PLATE LXVII. 



Figures magnified 500 diameters. 



Fig. 1. BACTERIASTRUM FURCATUM, Shad.; T. M. ,S., 1854, p. 14, 1, f. 



1, Frit., 863, 6, f. 26. 



Figs. 2, 3, 4. " VARIANS, Lander, T. M. S., 1864, p. 8,3, f. 1-6; 



Sin. Sp. T., No. 57, == B. curvatnm and 

 furcatum. 



Fig. 5. PERIPTERA CHLAMYDOPHORA, Ehrb. Mik., 33, 18, f. 96 ; Prit., 



865, 8, f. 25. A nonentity, evidently only a 

 fragment of Dicladia or the like. 

 " 6. STEPHANOGONIA ACTINOPTYCHUS, Ehrb.; V. H.,83, ter. f. 2-4. 



(Mastogonia). 

 " 7. STEPHANOPYXIS LIMBATA, Ehrb., 18, f . 7 ; V. H., 83, ter. f. 13, 



14. (Pyxidicula limbata?). 



" 8. STEPHANOGONIA POLYGONA, Ehrb. Mik., 33, 18, f. 10; Sill. J., 



April, 1845, p. 326, 4, f, 13; M. D., 43, f. 30. 

 Figs. 0, 10. STEPHANOPYXIS CAMPEACHIANA, Grun. ; Schm. At., 65, f. 19, 



20. 

 " 11, 12. STEPHANOGONIA (Cladogramma) CALIFORNICUM, Grun., 83, 



bis f. 18, 1!). 



" 13, 14. TROCHOSIRA SPINOSA, Kitton; V. H. 83, bis f. 14, 15, 17. Not- 

 tingham, Md. 



" 15, 16. STEPHANOGONIA POLYGONA, Ehrb. Mik., 33, 18, f. 10; Sill. J., 



April, 1845, p. 326, 4, f. 13; M. J., 1860, p. 

 68, 5, f. 8. 



17-19. PERIPTERA TETRACLADIA, Ehrb. Mik., 33, 18; f, 9. A genus 



of doubtful genuineness. Still no harm 

 in retaining it as does V. H. V. H., 83, 

 ter. f. 7-9; Prit., p. 865, 6, f. 30. 

 Fig. 20. STEPHANOPYXIS CORONA, Grun.? V. H., 83. ter. f. 10, 11, - 



Systephanea corona. 



" 21. (Creswellia) RUDIS. Grev.; T. M. S., 1866, PL 



8, f. 7. Monterey, Cal. 



