LOUIS CABOT. Immature State of the Odonata, Part IV. E. L. MARK. Studies on Lepidosteus, continued. E. L. MARK. On Arachnactis. Reports on the Results of Dredging Operations in 1877, 1878, 1879, and 1880, in charge of ALEXANDER AGASSIZ, by the U. S. Coast Survey Steamer "Blake," as follows:-- A. MILNE EDWARDS and E. L. BOUVIER. The Crustacea of the "Blake." A. E. VERRILL. The Alcyonaria of the "Blake." Reports on the Results of the Expedition of 1891 of the U. S. Fish Commission Steamer "Albatross," Lieutenant Commander Z. L. TANNER, U. S. N., Commanding, in charge of ALEXANDER AGASSIZ, as follows:-- K. BRANDT. The Sagittae. W. A. HERDMAN. The Ascidians. K. BRANDT. The Thalassicolae. S. J. HICKSON. The Antipathids. O. CARLGREN. The Actinarians. E. L. MARK. Branchiocerianthus. W. R. COE. The Nemerteans. JOHN MURRAY. The Bottom REINHARD HOHRN. The Eyes of Specimens. Deep-Sea Crustacea. P. SCHIEMENZ. The Pteropods and H. J. HANSEN. The Cirripeds. Heteropods. H. J. HANSEN. The Schizopods. THEO. STUDER. The Alcyonarians. H. B. WARD. The Sipunculids. Reports on the Scientific Results of the Expedition to the Tropical Pacific, in charge of ALEXANDER AGASSIZ on the U. S. Fish Commission Steamer, "Albatross," from August, 1899, to March, 1900, Commander Jefferson F. Moser, U. S. N., Commanding, as follows:-- ---- The Volcanic Rocks. G. O. SARS. The Copepods. ---- The Coralliferous Limestones. L. STEJNEGER. The Reptiles. G. W. MULLER. The Ostracods. T. W. VAUGHAN. The Corals, MARY J. RATHBUN. The Crustacea Recent and Fossil. Decapoda. PUBLICATIONS OF THE MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD COLLEGE. There have been published of the BULLETIN Vols. I. to LIV., LVI., and LVIII. to LXIV.; of the MEMOIRS, Vols. I. to XLII., and also XLIV. to XLVI., and XLVIII. Vols. LV., LVII. and LXV. of the BULLETIN, and Vols. XLIII., XLVII. and XLIX. of the MEMOIRS, are now in course of publication. The BULLETIN AND MEMOIRS are devoted to the publication of original work by the Officers of the Museum, of investigations carried on by students and others in the different Laboratories of Natural History, and of work by specialists based upon the Museum Collections and Explorations. The following publications are in preparation:-- Reports on the Results of Dredging Operations from 1877 to 1880, in charge of Alexander Agassiz, by the U. S. Coast Survey Steamer "Blake," Lieut. Commander C. D. Sigsbee, U. S. N., and Commander J. R. Bartlett, U. S. N., commanding. Reports on the Results of the Expedition of 1891 of the U. S. Fish Commission Steamer "Albatross," Lieut. Commander Z. L. Tanner, U. S. N., commanding, in charge of Alexander Agassiz.