1918] MAcCAUGHEY—HAWAIIAN ALGAE 137 
DESMIDIACEAE 
The desmids are represented in the Hawaiian flora by the 
following known forms; there are undoubtedly very many forms 
as yet undescribed: 
Desmidium aptogonium var. acutius Nordst., Gymnozyga moniliformis 
Ehrenb., Gonatozygon Ralfsii De Bary, Cylindrocystis Brebissonii Menegh., 
Closterium didymotocum var. multinucleatum Nordst., C. praelongum Breb., 
C. Pritchardianum Archer, C. lineatum var. sandvicense Nordst., C. dianae 
Ehrenb., C. parvulum Naeg., C. moniliferum (Bory) Ehrenb., C. setaceum 
Ehrenb., Penium lamellosum Breb., P. navicula Breb., Tetmemorus granulatus 
forma minor Nordst., T. levis var. continuus Nordst., Disphinctium palangula 
(Breb.) Hansg., D. subglobosum (Nordst.) DeToni, D. connatum (Breb.) De 
Bary, D. annulatum Naeg., D. speciosum var. simplex Nordst., Pleurotaenium 
trabecula (Ehrenb.) Naeg., P. Ehrenbergii (Ralfs) Delp., P. indicum (Gren.) 
Lund., P. nodulosum (Breb.) De Bary, Xanthidium armatum var. fissum 
Nordst., Cosmarium granatum var. subgranatum Nordst., C. Meneghini 
reb., C. crenatum Ralfs, C. holmiense Lund., C. parvulum Breb. forma 
spetbergensis Nordst., C. sulcatum Nordst., C. depauperatum Nordst., 
C. anisochondrum Nordst., Arthrodesmus octocornis forma havaiensis Nordst., 
Euastrum binale (Turp.) Ralfs, E. ansatum Lund., E. sinuosum Lenorm., 
Micrasterias truncata (Corda) Breb., M. adscendens Nordst., Staurastrum 
subtile Nordst., S. spongiosum var. Griffithianum (Naeg.) Lagerh., S. sub- 
scabrum Nordst., S. muticum Breb., S. monticulosum var. duplex Nordst., S. 
margaritaceum Ehrenb., S. tenuissimum West. 
This gives a total of 15 genera and 47 known species. 
FLAGELLATAE 
The following flagellates have been collected in ditches, taro 
patches, rice fields, fishponds, and other quiet, shallow waters: 
Salpincoeca pyxidium S.K., Dinobryon sertularia Ehrenb., Euglena spiro- 
gyra Ehrenb., Phacus pyrum (Ehrenb.) Stein., P. pleuronectes Nitzsch., 
Trachelomonas volvocina Ehrenb. var. minuta Lemm., T. oblonga Lemm. var. 
truncata Lemm., T. hispida (Perty) Stein. 
SILICOFLAGELLATAE 
Several species have been taken in plankton between Hawaii and 
Laysan, as follows: 
Dictyocha fibula var. messanensis (Haeckel) Lemm., var. stapedia 
(Haeckel) Lemm., Distephanus speculum (Ehrenb.) Haeckel. 
