LISTS OF FRESHWATER RHIZOPODS, INDICATING THE MANY 

 FORMS WHICH OCCUR TOGETHER IN CERTAIN LOCALITIES. 



I. LIST OF RHIZOPODS OBSERVED IN THE SEDIMENT OF WATER 



SQUEEZED INTO A WATCH CRYSTAL FROM A SMALL BUNCH OF 

 SPHAGNUM COLLECTED IN THE CEDAR SWAMP IN THE VICIN- 

 ITY OF MALAGA, GLOUCESTER COUNTY, NEW JERSEY, JUNE 6, 



1879. 



1. Diffltjgia pyrifokmis. Forms like those of figs. 14, 22-25, pi. x. Frequent. 



2. D. acuminata. Like those of figs. 23-26, pi. xiii. Frequent. 



3. D. constricta. Like those of figs. 5-7, 37-44, pi. xviii. Frequent. 



4. D. globxjlosa. Small forms; numerous. 



5. D. arcula. Figs. 34-37, pL xv. Occasional. 



6. D. spiralis. Few. 



7. Nebela collaris. Many varieties. Flask-like forms, with neck of variable length; 



length 0.06 mm. to 0.066 mm. ; greater breadth 0.027 mm. to 0.036 mm. Broader 

 pyriform kind, with less well defined neck: length 0.072 mm. to 0.132 mm.; 

 greater breadth 0.042 mm. to 0.09 mm. Variety N. Mnodis, as in figs. 1-7, pi. 

 xxii: length 0.12 mm.; greater breadth 0.054 mm. Varieties with the shell 

 merging in structure into that of Difflugia, composed of irregularly angular and 

 rod-like plates, or variable proportions of these with diatoms and fragments of 

 the same, or with round or oval disks : sizes ranging from 0.09 mm. to 0.15 mm. 

 in length by 0.084 mm. to 0.12 mm. in greater breadth. Variety N. rctorta, a 

 peculiar form for the first time observed; a single specimen as represented in 

 the woodcut on page 151; shell retort-form, or resembling in shape that of 

 Cyphoderia ampulla, but in structure characteristic of Nebela, being composed of 

 circular disks of variable size : length 0.144 mm.; greater breadth 0.072 mm.; 

 less breadth 0.036 mm. ; greater breadth of mouth 0.027 mm. 



8. N. flabellultjm. Length 0.09 mm. ; greater breadth 0.096 mm. Comparatively 



few. 



9. N. barbata. Occasional. 



10. N. ansata. Shell composed of circular disks. Length 0.21 mm. to 0.24 mm. ; 

 greater breadth at fundus 0.102 mm. to 0.108 mm.; between ends of processes 

 0.132 mm. to 0.144 mm. Few. 



II. N. caeinata. Length 0.216 mm. to 0.228 mm.; greater breadth 0.156 mm.; depth 



of keel 0.018 mm. Rare. 

 12. N. caudata. As in figs. 22-24, pi. xxvi. Rare. 



19 Rniz 289 



