EXPLANATION OF PLATE XXVI. 



Fig. 1.— Lateral view of lorica of Tintinnvs serratus, X615. 

 Fig. 2.— Lateral view of lorica of Tintinnopsis reflexa, X600. 

 Fig. 3. — Lateral view of lorica of Tintinnopsis dadat/i, X375. 



Individual with primary oral rim only. 

 Pig. 4. — The same of a second lorica, showing both primary and secondary 



oral rims, X190. 

 Fig. .">. — The same of a third lorica, in which the secondary oral rim is only 



partially developed, X375. 

 Fig. 6.— Lateral view of lorica of Cyttarocylis fasciata, X490. 

 Fig. 7. —Longitudinal optical section through wall of lorica of C. fasciata, 



X1225. 



ABBREVIATIONS. 



lib. op.— aboral aperture. 



f. — fundus. 



o. op.— oral aperture. 



o. r. — oral rim. 



p. o. r. — primary oral rim. 



pr. el. — prismatic elements. 

 i. :n. — reflexed margin. 

 s. o. r.— secondary oral rim. 

 sp. 6. — spiral baDd. 



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