PLATE 13 



Fig. 21. Diagram of plates of hypotheca of Gonyaulu.c diegensia sp. 

 nov. in antapical view. X 500. 



Fig. 22. Surface view of apical closing platelet of same. X lUOO. 



Fig. 23. Diagram of plates of epitheca of same in apical view. X 500. 



Fig. 24. Ventral view of theca of rugose specimen with wide inter- 

 calary bands. Figures 21-24 all from specimens taken June 21, 1904, on 

 the "New Cod Ground," off San Diego, California. 



Fig. 25. A precingular plate of Gonyaulax (Steiniella) fragilis 

 (Schiitt) showing surface markings. Note nodal pores and partial sub- 

 mergence of linear markings. San Pedro Harbor, California, May 31, 

 1901. X 1000. 



Fig. 26. Antero-dorsal view of theca of Gonyaulax scripp.sae sp. nov. 

 Channel, San Pedro Harbor, California, May 29, 1901. X 1000. 



Fig. 27. Ventral view of theca of same. X lUOO. 



ABBREVIATIONS 



l'—4' — apical series of plates. d. pi. — closing platelet of apex. 



l"-6" — precingular series. //. po. — flagellar pore. 



l"'-6"' — postcingular series. int. pi. — intermediate plates of ven- 

 IP — posterior intercalary plate. tral area. 



1"" — antapical plate. post. pi. — posterior plate of same. 



ant, pi. — anterior plate of ventral v. po. — ventral pore. 

 area. 



Figures 21-25 drawn by Mrs. .losephine Rigden Michener; figures 26, 

 27 by Mr. R. W. Harvey. 



[278] 



