FOKAMINIFERA OF THE NORTH PACIFIC OCEAN. 103 



Plate 33. 



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



2. Biloculina denticulata, var. striolota, X 05. a, front view; /<, apertuial view. 



3. Biloculina denticulata, var. striolata, X 33. fl, front view; ^, apertural view. 



Flate 34. 



Fig. 1. Biloculina comata, X 33. a, front view; b, apertural view. 



2. Biloculina comata, var. serratula, X 33. 



3. Biloculina comata, var. serratula, X 33. a, front view; b, apertural view. 



4. Biloculina millctlii, X 33. a, front view; b, apertural view. 



5. Biloculina millctlii, X 33. 



6. Biloculina semicoslata, X 33. a, front view; b, side view; c, apertural view. 



Plate 35. 



Fig. 1. Biloculina flintii, X 33. a, front view; 6, side view; c, apertural view. 



2. Nevillina coronata, X 25. Showing penultimate chamber within. 



3. Nevillina coronata, X 25. a, front view; b, apertural view. 



4. Nevillina coronata, X 25. Triloculine stage. 



5. Nevillina coronata, X 25. Biloeuline stage. (Figs. 2-5 after Sidebottom.) 



Plate 36. 



Fig. 1. Peneroplis pertusus, X 33. a, side view; b, apertural view. 



2. Peneroplis pertusus, var. arietinus, X 33. o, front view; 6, apertural view. 



3. Peneroplis pertusus, var. X 33. a, side view; 6, apertural view. 



Plate 37. 



Fig. 1. Peneroplis pcrtusus, X 20. Aperture. 



2. Ptneroplis pertusus, X 20. Aperture. 



3. Peneroplis pertusus, var. planatus, X 65. a, side view; b, apertural view. 



4. Peneroplis pertusus, var. carinatus, X 33. a, side view; 6, apertural view. 



5. Peneroplis pcrtusus, var. arietinus, X 27. Section. (After Brady.) 



6. Peneroplis pertusus, X 33. Aperture. 



7. 8. Orbiculina adunca, X 20. (After Brady.) 



Plate 38. 



Fig. 1. Orbitolites marginalis, X 30. a, surface view; b, peripheral view. 



2. Orbitolites marginalis, X 65. Apertures. 



3. Orbitolites duplex, X 75. Apertures. 



4. Orbitolites duplex, X 33. a, surface view; b, peripheral view. 



Plate 39. 



Fig. 1. Orbitolites duplex, X 30. Specimen with secondary growth. 



2. Orbitolites complanata, X 30. a, surface view; b, peripheral view. 



3. Alveolina boscii, X 12. a, front view; b, end view. (After Brady.) 



4. Alveolina melo, X 33. a, front view; b, end view. (After Brady.) 



