FAMILY 17. OPTHALMIDIIDAE 165 



Genus OPHTHALMIDIUM Zwingli and Kiibler, 1870 

 Plate 20, figure 6; plate 21, figure 4 



Genotype, by designation, Ophthalmidium porosum Zwingli and Kiibler 



Ophthalmidium Zwingli and Kubler, Foram. Schweiz. Jura, 1870, p. 46. 

 Hauerina (part) H. B. Brady (not d'Orbigny), Quart. Journ. Micr. Sci., 



vol. 19, 1879, p. 268. 

 Hauerinella Schubert, Pal. Zeitschr., vol. 3, 1920, p. 162 (genoholotype, 



Ophthalmidmm inconstans H. B. Brady). 



Test planispiral, compressed, not involute, consisting- of a 

 globular proloculum followed by a planispiral tubular chamber 

 of usually two or more coils, the following chambers decreasing 

 in relative length, loose coiled, the intermediate area filled with 

 a thin, shelly plate ; aperture at the open end of the chamber, 

 rounded, without lip or tooth. 



Genus SPIROPTHALMIDIUM Cushman, 1927 



Plate 20, figure 7; plate 21, figure 5 

 Genoholotype, Spirolomlma aciitimargo H. B. Brady (part) 



Spiropthalmidium Cushman, Contr. Cushman Lab. Foram. Res., vol. 3, 



1927, p. 37. 

 Spiroloculina (part) H. B. Brady (not d'Orbigny), Rep. Voy. Challenger, 



Zoology, vol. 9, 1884, p. 154. 



Test similar to Ophthalmidium, but accelerated, the stage 

 having two chambers in a coil quickly reached; plate between 

 the chambers usually present ; aperture simple, without teeth. 



Lias to Recent. 



Genus DISCOSPIRINIA Munier-Chalmas, 1902 

 Plate 20, figure 8; plate 21, figure 6 

 Genotype, by designation, Orbitolites tenuissvma W. B. Carpenter 

 Discospirinia Munier-Chalmas, Bull. Soc. Geol. France, ser. 4, vol. 2, 



1902, p. 352. 

 Cyclophthalmidium Lister, in Lankester, A Treatise on Zoology, pt. 1, 

 fasc. II, 1903, p. 110 (footnote) (genoholotype, OrbitoliteH tenuissima 

 W. B. Carpenter). 

 Orbitolites (part) of authors. 



Test in the young similar to Ophthalmidium, later chambers 

 annular with incomplete divisions into chamberlets ; apertures 

 at the periphery of the very thin test. 



Tertiary and Recent. 



