12 APPENDIX 



DESIDERATA 



AND 



SPECIMENS FOB SALE AND EXCHANGE. 



ALPHEUS HYATT, Essex Institute, Salem, Mass. 



Offers to exchange identified specimens of Fresh water Polyzoa, from 

 various localities in New England, for specimens from any other locality. 

 PROF. H. C. WOOD, JR., Academy of Natural Sciences, Philadelphia, Pa. 

 Solicits Myriapods or Centipedes, and Phalangidae or "Daddy-long-legs," 

 from all parts of North America. The former in order to perfect his pub- 

 lished monograph on the North American species of the group, and the lat- 

 ter with the intention of monographing them. They should be preserved in 

 alcohol or very strong whiskey in small mouthed bottles. All collections 

 will be returned labeled, if desired. The smaller species are especially desired, 

 also any notes on the habits of any of the species. Prof. Wood has a few 

 copies of his monograph of the Myriapoda of North America which he will 

 give for really valuable collections. The Phalangidae may be distinguished 

 from the true spiders by the head not being distinct from the abdomen. 

 DB. S. C. WILLIAMS, Silver Springs, Lancaster Co., Pa. 



Minerals and Local Insects for exchange. 

 H. G. BRTTCKHART, Silver Springs, Lancaster Co., Pa. 



Local Mollusks and Coleoptera for exchange. 

 N. VICKART, 262 Chestnut St., Lynn, Mass. (Taxidermist and Dealer). 



Has Birds and other specimens for sale or exchange. 

 DR. F. STEIN, Museum der k. Universitat, Berlin, Prussia. 



Has for sale the following Insects from the collection of the late Dr. 

 Schaum. Elatrides (7 boxes), 200 Thalers; Buprestides (4 boxes), 75 Thalers; 

 Chrysomelides (23 boxes), 150 Thalers; Scydmaenides and Pselaphides (num- 

 ber not given), 120 Thalers ; Cerambycides (European), 40 Thalers. 



THE WALKER PRIZES. 



" The following prizes were founded by the late DB. WILLIAM J. WALKER, for 

 the best memoirs, and in the English language, on subjects proposed by a committee 

 appointed by the Council of the BOSTON SOCIETY OF NATURAL HISTORY. The first 

 and second are to be awarded annually ; the third, once in five years, beginning 1870. 



First For the best memoir presented, a prize of sixty dollars may be awarded. 

 If however, the memoir be one of marked merit, the amount awarded may be in- 

 creased to one hundred dollars, at the discretion of the committee. 



Second For the next best memoir, a prize not exceeding fifty dollars may be 

 awarded at the discretion of the committee : but neither of the above prizes shall be 

 awarded unless the memoirs presented shall be deemed of adequate merit. 



Third GRAND HONORARY PRIZE. The Council of the Society may award the 

 sum of five hundred dollars for such scientific investigation or discovery in natural 

 history as they may think deserving thereof; provided such investigation or discov. 

 ery shall have first been made known and published in the United States of America ; 



