CONTENTS OF VOLUME IV. 



I. riiE sicNiFicANiE Of BoN'i'; sTRrcTiRK. Pliitt's 1-3. jB// Thomdif Dwiijhl, M. D. (Fub- 



lislied October, 1886.) 1 



II. PlIE DKVKLOPSIENT OE THE OSTUICH EKUX, OxOCLEA STKLTHIOl'TEIils. PhlleS 4-7. B)/ Doitglas 



Houghton Camjibell, Ph.D. (Piiblislied April. 1887.) J 7 



III. The ixtroductios axd si'Ueau dv Piehis uapae in Noktii America, 186i)-188.5. Plate -8. 



B;/ Samiiel H. Scndiler. (Puliiished Septeniher, 1887 ) . . . . . .').S 



IN'. A STUDY OE NoKTH A.MEUK'AX CtEraxiaceae. Plates 9-12. Bi/ WiUiam Trdeaae. ( Pub- 

 lished January, 1888.) 71 



y. The ta('i)XIc of Georgf.^ and the Report on the i;EOLf)GV oi' Vermont. Phitc 13. B)j 



Jules Marcnu. (Published March, 1888.) in.-) 



\'\. The ExTO.MOi'HTHOUEAE OK the UxiTEi) States. Plates 14-21. Bi/ Roland Thaxttr. (Pub- 

 lished April, 1888.) 133 



\' 1 1 . I'liE FLORA OK THE KuRii.E IsLAXDs. Plate 22. Btj K. Mii/ube. (Published February, 



1890.) 203 



\"lll. PllYLOfiENY OF THE PeLECYI'DDA j THE AviCULIDAE AND TIIEIK ALLIES. PlatCS 23-30. By 



Robert Tmc>i Jackson. (Published July, 1890.) 277 



IX. New types of cockroaches from the carboniferols deposits of the rxriED States. 



Plates 31-32. By Srxmuel H. Scudder. (Published September, 1890.) .... 401 

 X New carboniferous Myriapoda from Illinois. Plates 33-38. By Samuel H. Scudder. 



(Pul)lished September, 1890.) 117 



XI. ]|.LU,STRATI0XS OF THE CARBONIFEROUS AKACHNIDA OF NoKTH .V.MEKKA, Ul THE ORDERS Ax- 



thracomarti axd Pedipalpi. Plates 39-40. By Sanuiel H. Scudder. (Published 



September, 1890.) 143 



XII. The ixsects of the triassic beds at Fairplay, Colokado. Plates 41-42. By Samuel H. 



Scudder. (Published September, 1890.) ......... 4.t7 



XIII Fusiox OF HAXDS. Plates 43-44. By Thomas Dirhjht. M.D.. LL.D. (Published 



August, 1892.) 473 



Xl\'. ,V BIBLIOGRAPHY OF VERTEBRATE EMP.RYl.lLoia . By Chlirles Sedljirick Mluol . (Publislied 



October, 1893.) 487 



Index ....... ...... (i I.) 



Errata ...... . . ... 018 



