CONTENTS. 
I. — Report on the Rteropoda collected by H.M.S. Challenger during the years 
1873-1876. Part II. — The Thecosomata. 
By Paul Pelseneer, D.Sc. (Brussels). 
( The Manuscript was received 2nd August 1887.) 
II. — Report on the Pteropoda collected by H.M.S. Challenger during the years 
1873-1876. Part III. — Anatomy. 
By Paul Pelseneer, D.Sc. (Brussels). 
( The Manuscript was received 5th December 1887.) 
HI. — Report on the Hydroida dredged by H.M.S. Challenger during the years 
1873-1876. Part II. — The Tubularhsle, Corymorphhsle, Campanularhsle, 
SERTULARiNiE, and Thalamophora. 
By Professor G. J. Allman, M.D., LL.D., F.R.C.S.I., F.R.SS. L. & E., 
M.R.I.A., C.M.Z.S., Mem. Roy. Danish Acad. Sci., &c. 
( The Manuscript ivas received in Instalments between 29 th August 1887 
and 9th February 1888.) 
XY. Report on the Entozoa collected by H.M.S. Challenger during the years 
1873-1876. 
By Dr. 0. von Linstow of Gottingen. 
( The Manuscript was received 2kth October 1887.) 
y Report on the IIeteropoda collected by H.M.S. Challenger during the years 
1873-1876. 
By Edgar A. Smith, F.Z.S., Assistant in the Zoological Department of 
the British Museum. 
( The Manuscript was received 21 st January 1888.) 
