292 



to the list. Forms whose antecedent minimum does not fall on 

 June 28 or July 5 are designated by a superior 1 ; those whose 

 maximum does not fall on July 19 or 26, by a superior 2 ; and those 

 whose subsequent minimum is not on July 26 or August 2, by a 

 superior 3.' 



The component forms and groups are Crenoihrix, etc. 1 , total 

 Schizophyce, Microcystis ichthyoblabe 1 , total Chlorophycea, Actinas- 

 trum hantzschii, Crucigenia rectangularis, Pediastrum boryanum 1 ' 2 ' 3 , 

 P. pertusum 2 ' 3 , Raphidium polymorphum 1 , Scenedesmus genuinus, 

 S. obliquus, S. quadricauda, Schroederia setigera, total Bacillariacece 1 , 

 Cyclotella kuetzingiana, Diatoma elongatum 1 , Fragilaria virescens 2 , 

 Melosira granulata var. spinosa 1 , M. varians 2 , Navicula spp., Synedra 

 acus, total Conjugates 1 , Closterium acerosum, C. gracilis, total Protozoa, 

 total Mastigophora, Eudorina elegans, Euglena acus, E. oxyuris, 

 E. viridis, Glenodinium cinctum, Lepocindis ovum, Pandorina 

 morum 3 , Phacus longicauda 1 - 2> 3 , P. pleuronectes 2 ' 3 , Platydorina 

 caudata, Pleodorina calif ornica, Trachelomonas acuminata 1 , T. 

 hispida 3 , T. volvocina, total Rhizopoda, Difflugia globulosa, total 

 Ciliata 2 , Codonella crater a 2 , Halteria grandinella 2 * 3 , Tintinnidium 

 fluviatile 2 ' 3 , total Rotifera, total Bdelloida 1 ' 2 , total Ploima, Anurcsa 

 cochlearis and var. tecta, eggs of A. cochlearis and var. tecta, A. 

 hypelasma, Asplanchna brightwellii 1 ' 2> 3 , Brachionus angularis and 

 var. bidens, eggs of B. angularis and var. bidens, B. bakeri and vars. 

 duniorbicularis 1 , melhemi, and tuber culus 1 ' 2 , total of all varieties 

 of B. bakeri, B. budapestinensis, B. militaris 1 ' 2 , B. pala and var. 

 amphiceros, B. urceolaris var. bursarius, B. variabilis 2 * 3 , Mastigocerca 

 carinata 1 , Monostyla bulla, Polyarthra platyptera, eggs of P. platyp- 

 tera 2 ' 3 , Rattulustigris 2 , Synch<ztapectinata l ,S. stylata, eggsofSynchceta 1 , 

 Triarthra terminalis 2 ' 3 , Pedalion mirum 1 ' 3 , total Entomostraca 1 ' 3 , 

 total Cladocera 1 ' 2> 3 , Bosmina longirostris 1 ' 3 , Ceriodaphnia scitula, 

 Chydorus sphcericus,Diaphanosoma brachyurum 3 ,Moina micrura 1 ' 2 ' 3 , 

 total Copepoda lj 2> 3 , Cyclops viridis var. brevispinosus and var. 

 insectus, C. edax, young Cyclops 1 , nauplii of Copepoda 1 ' 3 . 



An examination of the preceding list and of the qualitative data 

 of Table I., reveals the fact that 71 of the more typical planktonts 

 are found in appreciable numbers in the plankton during this 

 month. To this number we may add 6 immature forms separately 

 listed in the table and 14 group totals, making in all 91 sets of 

 statistical data bearing on the components of this pulse. An analy- 



