November, 1913. 



KNOWLEDGE. 



432 



Figure 508. Anlacodiscus kittonii, eight rays 

 Objective used; Zeiss's B.B. of 0-30 N.A. ; 

 X 375. 



Figure 509. Anlacodiscus sp.?, a reproduction 



of Figure 411. Volume XXXV, page 372; 



X 1,900. 



FIGURE 510. Anlacodiscus sp.?, from 

 which Figure 509 was taUen. Objective 

 used; Zeiss'sB.B. of 0-50 N.A.; X 375. 



Figure 511. Anlacodiscus kittonii, 



from the west coast of Africa. Part of 



a group of four- and five-rayed forms. 



Figure 512. Anlacodiscus kittonii, 



four-rayed form. Magnification ;md 



objective the same as in Figure 510. 



Figure 513. Anlacodiscus kittonii, centre of the 



valve, shewn in Figure 508 ; X 1900, the same lens used 



as in Figure 514. 



Figure 514. Anlacodiscus kittonii, centre of the 



valve, shewn in Figure 512. Objective used; Swift and 



Son's oil immersion of 1-30 N.A. ; X 1,900. 



