Clare Island Survey — Fresh-water Algae. 16 47 



Scenedesmus horridus, Cosmarium laeve, Merismopaedia glavea, Syiiedm 

 pulchella, Diatoma elongatum, Frat/ilaria mutubilis, Bhoicosphaeriia curvata, 

 Navicula elliptica, N. cryptocephala, N, a/nyphisbaena, &c. 



In an association in a pool on Croaghmore, among a small quantity of a 

 barren CEdogonium and a Bulbochaete the dominant species was Closterium 

 moniliferum, and Netrium Digitus was sub-dominant; the rest are enumerated 

 in point of order as to their prevalence: — Tabellaria Jlocculosa, Spondylosium 

 pulchellum, Cosmarium angulosum v. concinnum, Oocystissolitiiria, Cylindrocystis 

 Brebissonii, Chlorobotrys rcgularis, Navicula Brebissonii, Hillhousia sp., 

 Achnanthcs exilis, Mastogloia Smithii, Euastmm pectinatum, E. denticulatutti, 

 Micrmterias denticulata, &c. 



Associated in very varying proportions with Cladophora flavescens as the 

 dominant alga (considering bulk only) in one pool (quite a different locality 

 from the last one for the same alga) on Clare Island were : — Mougeotia sp. 

 (sterile), Cosmarium subtumidum v. minor, C.subcrenatum, C. laeve v.cymatium, 

 C. Botrytis v. mediolacve, Cocconema gastroides, C. Cistida, Cocconema leptoceras 

 v. elongata, Achnanthcs exilis, Gomphonema olivaceum, G. parvulum Cocconeis 

 Placentu/a and its variety lincata (by far the most abundant diatom epiphytic 

 on the Cladophora), Dentwida tenuis v. frigida, Epithemia turgida, Ewnotia 

 major, Navicula limosa, N. cryptocephala, N. semimdum, N. lanceolata v. 

 phyllepta, &c. 



The following were associated with Utricidaria minor in Lough Avullin 

 in Clare Island ; the first four enumerated were dominant collectively ; if any 

 of the four showed prevalence, it was the first one: — Cosmarium rectangulave 

 (gotlandicum), Chlorobotrys regularis, Xanthidium Smithii, Staurastrum 

 aciculiferum, S. margaritaceum, 8. punctulatum, S. muticuin f. minor, 

 Spondylosium pulchellum, Euastrum binale, Tetmemorus Brebissonii, Penium 

 Cylindrus, Hyalotheca dissiliens, Schizochlamys delicatula, Oocystis solitaria, 

 Crucigenia rectangularc, Botryococcus Braunii, Chroocoeeus macrococcus, 

 G/ococapsa montana (probably washed in from turfy bank), Vanheurckia 

 rhomboides and its var. saxonica, Uinuelearia tatrana, Mougeotia sp. (sterile). 

 Oedogonium (2 sterile spp.). 



An association (Clare Island] among a gathering of Mougeot-ia gracillima 

 with zygospores and another sterile species of Mougeotia, consisted of the 

 following, enumerated as nearly as possible in the order of their prevalence : — 

 Tetmemorus granulatus, Hyalotheca dissiliens, Pleurotaenium Trdbecxda \. 

 elavatum, Closterium siriolatum, Tabellaria Jlocculosa, Euastrum bidentatum^ 

 Staurastrum punctulatum, S. orbicu/arc v. Italfsii, S. Mcriani, S. sexcosfatum, 

 Euastrum pectiriatutii, Myxonema nanum, Cosmarium tiiuium. Surirdlu 

 pinnata, &c, 



