44 PUBLICATIONS OF THE ZOOLOGICAL MUSEUM. 
No. 2, Studies from the Newport Marine Laboratory. XVI. Development of OS- 
SEOUS FISHES. II. By Atexanper Aaasswz and C. 0. WHiTman. With 20 
Plates. (Preparing.) 
Vol. XV. contains : — 
Reports on the Results of DREDGING by the U. S. Coast Survey Steamer “Blake.” 
XXXTI. Report on the ANNELIDS. By Ernst Esters. pp. vi, 335. 60 Plates. 
October, 1887. $12.50. 
Vol. XVI. contains : — 
No. 1. Notes on the TAXODIUM DISTICHIUM, or BALD CYPRESS. By N.S. 
SHALER. pp.16. June, 1887. 
No.2. On the Original CONNECTION of the Eastern and Western COAL FIELDS 
OF THE OHIO VALLEY. By N.S. SwHater. pp.12. June, 1887. 
*For Nos. 1 and 2, apply to Prof. N. S. SHALER. 
No.3. The Genesis of the ARIETIDA. By Atpxevs Hyart. (sine) 
(Vol. XVI. fo be continued.) 
In preparation : — 
Illustrations of North American MARINE INVERTEBRATES, from drawings by 
BURKHARDT, SONREL, and A. AGASsIz, prepared under the Direction of L. AGAssiz. Selec- 
tions from EMBRYOLOGICAL MONOGRAPHS, compiled by A. Acassiz, W. Faxon, 
and E. L. Marx (discontinued for the present), Papers, by E. L. Marx, on the Develop- 
ment of LEPIDOSTEUS and of ARACHNACTIS ; by M. B. Wansworta ; and by 
Scorr and Osborne, on FOSSIL MAMMALS. 
Reports on the DREDGING Operations for 1877, 1878, 1879, and 1880, in Charge of 
ALEXANDER AGassiz, by the U.S. C. 8. Steamer ‘‘Blake.” H, B. Brapy (FORAMINIF- 
ERA), P. H. Carpenter (COMATULA), W. H. Datt (MOLLUSKS of the Gulf of 
Mexico and the Caribbean Sea), G. B. GoopE and T, H. Bean (East Coast FISHES, and 
FISHES of the Gulf of Mexico and the Caribbean Sea), A. E. Vern and W. H. 
Dati (East Coast MOLLUSKS), A. A. Husrecat (NEMERTEANS), A. Mitnz-Epwarps 
(CRUSTACEA), and A. ©, Verrin (ALCYONARIA). 
In the Preface to the Zoolozischer Jahresbericht for 1886, the publications of the Museum of Com- 
parative Zodlogy are mentioned as among the periodicals given to irregular ways. While it is true, 
that, for the sake of keeping together the successive parts of an extended monograph, two or three vol- 
umes of the Memoirs and of the Bulletins of the Museum are frequently in the course of publication, 
yet care has always been taken to show on the title page of the completed volume the years which 
it covers, 
The Museum publications are not periodicals issued at fixed periods, — they must of necessity appear 
at irregular intervals, — but each number of the Memoirs and of the Bulletins is issued with a separate 
cover, showing the month of its publication and indicating plainly its relation to any volume of the 
series: Each number is distributed as soon as it comes from the binder to the various scientific socie- 
ties and specialists on the exchange list of the Museum. The author’s copies do not differ in any way 
from those distributed by the Museum, and are sent out at the same time. 
The practice of the Museum in regard to its publications does not differ from that of the most care- 
fully edited scientific periodicals. In addition to the indications of dates of publication to be found on 
the title pages of completed volumes, and on the covers of the separate numbers of the Memoirs and of | 
the Bulletins, the Museum has issued from time to time in its Annual Report a “ List of Publications,” 
giving the date of publication of each number of the Memoirs and Bulletins. 
It is hardly necessary to state that the Zodlogical Station at Naples, which edits the Zoologischer 
Jahresbericht, has always received from the Museum the material necessary for the dates of publica- 
tion of the Museum Memoirs and Bulletins. It may not be out of place to mention that the quarto 
publications of the Zodlogical Station at Naples are issued and dated upon the same plan which 
Dr. Mayer finds so undesirable in an American publication. 
