262 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



Fig. 4. Gibbula articulata Gould, type, greater diameter 7 mm. (top), p. 155. 



5. Gibbula articulata Gould (profile), p. 155. 



6. Gibbula articulata Gould (bottom), p. 155. 



7. Melanella asser, new species, type, length 1.7 mm., p. 68. 



Plate 26. 



Fig. 1. Gibbula hera, new species, type, greater diameter 8 mm. (top), p. 157. 



2. Gibbula hera, new species (profile), p. 157. 



3. Gibbula hera, new species, (bottom), p. 157. 



4. Gibbula fulgens Gould, type, altitude 8 mm. (top), p. 154. 



5. Gibbula fulgens Gould (profile), p. 154. 



6. Gibbula fulgens Gould (bottom), p. 154. 



Plate 27. 



Fig. 1. Gibbula aglaia, new species, type, greater diameter 6.4 mm. (top), p. 158. 



2. Gibbula aglaia, new species, (profile), p. 158. 



3. Gibbula aglaia, new species (bottom), p. 158. 



4. Gibbula fucata Gould, cotype, greater diameter 7.3 mm. (top), p. 155. 



5. Gibbula fucata Gould (profile), p. 155. 



6. Gibbula fucata Gould (bottom), p. 155. 



Plate 28. 



Fig. 1. Gibbula gaudiosa Gould, cotype, greater diameter 5.7 mm. (top), p. 156. 



2. Gibbula gaudiosa Gould (bottom), p. 156. 



3. Gibbula gaudiosa Gould (profile), p. 156. 



4. Cynisca africana, new species, type, greater diameter 2.6 mm. (top), p. 165. 



5. Cynisca africana, new species (profile), p. 165. 



6. Cynisca africana, new species (bottom), p. 165. 



7. Teinostoma alfredensis, type, greater diameter 2 mm. (top), p. 165. 



8. Teinostoma alfredensis (profile), p. 165. 



9. Teinostoma alfredensis (bottom), p. 165. 



10. Gibbula pintado Gould, type, greater diameter 5.6 mm. (profile), p. 160. 



11. Gibbula pintado Gould (top), p. 160. 



12. Gibbula pintado Gould (bottom), p. 160. 



Plate 29. 



Fig. 1. Cyclostremella africana, new species, type, greater diameter 2.1 mm. (top), p. 170. 



2. Cyclostremella africana, new species (profile), p. 170. 



3. Cyclostremella africana, new species (bottom), p. 170. 



4. Ilaira fulgens Gould, type, greater diameter 5 mm. (top), p. 166. 



5. Ilaira fulgens Gould (profile), p. 166. 



6. Ilaira fulgens Gould (bottom), p. 166. 



7. Gibbula medusa, new species, type, greater diameter 5 mm. (profile), p. 159. 



8. Gibbula medusa, new species (top), p. 159. 



9. Gibbula medusa, new species (bottom), p. 159. 



10. Cynisca alfredensis, new species, type, greater diameter 8 mm. (profile), p. 164. 



11. Cynisca alfredensis, new species, type (top), p. 164. 



12. Cynisca alfredensis, new species, type (bottom), p. 164. 



Plate 30. 



Fig. 1. Gibbula thalia, new species, type, greater diameter 5.5 mm. (top), p. 157. 



2. Gibbula thalia, new species (bottom), p. 157. 



3. Gibbula thalia, new species (profile), p. 157. 



