PLATE LXXX. 



Figures magnified 500 diameters. 



AITLISCUS JOHXSONII, A. S., Srhm. At., 07, f. 2. Crescent City. 

 Cal. 



2. SPEOIOSUS, A. S., Schm. At., 10S, f. 3. Santa Monica. 



3. BiDPUbPHiA, var. Kitton ; Srhm. At., s<), f. >2. Santa 



Monica. 



4. BIDDULPHIA, Kitton; Srhm. At., 67, f. 3. 



5. INTKSTINALIS, A. S.. Srhm. Al., 108, f. 2. Santa 



Monica. 



6. TEXTILIS, A. S., Schm. At., 89. f. 9. 



7. CARIBAKT-S. ( 'Irve.; Srhm. At., 67, f. 9, 10. 



8. INCERTUS, Schm. At., 89, f. 19. Santa Monica. 



!. AMKRICANUS, Ehrl). Mik., 33, f. 14, 2. Norwich, Conn. 



Probably a var. of A. srulptus. 



10. AULACODISCUS ROGERSII, (Eupodisi'iis) Elirb. Ber., 1S44, p. 81; 



Srhm. At., 92. f. 2-6; 107, f. 3. Maryland. 



11. ARKUS ( Kupodiscus), Pensacola ; Schm. At., 4. 



12. PROBABILIS, Schm. At,, 36, f. 15, ( 13-16 ); 103, f. 3, 



4. Rather exceptional rignre. The normal 

 form shows blank space from center to pro- 

 cesses. 



