44 



The plankton from several surface hauls, six or seven miles out 

 in the Gulf, was secured with a modified Birge net made of No. 

 20 millers' silk. Besides the protozoa listed, a very large number 

 of typically marine diatoms were taken in this plankton and are 

 recorded in an appendix to this contribution. 



St. John's Bayou is a fairly large body of brackish water which 

 empties into Calcasieu Pass, a few miles from the Gulf. It has a 

 natural oyster reef, the yield of which is very uncertain on ac- 

 count of the rapid changes in the salinity of its waters. This bayou 

 was examined with special reference to the diatoms, which were 

 found in fairly large numbers ; the genera agreeing with those re- 

 corded from the plankton of the Gulf with the exception that 

 Bacillaria paradoxa was present and in great abundance. 



All material collected was examined alive on the same or 

 next day. While this method is not as convenient as that of kil- 

 ling and examining at one's leisure, one is more certain of a 

 positive identification. 



Forms from the Beach (Littoral zone) : 



Amoeba proteus Leidy. 



Gringa Uliformis Frenzel. 



Pamphagiis hyalinus Ehr. 



Actinophrys sol Ehr. 



Actinosphaerium eichornii Ehr. 



Oikomonas termo Ehr. 



Bodo caudatns Stein. 



Bodo glohosa Stein. 



Phylloniitiis aniylophagus Klebs. 



Rhynchomonas nasiita Stokes, sp. 



Tetramitus descissus Perty 



Euglena acus Ehr. 



Trachelomonas lagenella Stein. 



Petalomonas abscissa Duj. 



Cryptomonas ovata Ehr. 



Feridinium cinctiim Ehr. 



Lacrymaria lagemda C. & L. 



Prordon teres Ehr. 



Prorodon edentaUis C. & L. 



Mesodinium acarus Stein. 



Lionatus fasciola Ehr. 



Loxophylhim setigernm Ouenn.' 



