iv CONTENTS. 
Page 
On the Embryogeny of the Rhizocephala, by Prof. C. Semper; On ° 
the Circulatory Apparatus of the Echinda, by M. E. Perrier; 
Embryology of the Ctenophora, by Alexander Agassiz; Notice 
of Papers on Embryology by A. Kowalevsky, by Alexander 
Agassiz ; On the Relationship of the Vertebrata and Annelida, by 
C. Semper; Segmental Organsin adult Selachia, by C.Semper. 83—95 
NUMBER LXXXVI. 
XIII. Zoologico-Embry ological Investigations. By M. Ussow.. 97 
XIV. On the Genus Rossedla (a Hexactinellid Sponge), with the 
Descriptions of three Species. By H. J. Carrer, F.RS. Xe. 
ENG. GSE aoe a cab odds Saou Us Ma OU ad ae omic Cs 113 
XV. Deseriptions of Species of Hippothoa and Alecto from the 
Lower Silurian Rocks of Ohio, with a Description of Aulopora 
arachnoidea, Hall. By H. AttEyne Nicuoxson, M.D., D.Se., 
F.R.S.E., Professor of Biology in the College of Physical Science, 
INeweastle-on-lyne. \( Plate px.) i cch-tee sock oanietete) olaleteesysiate sists 123 
XVI. Description of a supposed new Genus of Ceylon Batrachians. 
SY, WV ie BEER GUSON, WOW Ssciete e cios. les. Mee elalals ove ol sye coated reniieiage 128 
XVII. On the Genus Deidamia, y. W.-S. By James Woop- 
MASON, ‘of Queen's College, \Oxtord 25. aie een ve onic sen: eae 11 
XVIII. Notes on certain Genera of Agaristide, with Descriptions 
of new Species. By ARTHUR GARDINER Bur.LeR, F.L.S., F.Z5., &e. 
(Bllaite Xue ye aae evoke cine a orelomyern & wpa elte seers etn Ore ae eee eee 135 
XIX. Descriptions of new Species of Gobiide in the Collection of 
the British Museum. By A. W. E. O’Suavucunessy, Assistant in 
ine Natural-History Departments). 0.2. tc eee. seul en mine ene 144 
New Books :— Anon. The Excavation in the Kesslerloch near Thay- 
ingen.—Prof. Albert Heim. On a “Find,” of the Reindeer 
Period, in Switzerland.—H. Karsten. Studies of the Primeval 
History of Man in a Cave of the Schaffhausen Jura.—Recherches 
pour servir & l’Histoire Naturelle des Mammiféres, comprenant 
des Considérations sur la Classification de ces Animaux par M. 
H. Milne-Edwards, des Observations sur l'Hippopotame de 
Liberia et des Etudes sur la Faune de la Chine et du Thibet 
oriental par M. Alphonse Milne-Edwards .............. 148—152 
Proceedings of the Royal Societys. . (7muls0 4 lst es eee 153 
On some points in the Anatomy of the Common Mussel (Mytilus 
edulis), by M. A. Sabatier; Note on Herpeton tentaculatum ; 
Notice of some Freshwater and Terrestrial Rhizopods, by Prof. 
Leidy ; On Leucochloridium paradoxum and the Development of 
the Larvee contained in it into Distoma, by Dr. Ernst Zeller; 
The Diatomez of the Carboniferous Period, by Count F. Cas- 
ETACATIOM ee ars cine Stes ie ote eine Ghee eee he raieee 157—164 
NUMBER LXXXVI. 
XX. On Pelagonemertes Rollestoni. By H. N. Mose.ny, Naturalist 
on board EMS. “Challenger”? (Plate X22) scp Wiuiaw ct de oes 165 
