186 
36. Kalodictyon, novum. genus. Filamenta breviora, monili- 
formia, extremis in conoebium distensum retioulatum connexis; 
maculae hexagonae. Propogatio adhuc ignota. 
K. margaritatum, n. sp. K. coenobio retiformi, _indefinito 
numero hexagonis reticulationibus ; filamentis tenuibus, dilute fuscis, 
persertis cum triangulis et oblongis formis. Formae et triangulae et 
oblongae subhyalinae margaritae similes, angulis rotundatis et late- 
ribus modice concavis, per centrum omnes persertae, et ordinatae 
cum triangulis formis in angulis reticulationum, et oblongis formis 
in lateribus. Coenobium distensum in diluto muco in foliis Poto- 
mogetonis. Reticulationes paucis viridibus cellulis irregulariter distri 
butis. Diam. ret. .0025”-.003”; triang. .00064. oblg. .0006’"—.0013”. 
Slow river waters on Potamogeton; a rare and very remarkable 
plant. 
37- Hydrianum, Rabenh.—Z. swdsessile, n. sp. H. erectum, 
globosum, ellipticum, subsessile vel inferne in stipitem brevem 
subito attenuatum; apice nonnumquam late rotundato, saepius 
in tubuli formam, tubuli plantae diametro duplo breviore; cytio- 
plasmate viridi, initio in corpusculum globosum conglobato, deinde 
in zoogonidia multa soluto, quae per tubulum apertum singula 
elabuntur. Diam. .00028”—.0003”. 
Parasitic on Cladophora, etc. 
1, giganteum,n. sp. H. cellula stipitata, lanceolata, erecta, ver- 
tice obtuse rotundata, demum aperta, medio .o10’—.015’ ‘ diametro, 
8—-r10-plo longiore, utroque polo subequaliter attenuato et subequali 
diametro, .004’’-.005” ; cytiodermate cartilagineo, obscure aerugineo, 
vel fulvo-fuscescente, laevi, basi disciformi dilatata, quae bases multae 
conjunctae continuum cartilagineum thallum formant’in submersis 
sarmentis ; cytioplasmate aquoso, paucis minimis cellulis. 
Collected by J. Donnel Smith, head of St. Lucie River, Florida, 
March, 1877, from submerged twigs. 
38. Chlamydomonas, Ehrb.—Ch. pulvisculus, Ehrb. Green 
house tank. 
DESMIDI ACEAE. 
39. bane Ktz.—P. macrococca, Ktz. Intermingled with 
river plants. 
4o. Penium, Breb.—P. Naegelii, Breb. Dripping rocks.—P. 
margaritaceum, Breb. Pools. 
41. Sphaerozosma, Corda.—-S. vertebratum, Ralfs.—S. pulch- 
rum, Bailey. Sluggish waters, Pike Co. 
42. Cosmarium, Corda.—C. praemorsum, Breb.—C. Bitchin. 
Breb.—C. Phaseolus, Breb.—C. sportella, Breb.—C. latum, Breb.— 
C. moniliforme, Ralfs, All from pools. —C. Schliepackeanum, 
Grun. Wet rocks.—C. cruciatum, Breb. Swamps. 
C.. irregulare, n. sp. C. fere tam longum quam latum, profunde 
constrictum, sinu mediano lineari ; cytiodermate verruculoso ; verru- 
culis in series curvatas dispositis; semicellulis diametro plerumque fere. 
duplo longioribus; dorso late et plane truncato ; angulis inferioribus 
rotundatis, indistincte crenulatis, lateribus irregulariter crenatis; cre- 
nis inferioribus brevibus sed ad angulos superiores gradatim auctis, 
