i6 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 'JJ 



In the Miliolidae, especially such genera as Quinquelocidina, the 

 apertural view and two side vieivs are usually necessary for complete 

 description ; one of the latter will show four chambers, the other three. 

 In Biloculina, a front viezv and side view are frequently used, the 

 latter in the Hne of the plane of the joining of the two exterior 

 chambers. 



Fig. 5. — Lagena, showing a, side view and b, apertural view. 

 This has a definite neck and phialine lip. 



Fig. 6. — Nodosaria, showing a, side view ; b, apertural view. 



Fig. 7. — Cristcllaria, showing a, side view ; b, apertural view. 



The lines between the chambers on the exterior should be known 

 as sutures and the internal walls as septae. The initial chamber is 

 know<n as the prolocidum and may be either microspheric or megalo- 

 sphcric. The aperture may be modied by a distinct tooth as in many 

 of the Miliolidae (fig. 10), or have a distinct phialine lip as in Lagena 

 (%• 5) o'f Uvigerina (fig. 9). 



In many forms such as Nonionina (fig. i), there is a distinct 

 umbilicus developed. A study of published figures will give even 

 the beginner a good general idea of the application of most of the 

 descriptive terms used. 



