— 117 — 

 Tripelgestein yon Mejillones, Bolivia. 



1. 



1 



Coscinodiscus Oculus Iridis Ehr. var. 



2 



Actinocyclus 



alienus Grün. 



3 



Coscinodiscus 



debilis Grove. 



4 Stictodiscus Kittonianus Grev. 



5 



Coscinodiscus 



concavus Greg. 



6 



= 



lacustris Grün. var. 



7-8 



? 



excentricus Ehr. et var. 



9 



s 



lacustris Grün. var. 



10 



* 



radiosus Grün. 



11 



* 



excentricus Ehr. 



12 



5 



micans A. Seh in. 



13 



i 



subtilis Ehr. 



14 



* 



micans A. Schm. 



15 



Actinocyclus 



Ralfsii Sm. 



! — 22 Coscinodiscus 



concavus Greg. 



23 



Stephanopyxi; 



3 Grunowii Gr. et St. 



2. 1 — 4 Aulacodiscus margaritacens Ralfs. 



5 = Comberi Arn. 



6 — 7 * convexus Gr. et St. 



8 = formosus Arn. 



3. 1 Aulacodiscus Kittonianus Grev. 



2 Melosira sulcata Kg. 



3 = radiata Bright. 



4 Actinocyclus Ehrenbergii Ralfs. 



5 Coscinodiscus symbolophorus Grün. 



6 Endyctia oceanica Ehr. 



7 Coscinodiscus Asteromphalus Ehr. var. macrantha 



Grün. 



8 Euodia gibba Bail. 



9 Coscinodiscus elongatus Grün. 



10 Asteromphalus Shadboltianus Grev. 



11 — 12 Actinoptychus undulatus Ehr. 



*13 Actinoptychus 

 14 — 16 = Boliviensis Jan. 



4. 1 Actinoptychus Halionyx Grün. 

 2—3 Cocconeis deeipiens Cl. var. 



4 — 5 Grammatophora maxima Grün. 



6 s flexuosa Grün. 



7 * Adriatica Grün. 



