PLATE 41. 



Pag* 

 Figs. 1 -19. Spibifkra disjuncta 243 



(Tlio references to this plate on page 246, should bo to plate 42.) 



1-3. Views of small iiidividitals with short or rounded extremities. 



4. Am individual with the cardinal extremities much extended. 



S - !•. Specimens showing some variations in the extent of the cardinal line, but all possessinjc 



a simple mesial fold. 

 10- 16. Specinjeus .showing variations in the form of the valves having a double mesial fold. 



17. Cast of an individual preserving both valves, with cardinal extremities extended, the 



mesial fold Iteing narrow and angular. 



18. Profile view of specimen, fig. 1", showing the gibbosity of the valves. 



19. An individual with extended cardinal extremities, and a broad rounded mesial fold. 



(The figures on this plate are all dorsal views.) 



