38 DR. б. S. WEST ON THE ALGA OF 
Lagerst., Navicula gibba, (Bhrenb.) Kütz., N. major, Kütz., N. appendiculata, 
(Ag.) Kütz., JV. /ridis, Ehrenb., var. affinis, (Ehrenb.) Van Heurck, Gompho- 
nema gracile, Ehrenb., 6. tenellum, Kütz., Nitzschia Palea, (Kütz.) W. Sm. 
The second pool was not stagnant, and really formed a part of the boggy 
or marshy stream which drains Ottelia Creek into the Yan Yean Reservoir, 
The Algæ were mostly Chlorophyceæ and largely Desmids. The following 
species were observed :— 
Chlorophyceæ.— Oedogonium undulatum, (Bréb.) A. Dr. (sterile), Coleochete 
irregularis, Pringsh., Ulothriæ idiospora, sp. nọ ПафоШит conjunctivum, 
Мере, Triploceras gracile, Bail., var. robustum var. n., Luastrum ansatum, 
Ralfs, Л. Turneri, West, Cosmarium obsoletum, (Hantzsch) Reinsch, var. 
sitvense, Gutw., C. granatum, Bréb., C. pseudoprotuberans, Kirchn., C. bireme, 
Nordst., C. Regnesi, Reinsch, C. quadratuhan, (Е. Gay) De Toni, C. venustum, 
(Bréb.) Arch., var. induratum, Nordst., C. impressulum, Elfv., forma sub- 
orthogona (Racib.) nob. ( =C. suborthogonum, Racib.), С. sphalerostichum, 
Nordst., C. Blyttii, Wille, C. amen, Dréb., var. mediolre, Nordst., Stau- 
rastrum Патау, sp. n. ©. orbieulare, Ralfs, var. depressum, Roy A Biss., 
S. dilatatum, Ehrenb., var. obtusilobum, De Not., S. striolatum, (Nüg.) Arch. 
(with zygospores), Onychonema filiforme, (Ehrenb.) Roy & Biss., Pediastrum 
Tetras, (Ehrenb.) Ralfs, Scenedesmus acutiformis, Sehröder, Dietyospharinn 
pulehellum, Wood, Glwocystis gigas, (Kütz) Lagerh., var. тайна. West. 
Bacillarieæ.— Tabellaria floceulosa, (Roth) Kütz., Synedra Ulna, (Nitzsch) 
Ehrenb., Navicula major, Kütz., N. radiosa, Kütz., Vanheurckia rhomboides, 
(Ehrenb.) Dréb., Cocconema gracile, (Rabenh.) G. S. West. 
Мухорһусеж. — Anabena sp. (sterile). 
loonounoxG RESERVOIR. 
Г. Plankton—This was colleeted by boat on July 25th, 1907, along a 
course clear of weeds. The material contained large quantities of decaying 
organic matter and fine sand, mixed chiefly with Diatoms. and is of 
particular interest in comparison with the plankton of the Yan Yean. 
Ceratium Hirundinella was not uncommon although quite absent from the 
Yan Yean, and a beautiful new variety (var. pulcherrima) of Micrasterias 
7 homasiana was also frequent. The most interesting Diatom was Gyrosigma 
distortum var, Parkeri, and the frustules of Vanhenrekia rhomboides reached а 
large size (135 р in length). The following were the species observed :— 
Chlorophycez. — Fragments of Oedogonium sp. and Microspora sp., Closterium 
Venus, Kütz., Micrasterias Thomasiana, Arch., var. pulcherrima var. n. 
Bacillarieæ.— Tabellaria flocculosa, (Roth) Kütz., Synedra Ulna, (Nitzsch) 
Ehrenb., Fragilaria crotonensis, (А. M.-Edw.) Kitton, Æunotia pectinalis, 
(Dillw.) Rabenh., А. erispula, sp. n., Naricula cardinalis, Ehrenb., №. gracilis, 
Kitz., N. gibba, (Ehrenb.) Kütz, N. viridis, Ки, N. Drébissonir, Wütz., 
