INDEX TO VOLS. I-V. 



Roman numerals indicate the volumes ; page numbers in black 

 type refer to descriptions or diagnoses. 



abbreviation, < Y>smarium, III 84 



- t. minor, III 85 



- var. planctonicum, III 85 

 abbreviata, Ursinella, 1 1 1 84 



a l. >ons>. Kuastrum, II 23 

 n<i.s, Helierella, Jl 2:J 

 abnipta, Ursinella, III MI 

 abniptum, CKsterium, I 158 

 var. bivvin>. I 160 



- var. cambricuin, I 1GO 



- f. punctata, 1 159 



- Cosmarium. 1 1 1 80 

 acanthophorum, Staui-astnnn, V 28 

 acarides, Staurastrum, I 14 ; \' 73 



var. eboracciivjs, V 74 

 acerosa, Arthrodia, I 147 



Baeillaria, I 140 

 ;'<<! i-uDi, Cln.sterium, I 146 



- var. acerosum, I 148 



- var. angolense, I 149 



var. angustum, I 148 

 var. elongatum, 1 148 



var. lanceolatum, I 149 



- var. ma jus, I 147 



- var. medium, I 148 



- var. minus, I 148 



var. truncatuni, I 147 



- var. typk-um, I 147 

 acerosus, Vibrio, I 146 

 aciculare, Closterium, I 174 



var. subpronum, I 175 

 acicularis, Arthrodia, I 174 

 aciculiferum, Staurastrum, V 171, ISO 

 Actinocystis, II 77 

 aculeata, Binatella, IV 77 



- Goniocystis(Trigonocystis), V 101 

 Heterocarpella, IV 79 



aculeatum, Desmidium, V 160 



Didymidiurn (Staurastrum), V 



1(51 

 Didymidium (Xanthidium), IV 



79~ 

 Holocanthum, IV 79 



aculeatum, Phycastrum, V 161 



- (Stenactinium), V 161 



- Staurastrum, V 1.15), 160, 162, 



163 



- var. bifidum, V 187 



- var. rontrovrrsuin, V 162 



- subsp. cosmospinosum, V 164 

 var. Ehrenbergii, V 161 



var. ornatum f. simplex, V 

 Us 

 Xanthidium, IV 78 



var. basidentatum, IV 80 



- Zygoxanthium, I \" T'.i 

 acuminata, Arthrodia, I 130 

 acuminatum, Cl^-tt-rium, I 130 

 Acus, Closterium. I 188 

 acuta, Arthrodia, 1 177 



K'-hinella, I 177 

 Frustulia, 1 177 



- Sjiirotienia, I 46 



- Stauroceras, I 177 

 acutum, Closterium, I 177 



var. 3, I 179 



- var. Linea, I 178 



- Staurastrum, IV 109 

 adelochondrum, Cosmarium, V 267 



Dysphinctium, V 267 

 Penium, 193; V 281, 267 



adoxum, Cosmarium, III 78 



affine, Euastrum, II 17 



- f. scrobiculata, II 18 ; V 265 



- Staurastrum, V 128 

 affinis, Helierella, II 17 

 alatum, Cosmarium, III 256 



- var. ajquatoriense, III 257 

 alpestre. Cosmarium, III 24 

 alpina, Ursinella, II 149 

 alpinum, Cosmarium, II 149 



var. Garrolense, III 12 



var. Helveticum, III 12 



Xanthidium, IV 116 



alternans, Staurastrum, IV 170 

 var. coronatum, IV 172, 184 



