1893.] MICROSCOPICAL JOUKNAL. 311 



Melosira granulata, (Ehr). Ralfs. 

 Surirella elegans, Ehr. 

 Surirella, Sp. 



Cyniatopleura solea, S. B. D. 

 Stephanodiscus minutus, Grun. 

 S. ningara, Ehr. 



PROTOCOCCOIDEAE. 



Raphidium polymorphum, Fres. 



Dictyosphas7-i.uvi ehrenberghiana, Naeg. 



Scenedesmus cnndatus, Carda. 



S. dimorphus, Kg. 



Pediastrum boryanum, (Turp). Men. 



P. pertusum. Kg. 



ANIMAL FORMS. 



INFUSORIA. 



Dinobryon sertularia, Ehr. 



Euglena viridis, Ehr. * 



Trachelomonas volvocina, Ehr. 



T. (Small, indet.) 



Feridinium tabulatum, Ehr. (Dead.) 



Liionotus, Sp. indet. 



ROTIFERE^. 



Anurea cochlearis, Gosse. 

 Philodina, Sp. indet. 



CR.USTACE^. 



Bosmina longirostris, (Mull.) Bd. 



Metric Equivalents. — The following should be learned or 

 at least kept ready for reference : 



Weights. 



To convert grains into grammes multiply by 0.065 



To convert grammes into grains multiply by 15.5 



To convert drachms into grammes multiply by , 3.9 



To convert ounces (avoir.) into grammes multiply by 28.4 



To convert pounds (avoir.) into grammes multiply by 453.6 



Measukes. 



To convert cubic centimeters into grains multiply by 15.5 



To convert cubic centimeters into drachms multiply by 0.26 



To convert cubic centimeters into ounces (avoir.) multiply by 0.036 



To convert pints into cubic centimeters multiply by 473. 



To convert litres into ounces (avoir.) multiply by 35.3 



To convert gallons into litres multiply by 3,8 



