GEXUS 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. 

 Ehrenberg 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. 



Euglypha alveolata. Dnjardin: Iufusoires, 1841, 252, pi. ii, figs. 9, 10. — Perty : Kennt. kleinst. Lebensfor- 

 men, 1852. 187.— Pritchard: Hist. Iufus. 18G1, £56, pi. xxi, fig. 11.— Carter: An. Mag. Nat. 

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

 Hist. 1864, xiii, 240, pi. xvi, ligs. 41-45. — Hertwig and Lesser : Arch. mik. Anat. Suppl. 1874, 

 124, Taf. iii, Fig. 5.— Sclmlzo: Arch. mik. Anat. 1875, 97, Taf. v, Fig. 1, 2.— Micro-graphic 

 Dictionary, pi. 23, fig. 54.— Leidy : Pr. Ac. Nat. Sc. 1874, 225; 1877,262,321; 1S78, 171. 



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

 1852, 187.— Claparede and Lachmann: Etudes Infus. et Ebizopodes, 1858-9, i, 456.— Pritch- 

 ard: Hist. Iufus. 1861,556. — Micrographic Dictionary, pi. 23, fig. 53. 



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

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

 182, 236, 322. Mikrogeologie, 1*54, Taf. xxxii, Fig. 2 ; xxxviii, Fig. 2 ; xxxix, Fig. 25. Zweite 

 deutsche Nordpolarfahrt, 1S74, Taf. iii, Fig. 23. 



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

 Iufus. 1861, 553, pi. xii, Fig. 64. 



Difflugia lasmgata. Ehrenberg : Ab. Ak. Wis. 1841, 413, Taf. ii, Fig. 43. 



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

 xxxiii, Fig. 3. 



Euglypha la-vis. Perty : Kennt. kleinst. Lebensformen, 1852, 187, Taf. viii, Fig. 18. 



Euglypha setigera. Perty : Ibidem, fig. 19. 



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

 Ak. Wis. 1871,252. 



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



Difflugia moluccensis. Ehrenberg : Abh. Ak. Wis. 1869, 48, Taf. ii, Fig. 12. 



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



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

 Taf. iii. Fig. 20. 



Difflugia Boberli Wilier. Ehrenberg : Abh. Ak. Wis. 1871, 256, Taf. ii, Fig. 16. 



Difflugia striata. Ehrenberg: Ibidem, 257, Taf. iii, Fig. 30. 



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



Difflugia striata. Ehrenberg : Ibidem, 257. 



' Abband. Akad. d. Wissenschafteu, Berlin, 1871, Taf. iii, 16, 17. 



