144 



MR. G. H. WAILES ON FRESHWATER RHIZOPODA 



Genus Eugltpha, Dujardin. 



The study o£ the American species of this genus has resulted in the 

 addition of one new species and five new varieties, and a revision of the table 

 of species published in the Clare Island Survey (45) is rendered necessary ^. 



Division I. Spines when iwesent always modified scales. Transverse section ci 

 (except E. bryopbila) and aperture circular. 



1. E. aspera. Pen Scutiform scales ; rough test. 



2. E. crenulata, sp. nov Denticulated scutiform scales ; spines. 



Var. minor, var. nov. Do. do. ; glabrous or spiued. 



3. E. scutigera, Pen. Scutiform scales ; glabrous. 



4. E. armata, Wailes Oval scales ; spines around apex. 



5. E. alveolata, Duj Circular or oval scales ; glabrous. 



Var. minor, Tardnek. . . . Do. do. 



Var. cirrata, var. nov. . . Short spines at apex. 



6. E. mucronata, Leidy Single or double spine at apex. 



7. E. cristata. Zeidy Spines in tuft at apex. 



Var. major, Wailes .... Glabrous. 



Var. acicularis, var. ?iov. Single or double spine at apex. 



8. E. brachiata, Leidy Lateral spines near aperture. 



Var. librata, var. nov. . . Oar-shaped arms near middle of test. 



9. E. bryopbila, Bro2vn Tuft of spines at apex ; test slightly com 



pressed. 



Division II. S2nnes, ivhen present, alioays articulated. 

 Section A. Test compressed, aperture circular. 



10. E. filifera, Penard Long spines in single or double rows, 



Var. spinosa, var. nov. . . Spines scattered over test. 



11. E. strigosa [Ehrenb.) Leidy, Tliickened aperture-scales. Spines. 



/. glabra & heterospina. 

 Var. muscorum, Wailes Test wider than tvpa ; scales smaller. 



12. E. rotunda, Wailes Thin aperture-scales ; glabrous. 



Section B. Test compressed, aperture oval. 



13. E. Itevis, Perty Uudenticulate aperture-scales; glabrous. 



(Mayhave subcircular section and aperture.) 



14. E. ciliata, Bhrenb. spec, Thin denticulated aperture-scales ; spines. 



+'. glabra & heterospina. 



15. E. compressa. Carter, Lenticular section ; spines. 



f, glabra. 



•cidar 



Length. 



150-170 ju 



115-140 IX 

 80-110 IX 

 77- 88 IX 

 55-100 IX 

 45-100 IX 

 30- 4.5 [X 

 65- 75 /i 



108-140 IX 

 33- 71 fx 

 60- 90 IX 

 84- 94 )u 

 93-128^ 



100-104 A* 

 35- 52 IX 



55- 93 IX 



60- 90 IX 

 45-100 fi 



50- 80 iu' 

 22- 52 IX 



22- 55 /i 

 40- 90 iU 

 70-132 IX 



* Instances are rare in which the identity of individuals of this genus is doubtful, 

 provided the tests are in good condition and the specific characters can be clearly observed ; 

 tests slightly crushed (accidentally) are to be guarded against. Active individuals are the 

 best for study, but in some species it may be necessary to isolate and treat them with 

 sulphuric acid, first cold and dilute to dissolve the plasma, and then with concentrated acid 

 and boiled to drvness to disintegrate the test into its elements. 



