CONTENTS OF VOL. VI. 



A (OvSKIlAI, XoTK'K (IF THK BluLotilCAL MuMdlllS . . ([I. vii.) 



SVNOI'.-IS OK THK CONTENTS OF THK SEVERAL You MKs OF MKMolK>. . (p. xi.) 



( 'L\SSIFIKI> SKMMARY OF THK CONTKNTS OF YOLS. I \"l . . (p. xiii.) 



ECHINODERMA. 



III. Ox A COLLECTION OF YOUNG HOLOTHURIOIDS. By PROF. E. "NY. 



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



POLYCILETA. 



By E. EHLEKS, PROFESSOR IN GOTTIX<;K.V . . (32 pp., 3 I Ms.) 



FRESHWATER ALGJv 

 By F. E. FRITSCH, D.Sc., PH.D., F.L.S. . (GO pp., 3 Pis.) 



2 



