THE FAMILY MILIOLID^ 89 



species, which is found in some frequency in the 

 ' calcaire grossier ' (Middle Eocene.) of the Paris 

 Basin. Externally F. discolifJius resembles a 

 laterally compressed Bilociilina having a faintly 

 striate surface, but the porous nature of the aperture 

 reveals its internal labyrinthular or subdivided 

 character. It often attains to a considerable size, 

 sometimes as much as G mm. in length. 



Two other species of Fahularia are known, one, 

 closely related to the above form, F. Zitteli of 

 Schwager, which was found in beds in Egypt of 

 nearly similar age to those of the Paris Basin ; and 

 another lately described from the Miocene beds of 

 Muddy Creek, Victoria, by Schlumberger, under the 

 name of F. HowcJdni. 



Middle Focene. (Plate, figs. M and N.) 



Genus Sinrolocnlina., D'Oebigny. 



The chambers in the shells of the genus Sjnro- 

 loculina are arranged in a single plane, and the 

 whole of them are visible on either side of the test. 

 The aperture is generally circular with a toothed or 

 T-shaped projection. Sometimes the aperture is 

 prolonged into a neck or salient tube. This type is 

 usually characteristic of shallow-water faunas, both 

 in temperate and tropical areas, but one species, 

 >S'. tenuis, is found at various depths down to 2,750 

 fathoms. Carho-Penniav to Fecent. 



Examples. — H. asjjeriila, Karrer, ' Sitz. Ak. Wiss. 

 Wien,' vol. Iviii. Abth. 1, 1868, p. 136, pi. i. fig. 10. 



This species has a thin complanate shell, and 



