CONTENTS OF NO. IV 



Art. XXX. — Observations on the External Characters and Habits of the 

 Troglodytes Niger, Geoff. By Thomas S. Savage, M. D., Corresponding 

 Member of the Boston Society of Natural History — and on its Organi- 

 zation, by Jeffries Wyman, M. D. (Continued from page 376.) . 37( 



Art. XXXI. — Descriptions and Figures of the Araneides of ihe United 

 States. By N. M. Hentz, (continued from p. 231), . . . 37e 



Art. XXXII. — Description of an African Beetle, allied to Scarabaeus 

 Polyphemus, with Remarks upon some other Insects of the same 

 Group. By T. W. Harris, M. D 39" 



Art. XXXIII. — On the Importance of Habit as a Guide to Accuracy in 

 systematical Arrangement, illustrated in the Instance of the Sylvia 

 petechia of Wilson, and all subsequent writers. By Thomas McCul- 

 loch, Jr . m 



Art. XXXIV. — On the Anatomy of Tebennophorus Carolmensis. By 

 Jeffries Wyman, M. D. . . ^Ut 



Aut. XXXV. — On the anatomical Structure of Glandina truncata of Say. 

 By Jeffries Wyman, M. D 41( 



Art. XXXVI. — Beauraontite and Lincolnite identical with Heulandile. 

 By Francis Alger. 42S 



Art. XXXVII. — Probable Influence of Icebergs upon Drift. By J. L. 

 Hayes, 



Art. XXXVIII. — Descriptions of Land Shells from the Province of Ta- 

 voy, in British Burmah. By Augustus A. Gould, M. D. . . 



Art. XXXIX. — Descriptions and Habits of some of the Birds of Yuca- 

 tan. By Samuel Cabot, Jr., M. D. 460 



it. XL. — Enumeration of the recent freshwater Mollusca which are 

 common to North America and Europe ; with Observations on Species 

 and their Distribution. By S. S. Halderman 



Art. XLI. — Descriptions and Notices of some of the Land Shells of 

 Cuba. By Augustus A. Gould, M. D 



Art. XLII. — Mineralogical Notices. By J. E. Tescheraacher, 



Art. XLIII. — Analysis of Pink Scapolite, and of Cerium Ochre, from 

 Bolton, Mass. By Charles T. Jackson. 



