia axion. Hall. 



Page 394. 

 Fig. 17. View of a specimen of this species taken from a gutta-percha cast. 



HOLQPEA GUELPSENSIS, BiLLINGS. 

 Page 391. 



Fig. 18. View of a cast which has been referred to this species. 



MURCHISONIA CONEADI, HaLL. 

 Page 396. 



Fig. 19. View of a specimen of this species taken from a gutta-percha cast. 



MURCSISONIA laphami, Hall. 

 Page 396. 



Fig. 20. The figure is from an impression taken in the natural mould, and shows the characters 

 of the surface and form of the aperture. 



Steaparollus mops [IS, Hall. 



Page 390. 

 Figs. 21, 22. Upper and lower sides of a specimen of this species. 



Teemanotus alpheds. Hall. 



Page 399. 



Fig. 23. Lateral view of a specimen, showing the umbilicus. 

 " 24. Dorsal view, showing the filUng of the dorsal perforations, and the radiating striae near 

 the aperture. 



