PLATE XLVIII. 



Fig. I. — Coscinoditeub drf&rmatiu Mann. Enlarged &50 diameters. Description, p. 



l'i'.. 2. — Ooscinodiscus dtformalut Mann. Enlarged 550 diameters. Description, p. 



Mann Enlarged 375 diameters. Description, p. 257. 



—Coscinodiscus robtuttu Grev. varietj vrithopen girdle). Enlarged 875 diameters. I 

 tion, | 



