'l'Iiis itiiiiiilc s|iccics is (wisliil iulu l w u i ririi|ilrli- liriiis iif'ii s|)iiiil, w liiili ;irr sn clfjKi; 

 loi^cllici' llitil. (lie i^c'iicr'iil :is|)C(l (jI llic ci-ll is i in?-lil>c, 1 Iji- iirlii;il rsln-rnilirs riC lin- icll 

 lire IxMil. iiwuy IVorii lin; plnMi' cil' lin- sjiii'al m n|i|Hisili' ilircciimis. 



A. j]f(/l/()fi shi>{l\i\ lie i(iMi|i;iiC(l willi I. ((inrniiitiis lioiuiA (<!i)nsilll <j. S. W'csl i(l 

 Ami. Soiilli AfVicaii iMiisciiin, l\, 11)1 ', I. I, li:.;. .')-i.')), rmiii wliirli il is (lislifif^iiislicrl 

 l)y ils stiiiillcr- si/.c, ils ichilivclv iiiii tmw cr ci'lls. ils Iwu s|iii;il liiriis, iirid llir |ic(-uliarly 

 (■()rii|i;ii'l \v;iy in wliiili llic s|)ii;il is (wisicd. 



111. Reinsclîiella obesa VV. iiikI ( I. S. Wisi iu ItijUin Tiilsskrili, .\.\l\, ii)mi,|i. km», 

 l. /|, r. W.\, f)/,. 



('.liroilialO|ili(>ra siii;;iila, |iai'irlali, Irxiii'i' lnliala, sine |iu'i'ii(iiili'. 



Loiljy'. celi. c. S|)iii. '.V.\-'.\-j ;/. ; lai. icll. i .î- i '| i/. 



<liin{linaniarca : ii" i/|. 



Iii tlie spccimciis oljsiMvcd llii' (•lil(ir.i|)lasls wcn- wcll |)rcsri\c(l. l'^acli ccll possessffJ 

 one parielal chloroplasl c)(-cu|niii;; iiiosi dllli.' sidc walls i\cc|)l al llic pôles. Ils iriHrt,'ifis 

 were soiiiewhat lohed and pyreiioids wcir ahscni. Tlic s|icci('s was first olisi-rved fidiii 

 tlie islaiid of Koii ('.liaii^j- in llie GiiH' of Siani. 



Tliere is no doulil tliat llic ort;aiiism dcscrilicd as tirliiscliirlld siitmisnsi.s W. :ind 

 G. S. West., /. c. p. 99, t. l\, f. f)?, |IVi)in ilic saine l(pcalil\ in ihe Easi] is un cncvsled 

 stale of one of tlie Peridiniefe. 



112. Scenedesmus bijugatus (Trnp. ) Kiixz. — Anlimpiia : n"* 1, -a and 10. 



1 13. Scenedesmus obliquus (Ti'iu>. ) Kûtz. — .\nlioipiia : n"' i, 2, 3, (J and 8. 

 ir/j. Scenedesmus denticulatus L.vgehh. var. linearis Hansg. — .\nlio(|uia: n"* 6 



and 8. (anulinaniarca: n» 23. 



Var. lunatus W. and G. S. West. .\nliiii|nia : n'i 6. 



iif). Scenedesmus quadricauda (^Turp, ) Bréb. — .Viiliocjuia : n" 7. Cundina- 

 marca : n» i4- 



Var. maximus W. and G. S. West. — Ciindinamarca : n» 24. 



Var. rectangularis var. nov. 



Cœnobiis c cellnlis 2 vel 4 Forniatis. compaclis, a lalere visis pleninKjiic curvalis; 

 cellulis rectangiilaribus, laleribus rectis, polis leviler convexis ; spinis ad angulos e.xle- 

 riores cellularuni terininaliiiin brcvihus et incnivatis e[ syepe cuin spinis addilionibus 

 brevioribus ad celbilas ullas irrt'siilariler disposilis. 



Long. cell. i4-2i [>. ; lai. ceil. O-io u. iPI. XXI, fig. i4-2i). 



Anlioqiiia : Laguna Santa l\ila near .\ngelopolis, Central Andes ; allit. 1600 m. 

 N"' 1 1 and 12. 



Tliis variety occiirrcd in great quantily fVoiu tlie above-nuMilione»! localily. .No othcr 

 described variety of Sccn. quadricauda possesses cells of tlie saine slia[)e as lliose of var. 

 rectangularis. In oulline thev reniind one of the cells of Scen. perforalus Lem.m., but 

 in (Ulier respects the colonies are quite différent. 



116. Scenedesmus acutiformis Schrôder var. brasiliensis (Boulin 1 W. and (i. S. 



129 



