GENUS NEBELA— NEBELA COLLAEIS. 1 15 



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, ncbel, a bottle. 

 Diffiugia: Ehrenberg, 1848. EeticeUa; AUodictya ; 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 Diffiugia. Mouth inferior, terminal, oval. Sarcode 

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

 sphenia, etc. 



NEBELA COLLARIS. 



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



Diffiugia collaris. Ehrenberg: Monatsb. Ak. Wis. Berlin, 1848, 218; Microgeologie. 1854, 331; Abh. Ak. 



Wis. Berlin, 1871, 143, Taf. ii, Fig. 27; Taf. iii, Fig. 21. 

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



Taf. ii, Fig. 26. 

 Diffiugia cancellata. Ehrenberg : Monatsb. Ak. Wis. 1848, 379 ; Microg. 1854, 331 ; Ab. Ak. Wis. 1871, 145, 



Taf. ii, Fig. 3. 

 Diffiugia Carpio. Ehrenberg: Microg. 1854, 115. 



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

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

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

 Diffiugia laxa. Ehrenberg: Microg. 18j4, — ; Ab. Ak. Wis. 1871, 254, Taf. iii, Fig. 22. 

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

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

 D. EeticeUa collaris (AUodictya). Ehrenberg: Ab. Ak. Wis. 1871, 247. 

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

 D. IieticeUa cancrllata (Odontodictya). Ehrenberg: Ibidem. 

 D. EeticeUa Carpio (AUodictya). Ehrenberg: Ibidem. 

 D. IieticeUa binodis (Odontodictya). Ehrenberg: Ibidem. 

 D. EeticeUa annulata (AUodictya). Ehrenberg: Ibidem. 

 D. EeticeUa laxa (AUodictya). Ehrenberg: Ibidem. 



Diffiugia cellulifcra. Ehreuberg: Deutsche Nordpolarfahrt, 1874, 460, 466, Taf. iii, Fig. 24. 

 Diffiugia (Kebela) numata. Leidy: Proc. Ac. Nat. Sc. 1874, 157. 

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



•Abhand. Akad. Wissens. Berlin, 1871, 246. 

 10 RUIZ 



*• 



