ARCHER - 6 - 



- Some additional Desmidie;c. a few of them new, from the lato Galway gatherings p. 199 202. 



- Three very "closely allied'' and much resembling ininuts forms of Cosmarium p. -121. 



Dictyosphfflrium constrictum p. -122. 



- The Cylindror \,tis detected some years ago. p. -J22. 



- 1873 v. 13: A gathering made noar ''Toolc's Rocks" containing various Conjugate. includingDesmidie*, remarkable 



for the great number of distinct species simultaneously presenting themselves therein in conjugated state p. 99100. 



A very minute form of Euastrum [Euastrum elegans ft angustatum Wittr.J p. 101 & 102 103. 



A very pretty Cosmarium [Cosmarium speciosum Lnnd.| p. 101. 



- A sketch of a remarkable zygospore, hardly to do doubted to be desmidian p. 103. 



- The Freshwater Algse of Gotland and Olaud. by Dr. W. B. AVittrock. Translated in abstract with notes p. 

 117139. 



Several rare Desmidiese taken in Westmoreland and North Wales p. 212 -213. 

 Structure of Zygospore of Xanthidium armatum p. 310 311. 

 Staurastrum Ophiura, Lundell. new to England, p. 311. 



- Euastrum binale, var. angustatum Wittr. and E. binale var. insulare, Wittr., their occurence in Ireland, p. 315. 



- Cosmarium tetrachondrium. Lund, new to England p. 3L5. -- [g]. 



- New localities for Closterium Archerianum iCleve) and Cl. Cynthia do Notaris p. 319. [g]. 



- Euastrum bmale var. insulare Wittrock p. 434. 



- Zj'gospore of Staurastrum Brebissonii. p. 435. [g]. 



- 1874 v. 14: Alg;e and Rhizopoda from Hot springs of Azores p. 107. 



Cosmocladium saxoiiicum. De Bary exhibited, p. 212. 



- Zygospore of Micrasterias papillifera, for the first time fnund in Ireland p. 2 lit. 



- Micrasterias furcata. found for the first time in Ireland, exhibited along with M. radiosa p. 213. 



- Docidium coronatum Ehrh. exhibited p. 214. [g]. 



A new species of Staurastrum exhibited p. 422. [g]. 



- Double-spored or Three-sporrd form of Cylindrocystis Brcbis>onii p. 12:!. 



- 1875 v. 15: Cosmarium holmiense. /)' Lundell, and Cosmarium anceps Lund, new to Ireland p. 409. [g|. 



Cosmarium cyclicum Lundell new to Ireland p. 412. 



Singular and unprecedented case of conjugation between two distinct but allied. Desiuidiau s) ics p. Ill, 1 K>. 



- Dictyosphserium constrictum Archer, olim found conjugated and a true, though aberrant, Desmidian. p. 115. 



- 1870 v. 10: Bacteria (Bacillus') habitually forming a Nidus in Mucous investments of Algie. p. 1""'. l |)i; . 



- Micrasterias angulosa, Hantsch exhibited for the first time in Ireland p. 109. [g]. 



- Cosmarium Reinschii, n. s. exhibited p. 100. 



- Penium curtum Bri'b. exhibited, p. 235. [g]. 



- A Pseudo-Cosmarium - in other words, a Cosmarium-like exceptional state of an Arthrodesmus-incus lonn 

 exhibited. ]i. 23fi. 237. 



Notice, of some Desmidian forms allied to Closterium obtusum Bivb. p. 2:>s. 



Cosmarium Schliephackeanum, Nordst. new to Ireland p. :>:>'-'. 



Closterium obtusum. Bn'b.. new to Ireland, exhibited p. :!:!"<. 



- A very small form of Cosmarium Holmiense. Lundell exhibited, p. :!:!!. 

 New species of Closterium. exhibited [Cl. monoticniuinl p. 1 1 ">. 



New Cosmarium sp. exhibited p. -I in. 



Cosmarium pseudomargaritiferum Roinseh. ex herb. Reiuseh exhiiiiteii with its zygospore and note thereon, p. ll'>. 



- Cosmarium annulatuin. Nag. and three, neighbouring new forms exhibited, p. 117. 

 1^77 v. 17: Cosmarium tetragonum, Nag. Luiidell's so called form ol', showed p. H'2. 



- \ew species of Staurastrum, exhibited |S. Royanum] p. Id:!. 



- The unlike /ygo.-porc-. of two minute smooth closely iv-mnliling Cosmaria, exhibited, proving their specific di- 

 stinctness, the pu/,y,ling resemblance of the forms tliemselvi..-. nothvithstanding. p. I""'. . 



- A pu/.xling Desmiiiiau form ]). 106. 



Occtirren f Spomlylosium ] ml i- helium in a stipitate and attached condition, for th,. lirst time SO ob~er\ ed. p. 191. 



- Exhibition of rare, (some very striking I lesmidian species p. 192. 



- Extremely minute Cosmarium form with /ygospoiv. Indd to he a new species, exhibited, |C. miiiut N-imnni )<. 191. 



On a minute species of Cosmarium with smooth dark brown /.ygo-porr- p. :;n|. 



On a Cosmarium form seemingly tbr samr as Jacobsen's so called var. of Cosni. Bn b mi ]>. ;!(.i5 - :!i >i;. 

 A ni>w ^peri.-s of Staiirast nun flioun ]i. -Ilil. 



- 1878 v. 18: Zygospore of Slaiirastrnm tiirgi'si'dis. !. Not. p. KP,"I. 



- Kiiastritm ilivaricatum, Lundell, ne\\ t.o I'.ritam, r\liibited p. 108. [g]. 

 New Spi'.-irs of ClOSteriUm hie'.|i..la'Ve|, shown )i. 211. 



Ducidiuiii noilnsiiiii. Ami'rieaii example, exhibit, .! p. :!.Mi. 

 Is7'.i v. I'.i; N'i'u ( 'losti'ritim from \i> .In-sey ! rrassistriat inn | p. 1 21 1. 



l^h.n^ati'd uin.-rlliilar alua. allied to tin- so called Closterium obliisiun p. 121. 



- Cosmarinm n. sp. vr\ ininiite. with finely spinous Zygospore. i<\hihili'd. [lasio pOl , p. 12:!. 



Cosmarium fontigi'iium. Xordst. ],. 121. 



I' limn hirsntum. liaih'y. oi'i-uring in Scotland, exhibited, p. li!s. 



\ probably ni'w Cosmarium slnmn p. Ill, 



- Xanthidiiim acanthophorum NonKtrdi. exhibited, p. 117. 



- isso v . 20 : .Mirra-trrias lin^ata. exhibited p. I 1 ">. |g). 



- Cosmarium istmoi'lioinlnim, Xordst. now to Ireland. . xlnbit, 'd p. :!^'. 



