48 



killing under the cover glass with i per cent, osmic acid and 

 staining for two hours with picro-carmine. I have repeatedly 

 found this rhizopod in widely separated localities of the littoral 

 region of Lake Pontchartrain, the water of which is brackish. 

 I have never taken it in fresh water, the habitat given it by 

 Frenzel ('97). 



BiOMYxiA VAGANS Leidy. 



This rhizopod, the existence of which as a good species is 

 doubted by many students, has come under my observation a 

 number of times, and I have had good opportunity to give it 

 critical study, which has resulted in convincing me that it is 

 entitled to its place as a true species. 



It has been reported a number of times from different parts of 

 the world and is therefore cosmopolitan. 1 have often taken it. in 

 fresh water and also in the brackish waters of Lakes Pontchar- 

 train and Borgne. Recently, I have found it in the Gulf. The 

 description of it given originally by Leidy ('97) can only be 

 amended so as to include the presence of very many small round 

 and unconnected nuclei, which were first demonstrated by Gruber 

 ('84) and has been repeatedly corroborated by me. 



PHYLLOMITUS AMYLOPHAGUS Klebs. 



According to the records, this asymmetrical flagellate seems to 

 be quite uncommon and its habitat heretofore confined to fresh 

 water as originally given by Klebs ('92). I have taken it repeat- 

 edly from Lake Pontchartrain (brackish water) and now record 

 it from the Gulf. 



Klebs' ('92) description is correct in every respect, and I have 

 only to add that in virtue of this form lending itself readily to 

 cultivation, I have been enabled to observe its mode of increase, 

 which is by long fission, as is the rule among the flagellates 

 ( Oxyrrhis marina and some of the Craspemonadina being the only 

 exceptions). This fission may originate at the anterior extremity, 

 as it usually does, at the posterior extremity or simultaneously 

 at both extremities. This is a unique departure from the cus- 

 tomary mode of fission, and I believe has no other representative, 

 excepting Scytomonas pusilla, in which the fission may originate 

 at either extremity. 



It is a voracious feeder. I have repeatedly seen a form with a 

 fungal filament, which it had incepted, protruding from both ex- 

 tremities so as to make it appear as if it had been impaled on a 

 spit. 



