GENUS NEBELA— NEBELA COLLARIS. 115 



latter would apply to the first members of the subdivision indicated, which 

 appear to be only varieties or at most two species of Cyphoderia, neither 

 of the names could be considered as properly taking precedence of 

 Quadrula distinctly applied to Assulina assulata, the fourth member of 

 Ehrenberg's list.* 



NEBELA. 



Greek, nebel, a bottle. 

 Difflugia: Ehrenberg, 1848. Retieella; Allodictya; Odontodictya ; Ehrenberg, 1871. Nebela: Leidy, 1874. 



Shell usually compressed pyriform, transparent, colorless, with or 

 without appendages, composed of cancellated membrane or of peculiar 

 intrinsic structural elements of variable form and size, mostly of circular 

 or oval disks, of narrow rectangular plates or rods, or of thin, less regular, 

 angular plates, often almost exclusively of one or the other, sometimes of 

 two or more intermingled in variable proportions, sometimes of chitinoid 

 membrane incorporated with more or less extrinsic elements, and sometimes 

 of these entirely, as in Difflugia, Mouth inferior, terminal, oval. Sarcode 

 colorless; in form, constitution, and arrangement as in Difflugia, Hyalo- 

 sphenia, etc. 



NEBELA COLLARIS. 



Plates XXII: XXIII. figs. 1-7: XXIV, figs. 11, 12. 



Difflugia collaris. Ehrenberg: Monatsb. Ak. Wis. Berlin, 1848, 218; Jficrogeologie, 1854, 331; Abh. Ak. 



Wis. Berlin. 1-71. 14:!, Taf. ii, Fig. -27; Taf. iii, Fig. 21. 

 Difflugia reticulata. Ehrenberg: Monatsb. Ak. Wis. 1848, 218; Microg. 1854, 331 ; Ab. Ak. Wis. 1871, 143, 



Taf. ii, Fig. 26. 

 Difflugia cancellaia. Ebrenberg : Mouatsb. Ak. Wis. 1848, 379 ; Microg. 1854, 331 ; Ab. Ak. Wis. 1871, 145, 



Taf. ii, Fig. 3. 

 Difflugia Carpio. Ebrenberg: Microg. 1854, lit). 



D. Lagena ft. Carpio. Ebrenberg: Microg. 1854, 331; Abh. Ak. Wis. 1871, 251, Taf. ii, Fig. 22, 27. 

 Difflugia binodw. Ehrenberg: Microg. 1854, 331; Abh. Ak. Wis. 250, Taf. ii, Fig. 22, 23. 

 Difflugia annulata. Ehrenberg: Microg. 1854, — ; Ab. Ak. Wis. 1871, 249, Taf. iii, Fig. 19. 

 Difflugia laxa, Ehrenberg: Microg. 1854, — ; Ab. Ak. Wis. 1871, 254, Taf. iii, Fig. 22. 

 Difflugia peltigeracea. Carter: An. Mag. Nat. Hist, xiii, 1864, pi. i, fig. 12. 

 Difflugia symmetrica. Wallieh: An. Mag. Nat. Hist, xiii, 1864, pi. xvi, figs. 27-33. 

 D. Retieella collaris (Allodictya). EhrenboTg: Ab. Ak. Wis. 1871, 247. 

 D. Retieella reticulata (Odontodictya). Ehrenberg: Ibidem. 

 D. Retieella canccllata (Odontodictya). Ehrenberg: Ibidem. 

 D. Retieella Carpio (Allodictya). Ehrenberg: Ibidem. 

 D. Retieella bitiodis (Odontodictya). Ehrenberg: Ibidem. 

 D. Retieella annulata (Allodictya). Ehrenberg: Ibidem. 

 D. Retieella laxa (Allodictya). Ehrenberg: Ibidem. 



Difflugia cellulifera. Ehrenberg: Deutsche Nordpolarfahrt, 1874, 460, 466, Taf. iii, Fig. 24. 

 Difflugia (Xebela) numata. Leidy: Proe. Ac. Nat, Sc. 1874, 157. 

 Nebela numata. Leidy: Proc. Ac. N;it. Sc. 1876, 116, figs. 1-5; 1877, 264. 



*Abband. Akad. Wissens. Berlin, 1871, 246. 

 10 RHIZ 



