CONTENTS OF VOL. VI. 



A Generai; Notice of the Biological Memoirs . . . • (p- vii.) 



Synopsis of the Contents of the Several Volumes of Memoirs. . (p. xi.) 

 Classified Summary of the Contents of Vols. I-VI . . ■ (p- xiii.) 



ECHINODERMA. 



III. — On a Collection of Young Holothurioids. By Prof. E. W. 



MaoBride, D.Sc, LL.D., F.R.S (9 pp., 2 Pis.) 



POLYCH^TA. 



By E. Ehlers, Professor in Gottingen . . (32 pp., 3 Pis.) 



FEESHWATEE ALGiE. 

 By F. E. Fritsch, D.Sc, Ph.D., F.L.S. . . (GO pp., 3 Pis.) 



