495 



Tripgoides macularius, 388. 

 Tripleuroceras, 289. 

 Triploocerns, 285. 

 Tripteroceros, 287. 

 Trocholites, 267. 

 Turdus fuscescens, 868. 



migratorius, 368. 



pallasi, 369. 



swainsoni, 369. 

 Turks Island, 242. 

 Tyrannus carolinensis, 380. 



Uranoceras, 298. 

 Uria grylle, 408. 

 Utamia torda, 411. 



Vaginoceras, 266. 

 Vestinautilus, 294. 

 Viburnum obvat-.m, 361. 

 Vireo solitarius, 372. 



Wadsworth, M. E. The argillite and 



conglomerate of the Boston Basin, 

 130; instances of atmospheric action 

 on sandstone. 201 ; the Fortieth Par- 

 allel rocks, 412; notes on the lithol- 

 ogy of the Island of Jura, 485. 



Walker Prizes for 1883, awarded to How- 

 ard Avers, 358; to H. W. Conn and 

 Win. Patten, 363. 



Watkhs, G. F. Remarks on sense of 

 taste in birds, 433. 



Whitman, C. 0. Rare form of blasto- 

 derm in the chick, 178. 



Xenodiscus, 338. 



ZlRKEL,, FkRD. 



collection of 



Survey, 109. 

 Zittleoceras, 284. 

 Zizyphus obtusifolins, 360 

 Zonotrichia albicollis, 376. 



On the petrographical 

 the Fortieth Parallel 



ERRATA. 



Page 191, 12th line, for " either overlie," read " either underlie." 



Page 188. 6th line, for " Sackuest," read " Sachuest." 



Page 255, note 3, for " Trematodiscus," read " Trcmatoceras." 



Page 256, third paragragh, 9th line, after" Nautilinidae" add " and Magnosellaridae." 



Page 256, fourth paragraph, 1st line, before "Nautilinidae" insert "lower forms of 

 the." 



Page 257, 4th line from bottom, read "lay " for " laid." 



Page 261, 1st line, after " Nautilinidae "add "and Magnosellaridae." 



Page 262, 2d lire from top, for " Clymeninnae," read " Clymeninae." 



Page 263, 6th line from bottom, after " Cretaceous " omit comma. 



Page 268, fourth paragraph, 3d line, between " in" and " type" insert "the." 



Page 272, 3d line from bottom, omit " strictly." 



Page 278, Note 2 transpose to page 278. 



Page 279, second paragraph, 1st line, after " generally have" add "an." 



Page 281, third paragraph, 5th line, for " imprassed," read " impressed." 



Pnge 281, Note 2, for " NtJsvs," read "N^SvV 



Page 285, Note 1, for " Pul ST ," read " 'PotIs" 



Page 286, third paragraph, last line but one, for " Sutnres," read " sutures." 



Page 288, second paragraph, 5th line, for "earliest," read " earlier." 



Page 288, seeond paragraph, 6th line, for " bur " read " but." 



Page 289, first paragraph, last line but one, after " Ephippioceras " change period to 

 comma. 



Page 291, first paragraph, 1st line, transfer " 1 " to third paragraph, 1st line, first 

 word. 



Page 301, first paragraph, 6th line, for " (Naut.) intermedium, sp. Sow." read " inor- 

 natum." 



Page 301, first paragraph, 7th line, for " pi. 27 " read "pi. 28." 



Page 321, Note 1, for " 2-jroeas" * - ead " 2iropa8os " 



Page 324, second paragraph, 5th line, between "forms" and " above " insert " of 

 Ammonitinae." 



Page 333, first paragraph, 2d line, for "obes" read "lobes." 



Page 335, for " Prolecanites " in brackets read " Prolecanitae." 



Page 358, 20th line, for " dishes," read " dirks." 



Plate 2, upper portion, the figure numbered "31," should be numbered "37." 



