_ 5 - ARCHER 



Speoimens of Spirotsenia parvula. p. 191. 



Cosmarium curtum Raifs) showed. p. 192 3. 



- A uumber of fresh examples of the zygospores of sonio Desmidiaee;e, which, so far as he as aware, had not 

 yet beon met with. p. 273 74. 



A very puzzling little form (Cosmarium tuberoulatum). p. 275. 

 1867 v. 7: Micrasterias Thomasiana, exhihited. p. 88 [g]. 



A vorv minute new species of Cosmarium with its zygospore, gathered at Kilbride, ncar Blessington, county of 

 Wicklow. (Cosmarium lobatosporuim p. 1702. 



Exhibited fiue specimens of the various stages of oonjugation in Closterium lineatum, showing its remarkable 

 double zygospores p. 173. 



Showed specimens and drawings of the various stages of the dovelopincnt aml of tlie perfoct zygosporo of Spiro- 

 tsenia condensata Bivb. especially interesting as being tlic first .... p. '233. 



Showed in the same gathering conjugated examples of Penium closterioides p. 23-1. 



A variety of Desmidiese conjugated [Micrasterias rotata, dentioulata. Desmidium Swartzii . . .] showed. p. 296 

 207. 



Two forms not hitherto met with in Ireland. (Docidium baculum (Breb.) and Euastrum circulare var. ji (Balfs 

 p. 2978. 



A minute alga new to Britain. Cosmocladium Saxonicum, de Bary i>. 298 -9. 



1868 v. 8: Irish specimens of Euastrum didelta. conjugated p. 66. 



- Showed specimens of a Staurastrum which he considered identiu.il with Staurastrum apiculatum (Breb.) p, 67 8. 



Showed. new to Ireland, Spirotsenia minuta Thuret p. 68. [g]. 



Exhibited jjood recent specimens of tlie two little algae lately recorded by him from Wales Dictyosphaerium 

 reniforme and Cosmocladium saxonicum p. 68. [g]. 



Showed conjugated specimens. with tlie zygospores, of Penium (Ehr.i Breb. p. 68. 



Desired to record and to exhibit some examples of the zygospore of Closterium costatum (Corda) for tho first 

 time seen conjugated. p. 118. 



Likewise showed a Closterium new to this country, Closterium cynthia Dc Notaris p. 118. 



Cosmocladium saxonicum from Callery bog p. 120 [g]. 



Specimens of Micrasterias Hermanniaua (Keinsch) p. 190. 



Micrasterias fimbriata. Ralfs. p. 286 - 7. 



A curions case of malformation in Closterium striolatum p. 288. 



Presented numerous examples of a verv singular-looking encystod statc. so to call it, of Staurastrum cuspidatum 

 Breb. 289 -291. 



Malformation seen in Desmidiese p. 291 2. 



A number of Desmidieas showing tlieir zygospores. p. 2924. 



Staurastrum Arachne in Ireland, p. 296. [g]. 



- Becorded the occurrence of Micrasterias fimbriata (Ralfs) from Callery, p. 296. 



1869 v. 9: A few new or rare forms of Desmidiefe. chieflv Staurastra, taken on an excursion to County Galway, p. 

 97-8. - [g]. 



Thc three very interesting forms shown by Dr. Barker. p. 194196. 



A fine new Staurastrum from Conneinara (Staurastrum verticillatum), p. 196. 



The occurrence of Micrasterias crux melitensis ;Ehr.) Ralfs in Connemara, p. 196. [g]. 



Specimens taken in Co. Tipperary of Spha?rozosma filiforme (Ehr.) Auct. a form of Gonatozygon Balfsii (de 

 Baryi. p. 198. 



A new Staurastrum from Galway (Staurastrum maamense), p. 200. 



Brought forward a number of Desmidiese, taken at G-lengariff. p. 1221. 



Zygospore of a Cosmarium, confounded with Cosmarium margaritiferum, p. 425. 

 l s 7o v. 10: A singular and interesting form of Staurastrum gracile, p. 86 7. 



A minute little Staurastrum ( most resembled Staurastrum heve). p. 89. 



The plane form nf Desmidium aptogonum (Breb. . p. 90. new to Britain. Arthrodesmus bifidus (Breb.i, p. 90. 



Showed Cosmarium annulatum (Nag.\ p. 92. [gl 



An interesting condition nf a minnte scytonematous plant [Palmogloea micrococca (Ki\tz).[, p. 2023. 



A new and very mimvfce form nf Spirottenia, (S. tenerrima). p. 203. 



A very pretty. seemingly now. Cosmarium, which most approached C. cristatum [= Cosmarium quadrifarium 

 Lund. ?]. p. 205. ' 



A new Cosmarium nearest C. commissurale) p. 308. 



1871. v. 11: Exliibited several Desmidieae. Splnerozosma secedens de Bary Staurastrum Usve, var. Clevei Wittr. 

 Staurastrum elongatum. showed. A new species of Euastrum. p. 923. 



Shnwed examples of Staurastruin maamense, and of Micrasterias fimbriata, p. 95. [g]. 



The zygospores of Staurastrum furcigerum, p. 95. 



Brought for exhibition two new species of Staurastrum, one of Cosmarium. p. 1001. [g]. 



Examples of the desmid Pleurotajnium cosmarioides, p. 2112. 

 1872 v. 12: Conjugated examples of Spiroteenia truncata p. 85 & 90. 



Karer Desmidiese p. 85 [g]. 



- Staurastrum oxyacanthum [compressed form] p. 89. 



A plane or compressed variety of Staurastrum vestitum p. 94. 



One or two sketches of new Desmidian species [Docidium nodosum] p. 193194. 



A rare little Alga [Cosmocladium saxonicumj p. 195. 



