III Because of the special nature and value of intact exsiccati collections, the three found in the Cheever Herbarium have been kept intact, and together treated as a separate section. The species therefore were not included in the index which follows, but will be found in a separate "Index to the Exsiccati of the Cheever Herbarium." Addendum Boxes B-36 to B-41 The addendum at the end of this index contains a fair number of slides belonging to both Group I and Group II. These slides were discovered after the collection had been organized and could not be included in the index A or B. Addendum Section A B-41: 71 Pleurosigma sp. B-41: 72 Synedra goulardi Bres. B-41: 73 Toxonidea gregorian Addendum Section B I. United States 1. Alaska B-36: 56 2. California B-36: 57 3. Connecticut B-37: 1-4 5-100 4. Maine B-38: 1-100 5. Maryland B-39: 1-100 6. Massachusetts B-40: 1-11 7. Nevada B-40: 12-14 8. New Hampshire B-40: 15-22 9. New Jersey B-40: 23-30 10. New York 31-32 11. Pennsylvania 33-37 12. Virginia 38-39 13. Washington 40-41 42 43-63 64-71 II. World Canada 72-74 South America 1. Brasil 75-79 2. Chile 80-81 3. Cuba 82 4. Guatemala 83 5. Peru B-40: 84-87 6. West Indies 88-90