DEPARTMENT OF MARINE BIOLOGY. 171 



With the exception of 6, for which material was obtained but once, the 

 methods as given are those reached after careful testing of different concen- 

 trations of the salts used, and the methods finally selected have all been tested 

 several times. Details of the comparison of the effects of treatment with 

 CaCU and SrCl2 with NaCl are interesting and important, but must await 

 the full presentation of the results of the investigation. 



During the past year, working in the zoological laboratory of the Uni- 

 versity of California, I have completed and prepared for publication the 

 results of my investigations made while a member of the expedition to Torres 

 Strait. These reports deal with the cytology and embryology of Echino- 

 metra mathaei, Peronella lesueuri, and Salmacis virgulata, together with a 

 discussion of experiments in hybridization between Echinometra mathaei 

 and the crinoid Comatula pectinata. 



One of my papers, "Studies on the Hybridization of Echinoids {Cidaris 

 trihuloides) ," has been published during the year as part of Publication No. 

 312 of the Carnegie Institution of Washington. 



Studies of the Molluscan Fauna of the Miocene Bowden Marl of Jamaica; 

 Fossils from Walu Bay, Fiji; and Corals and Bottom Samples from Pago 

 Pago Harbor, by Thomas Wayland Vaughan. 



A report was published in the last Year Book of the Institution^ on the 

 investigations above enumerated, except the one on the Mollusca of the 

 Bowden marl of Jamaica, and what was said there need not be repeated. 



Mollusca of the Bowden marl of Jamaica. — Dr. W. P. Woodring, who is 

 making a monographic study of the Mollusca of the Bowden marl reports 

 that about 600 species of mollusks have been described and that the manu- 

 script will be completed early in 1924. During the past year more than 1,000 

 photographs to illustrate the monograph were made and retouched. The 

 descriptive part of the text is virtually complete, but the discussion of the 

 significance of the fauna is not yet finished. 



Fossils from Walu Bay, by W. C. Mansfield, with a brief article by T. W. 

 Vaughan on the Succession and probable Age of the Sedimentary Formations of 

 the Fijis. — Mr. Mansfield's manuscript is complete and the illustrations are 

 now being made. It is intended within a relatively short time to submit 

 this paper with proper illustrations for publication by the Institution. 



Corals from Pago Pago Harbor, Samoa. — Mr. J. Edward Hoffmeister has 

 completed the manuscript of his report of the corals collected in Pago Pago 

 Harbor by Dr. Alfred G. Mayor and it will be ready as soon as photographs 

 needed for illustrations have been made and assembled into plates. 



Bottom Samples from Pago Pago Harbor, Samoa. — Mr. M. N. Bramlette has 

 completed his descriptions of the bottom samples collected by Dr. Alfred G. 

 Mayor in Pago Pago Harbor and his report will be ready for submission as 

 soon as the results of some of the chemical analyses, made by L. G. Fairchild, 

 of the U. S. Geological Survey, have been incorporated. 



1 Year Book No. 21 for 1922, pp. 187-189. 



