CONTENTS OF VOLUME IX. 



BY FEANK COLLIKS BAKEE. 



PAGE 



Art. VII. — On the Modification of the Apex in Gastropod Mollusks • 685 



BY THOS. L. CASEY. 



Art. VI.— Coleopterolo^ical Notices, VII 285 



BY O. F. COOK AND G. N. COLLINS. 



Art. I. — The CraspedosomatidBe of North America 1 



BY HAEOLD JACOBY. 



Art. II. — On the reduction of Stellar Photographs, with Special Eef erence 



to the Astro-Photographic Catalogue Plates 101 



Art. V. — On the Permanence of the Eutherfurd Photographic Plates . 195 



BY J. PLAYFAIE M'MUEEICH. 



Art. IV. — Notes on some Actinians from the Bahama Islands, Collected 



by the late Dr. J. I. Northrop . . . . . . .181 



BY HEINEICH EIES. 

 Art. III. — The Monoclinic Pyroxenes of New York State . . . 124 



Note. — For descriptive references to the twenty plates which accompany 

 the present volume, see pages 94-100, 179, 180, 194 and 686-704. 



