102 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Plate 23. 



Fig. 1. Ilauerina ornatissima, X 65. a, front view; b, apertural view. 



2. Hauerina bradyi, X 65. a, front view; b, apertural view. 



3. Hauerina circinata, X 33. (After Brady.) 



4. Ilauerina circinata, X 33. (After Brady.) 



5. Ilauerina ornatissima, X 65. a, front view; 6, apertural view. 



Plate 24. 



Fig. 1. Sigmoilina celata, X 65. a, front view; b, apertural view. 



2. Sigmoilina sigmoklea, X 65. a, front view; b, apertural view. 



3. Sigmoilina sigmoidea, section, X 40. (After Brady.) 



4. Ilauerina fragilissima, X 65. a, front view; b, apertural view. 



Plate 25. 



Fig. 1. Triloculina tricarinata, X 30. a, front view; b, apertural view of very large 

 specimen. 



2. Triloculina tricarinata, X 33. a, front view; b, apertural view. 



3. Triloculina trigonula, X 33. a, front view; b, apertural view. 



4. Triloculina circularis, X 65. a, b, side views; c, apertural view. 



Plate 26. 



Fig. 1. Triloculina circularis, X 33. a, front view; b, apertural view. 



2. Triloculina circularis, var. sublineata, X 65. a, b, side views. 



3. Triloculina oblonga, X 33. a, front view; b, apertural view. 



Plate 27. 



Fig. 1. Triloculine stage of Biloculina, X 65. a, front view; b, apertural view. 



2. Triloculina tcrquemiana, X 65. a, front view; 6, apertural view. 



3. Triloculina insignis, X 65. a, front view; b, apertural view. 



4. Triloculina linnaeana, X 33. a, front view; b, apertural view. 



Plate 28. 



Fig. 1. Biloculina depressa, X 33. a, front view; b, side view; c, apertural view. 



2. Biloculina depressa, X 33. a, front view; b, apertural view. 



3. Biloculina murrhyna, X 33. a, front view; b, apertural view. 



Plate 29. 



Fig. 1. Biloculina murrhyna, X 65. a, front view; b, side view; c, apertural view. 

 2. Biloculina serrata, X 65. a, front view; b, side view; c, apertural view, speci- 

 men with irregular margin. 



Plate 30. 



Fig. 1. Biloculina vesperlilio, X 20. a, front view; b, side view; c, apertural view of 

 very large specimen. 

 2. Biloculina sarsii, X 33. a, front view; b, apertural view. 



Plate 31. 



Fig. 1. Biloculina elongata, X 33. a, front view; b, side view; c, apertural view. 

 2. Biloculina globulus, X 65. a, front view; b, side view; c, apertural view. 



Plate 32. 



Fig. 1. Biloculina anomala, X 65. a, front view; b, side view; c, apertural view. 

 2. Biloculina lucemula, X 65. a, front view; 6, side view; c, apertural view. 



