PLATE 11. 



Pnge 

 Fig. 1-0. OrTHIS TUBtJLOSTRIATA. 16(5 



1-3. Vouiig individuals of this species. 



4 Sc 6. Larger individuals. The two figures on each side of the central figure 6 are enlarge- 

 ments of stria;; one without the tubular openings, the other showing this character. The 

 righthand figure of the line shows the cardinal and brachial processes of the dorsal valve, 

 and the lefthand figure is the profile of fig. 0. 



Fijr. 7 - 14. Ortiiis eminens. 1(57 



7 - 10. Young iuilividuals. 

 12. Three views of a specimen of medium size. 

 1;!. Three views of a larger individual. 



Tiic specimens 12 and 1." are well-marked and characteristic forms of this species. 

 11 & 11 .ire referred with d<mbt to this species. 



