476 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



riparium, 327. 



v. implexum, 328. 

 v. polyrhizurn, 328. 

 v. validum, 328. 

 stagnale, 330. 

 stagnorum, 330. 

 tortuosum, 325, 328. 

 f. polyrhizum, 328. 

 Rhodochytrium, 148. 



Spilanthidis, 148. 

 Salicornia, 350. 

 Salmacis, 115. 

 Sarcopbyllis, 148. 

 Scalarifortn conjugation, 102. 

 Scenedesmaceae, 155. 

 Scenedesmus, 168. 

 acutus, 168. 



v. dimorphus, 169. 

 antennatus, 169. 

 v. rectus, 169. 

 bijuga, 168. 



v. alternans, 168. 

 v. flexuosus, 168. 

 bijugatus, 168. 



v, flexuosus, 168. 

 caudatus, 169. 

 denticulatus, 169. 

 dimorphus, 169. 

 hystrix, 169. 

 obliquus, 168. 



v. dimorphus, 169. 

 polymorphus, 169. 

 obtusus, 168. 

 quadricauda, 169. 

 f. abundans, 169. 

 v. ellipticus, 169. 

 f. horridus. 169. 

 f. setosus, 169. 

 f. typicus, 169. 

 rotundatus, 169. 

 Schizochlaniys, 16? . 



gelatinosa, 167. 

 Schizogonium, 187, 218, 222. 

 crenulatum, 218. 

 crispum, 218. 

 laetevirens, 186. 

 murale, 218. 



v. alpinum, 218. 

 Schizomeris, 189. 

 Leibleinii, 189. 

 Schizonema, 148. 

 Sciadium, 94. 

 arbuscttla, 95. 

 gracilipes, 95- 

 Scrobiculala, 103. 

 Scytosiphon, 284. 

 Sedoideae, 411. 



Selenastrum, 171. 

 Bibraianum, 171. 



minutum, 171. 

 Sessiles, 423. 

 Siphonales, 91, 385. 

 Siphonocladiales, 91, 321. 

 Siphonocladus, 362, 371, 374. 

 membranaceus, 362, 371. 



rigidus, 374. 



tropicus, 374. 

 Sirogonium, 119. 



ceylanicum, 119. 



sticticum, 119. 

 Sorastrum, 173. 



bidentatum, 173. 



spinulosum, 173. 

 Spartina, 185, 202. 

 Sphacelaria. 



raceinosa, 147. 

 Sphaerella, 130. 



lacustris, 130. 

 Sphaerocarpus, 123. 



scalaris, 123. 

 Sphaerocystis, 310. 



Schroeteri, 310. 

 Sphaeroplea, 384. 



annulina, 384. 



Braunii, 385. 



crassisepta, 385. 

 Sphaeropleaceae, 384. 

 Sphaerospenmtm, 121. 

 Spirogyra, 105, 200. 



adnata, 119. 



affinis, 113. 



bellis, 115. 



bifaria, 116. 



calospora. 118. 

 f. gracilior, 118. 

 f. major, 118. 



catenaeformis, 108. 



cotnmunis, 108, 109. 



condensata, 109. 

 v. Rusbvi, 110 



crassa, 112. 



decimina, 110. 



v. submarina. 110. 

 v. triplicata, 110. 



diluta, in. 



dubia, 115 



v. longiarticulata, 115. 



elegans, 118. 



elongata, 119. 



flavescens, 113. 



fluviatilis, 114. 



fusco-alra, 109. 



gracilis, 114. 



Grevillt-ana. 117. 



