GBFUS EUGLYPHA— EUGLYPHA ALVEOLATA. 207 



and arranged with great regularity in longitudinal rows, alternating with 

 one another in the different rows. Commonly the plates appear of longitu- 

 dinally oval shape, and overlap at the contiguous borders so as to include 

 hexagonal areas enclosed by circles of minute elliptical areas, or they 

 appear of hexahedral shape, and are closely adapted together at the borders. 

 Ehrjenberg describes and figures in . his various communications a number 

 of forms in which the shell is represented as being composed of longitudi- 

 nal rows of alternating rectangular plates.* Of this kind I have seen 

 none, and incline to think, from my experience, that the shape of the plates 

 as thus described is illusory. The shell of the ordinary forms of Euglypha, 

 viewed with unfavorable light, or when the structure is* not distinct, will 

 appear to be composed in this way, when clearer definition will prove them 

 to exhibit the structure as above described. 



EUGLYPHA ALVEOLATA. 



Plate XXXV, figs. 1-18. 



JSuglypM alveolata. Dnjardin : Infusoires, 1841, 252, pi. ii, figs. 9, 10. — ^Perty : Kennt. kleinst. Lebensfor- 

 men, 1852, 187.— Pritchard: Hist. Infus. 1861, 556, pi. xxi, fig. 11.— Carter: An. Mag. Nat. 

 Hist. 1856, xviii, 221, pi. v, figs. 25-36; 1864,xiii,33,pl.ii,fig. 17.— Wallicli: Aa. Mag. Nat. 

 Hist. 1864, siii, 240, pi. xvl, figs. 41-45. — Hertwig and Lesser : Arch. mik. Anat. Suppl. 1874, 

 124, Taf. iii, Fig. 5.— Schulzo : Arch. mik. Anat. 1875, 97, Taf. v, Fig. 1, 2.— MicrograpMc 

 Dictiojiary,pl.23,fig.54.— Leidy: Pr. Ac. Nat. So. 1874, 225; 1877,262,321; 1878,171. 



Euglypha tuberculata. Dnjardin: Infusoires, 1841, 251, pi. ii, figs. 7, 8. — Perty: Kennt. kl. Lebensformen, 

 1852, 187. — Claparfede and Lachmann : fitudes Infus. et Kbizopodes, 1858-9, i, 456. — Pritch- 

 ard : Hist. Infus. 1861, 556. — MicrograpMc Dictionary, pi. 23, fig. 53. 



mfflugia areolata. Ehrenberg: Abb. Ak. Wis. Berlin, 1841,413, Taf. i.Fig. 8; Taf. ii.Fig. 4,5; Taf. iv, 

 Fig. 2; 1871,264. Monatsb. Ak. Wis. 1845, 319 ; 1848,215; 1849,89, 98, 191, 228, 321; 1853, 

 18i, 286, 322. Mikrogeologie, 1854, Taf. xxxii, Fig. 2 ; xxxviii, Fig. 2 ; xxxix. Fig. 25. Z weite 

 deutsche Nordpolarfahrt, 1874, Taf. iii, Fig. 23. 



mfflugia acanthophora. Ehrenberg : Ab. Ak. Wis. 1841, 413, Taf. It, Fig. 36 ; 1871, 264.— Pritchard : Hist. 

 Infus. 1861, 553, pl. xii. Fig. 64. 



JHfflugia kevigata. Ehrenberg : Ab. Ak. Wis. 1841, 413, Taf. ii. Fig. 43. 



Difflugia atriolata. Ehrenberg : Ibidem, Fig. 44. Monatsb. 1851, 321 ; 1853, 182. Mikrogeologie, 1854, Taf. 

 xxxiii. Fig. 3. 



Euglypha IcevU. Perty : Kennt. kleinst. Lebensformen, 1852, 187, Taf. viii. Fig. 18. 



Euglypha sel^era. Perty : Ibidem, fig. 19. 



Difflugia Floridm. Ehrenberg : Monatsb. Ak, Wis. 1853, 366. Mikrogeologie, 1854, Taf. xxxiv. Fig. 3. Abh. 

 Ak. Wis. 1871, 252. 



mfflugia pilosa. Ehrenberg : Mikrogeologie, 1854, Taf. xxxiv, B. t, Fig. 6. Abh. Ak. Wis. 1871, 256. 



mfflugia moluecensis. Ehrenberg : Abh. Ak. Wis. 1869, 48, Taf. ii, Fig. 12. 



mfflugia amphora. Ehrenberg : Ibidem, 1871, 248, Taf. iii, Fig. 17. 



mfflugia rectangularis. Ehrenberg : Ibidem, 256, Taf. iii, Fig. 16. Zweite deutsche Nordpolarfahrt, 1874, 

 Taf. iii. Fig. 20. 



mfflugia Boherii Muller. Ehrenberg : Abh. Ak. Wis. 1871, 256, Taf. ii, Fig. 16. 



mfflugia seriata. Ehrenberg: Ibidem, 257, Taf iii. Fig. 30. 



mfflugia setigera. Ehrenberg : Ibidem, Taf. ii, Fig. 30. 



mfflugia striata. Ehrenberg: Ibidem, 257. 



* Abhand. Akad. d. Wissenschaften, Berlin, 1871, Taf. iii, 16, 17. 



