li;is;ilil)iis rcc,(;in;;iiliiriliiis cl ItmIit niliinihilis, l;iliMiliris siiliiiiirillliilis irl siiltrcrli» Mev'lH- 

 siiiic ciiiiM'xis), Mii^iilis ,i|iii-:ilil)ii', lali- ml iniil;il i-^, j|iiii' li-\ ilrr ciiiiirE^iliiilo-rrlilsr) ili riwdid ; 

 ,1 hilci'c \isM' (iIiIiiiil;;)', LiIi'i Unis |i;iij|lclis, .'i|iii'i- hili- lol iiikImIo ; :i v<;rlir<; visa- clliplir'ii- ; 

 imMiihi'iiiiii |)iiiicliil;i. I'\ ii'iKiidc siiii^ulo. 



l.oiH;'. .Sy-.'^o (A ; l.il. i.'i-ifiiA; hil. isllim. '-^l'-; «Tiiss. i i-i f ,.'> ;/.. ( l'I. W 1 1 , lii^. /|S-/|(j). 



Aii/iiK/iiiit : Hui; iiciir lin- l,;iniifi;i ;iliu\i' .Miwiclliii, Ci-nli.il \ii(i<;s; iillil. y.înu iri. 

 N" f). 



This siiiall spi'i'ii's (ici'iii'n'd in iiliiiiiiliincc ;iiiil cNliiliili'd mm'v (•(»lisl;iiil «•|i;ir;icl<Ts. Il 

 is II cliisr ,'ilU' (tï (!. ilcrcdriis i Ki,insi:ii i I!ai:iii. jiiiI ils \;ir. siniiosuin i\A]si).j ItACIli., 

 rriiiii wliicli il is |niiii;iiilN- ilisi iiii;iiislic(l i]\ llic siili|i:ii ;illi-l (;iiiil slii^lldy «itIVCX) sitlcs of 



llic s ici'lls ;iMil llic liluiidh idiiiidcd ;i|pi<:il ;iiii;li-s. Il is also [)r<)|iotlion;H(;ly loiHÇ«T 



iiiiil llir ;i|iiics (d' lin- sciiiii-clls :in- irliisc in llir niiddli' oiily l'nol wiilely n-liisc iis in hII 

 l'oirns (d' ( 1 . i/rciulc/is). Murciiv ci-, iiolli sidc ;ind \crliciil vicws arc quili; fliirerr;til, rs|)(;- 

 cially (lie lallcr, in wliicli llicrc is im liiici' nt' llie sul)inaiiiillale pôles so ciiaraclerislic of 

 (J. dcccilriis. 



(J. />ro/)ini/iiii/n siundil idsn lie rinn[i;in'd willi C sii/ii/iiarlrntum, NonosT., from 

 wliirli il dill'i'is in ils sniidli'i' si/i', ils |ii()|iiirliiin;il(d\ î^iimIit leng-|li, ils wider islhmtis, 

 llie eiiiari^'iiiali'-rLMnsi' a|)icos (d' llic seiiiicolls, and in iIm' IVjrm of llie sidc view. 



;','i/|. Cosmariura pseudamœaum Wii.i.f;. - Anliiii|iiia : n"* 3, 'i (aiiuiulanl and ."i. 



:>•.!."). Cosmarium pseudexiguum il.vcin. ; \\ . and (i. S. Wesi.. .Mnimicr. Hrii. I)<.'sni. 

 III, i()(iS, [). (If), T. jo, (. 1)5, 2(1. 



i'oiiua /)/y'ri()r. iNirma cellulis Ijreviorihns, ci'li'iis ni in tmnia l\|iira. i.oni^. 22 }/. ; 

 ia(. 1") <j.\ lai. isllim. '.\ jx . 



C'undiiiainarca : 11" 2/1. 



As in oliier forms of this species tlie isthimis was t-xceediii^iy narrow. C. psenrlexi- 

 gunni appears to i)e one of llie mosl deeply constricled species of (lie i^enus. 



22C. Cosmarium pseudoconiiatum Nordst. — Aiilioquia : n" 5. 



227. Cosmarium pseudonitidulum Noudst. — Aiilioquia : n» 5. 



228. Cosmarium pseudoprotuberans KiaciiN. fmnia. I.oni^. ?i> |a ; lai. 27-28; lal. 

 isliiin. 8 \j. ; crass. 19 li.. 



Cundinaniarca : iv 28. 



229. Cosmarium pseudopyramidatum I.inii. — Anlioquia : ii" ."1. 



280. Cosmarium pyramidatum Baiin. — Anlioquia: n"* 1 , 2 !\ and ."1. CniKlina- 

 marca : n» •?.[\. 



•.>;)r. Cosmarium Quadrum Lund. — (aindiiiaiiiarca : n" 2,^. 



This species occurred in greal aliuiidance. Ali ihe specinions were rallier sniali. bul 

 not quitc small enough lo be piaced uuder var. minus IS'ordst. 



Long-. 67-64 [a; lat. 48-53 \l\ lal. islhm. 18-20 a; crass. 20-27 \f- 



232. Cosmarium Regnellii \Nille. — (amdinamarca : n" 23. 



233. Cosmarium Regiiesi Rkinsch. — Anlioquia: n"* i, 2 and 5. 



