134 ME. G. H. WAILES ON FRESHWATER RHIZOPODA 



Lakehurst, N.J., and around the ponds near Good Ground, L.I., the sphag- 

 num is inhabited by many individuals and species ; some species that are 

 unknown or very rare in Europe are there quite numerous or not uncommon. 



The following may be especially noted : — On Long Island are found 

 N. caudata and N. eqidcalceus, the latter of a special form, also an interesting 

 series of curved varieties of several species. At Lakehurst are found the 

 three species with beaded apertures that form a compact group, viz. N. tenella, 

 iV. griseola, and JY. cratera ; also iV. ansata \ N. vitrcea sp. ver., together 

 with a variety having a test bearing curiously arranged angular plates, and 

 N. scutellata inhabiting a test formed entirely of small quadrangular plates. 

 In both localities are found K. harhata, JS^. carinata, JS^. gracilis, and 

 W. tulmlata. 



Species which have been recorded from North America that were not 

 observed were N. higibbosa, JS'. lageniformis, and JS\ vas (39). 



The numerous curved tests which are found at Penney 's Pond, Good 

 Ground, suggest many points of interest. In addition to X. coUaris var. retorta, 

 Leidy, two other species, Xebela americana and Quadrula sijmmehnca, are 

 found there presenting the same modification ; this variation must be of rare 

 occurrence as Leidy records only a single test of this kind, and I am not 

 aware of any other record : the association of so many in one limited habitat 

 suggests that this form may be induced sporadically by certain local 

 conditions. 



Light is thrown on the question of the origin of the plates with which 

 the Nebelce construct their tests by the occurrence at Good Ground of the 

 tests of N. eqidcalceus and iV. coUaris containing, and sometimes largely 

 composed of, the scales of Eughjplia denticuJata var. minor, including even 

 spines with the basal scales still attached ; at Lakehurst, on the other hand, 

 are found N. scutellata and forms of A", vitnca with tests composed of 

 quadrangular or angular plates which can hardly have had a foreign origin. 



Nebela AMERICANA, Tardneh. 



Sitzber. bohm. Ges. Wiss. 1881 ; Abli. buhm. Ges. Wiss. xi. (188i^), pi. 3. figs. 15, 16. 



N. coUaris pars, Leidy, pi. 23. fig. 7 (30). 



N. americana, Casb &, Hopk., pi. 31. figs. 15-18 (10) ; Peuard, p. 363, figs. 4-6 (36). 



The identification of this species presents certain difficulties. As first 

 described by Taranek it is glabrous, not compressed, and intermediate in 

 outline between N.barbata, Leidy, pi. 24. figs. 14-17, ;ind figs. 18 & 19 

 {N. tuhdata, Brown). The only Nehda, with which I am acquainted, 

 answering to this description is N. longicollis. Pen., which is rare. A much 

 more common species having a compressed test, wedge-shaped in broad 

 view, has been generally accepted as the one which Taranek had under 

 observation. To exchange the names now would only cause confusion and 



