CONTENTS 



CONTENTS OF No. CXXXIII, N.S., AUGUST, 1892. 

 MEMOIRS : 



PAGE 



The Anatomy of Pentastomum teretiusculum (Baird). By 

 W. Baldwin Spencer, M.A., Professor of Biology in the Uni- 

 versity of Melbourne. (With Plates I— IX) ... 1 



On the Minute Structure of the Gills of Palsemonetes varians. 

 By Edgar J. Allen, B.Sc., University College, London. (With 

 Plate X) 75 



CONTENTS OF No. CXXXIV, N.S., NOVEMBER, 1892. 



MEMOIRS : 



On the Development of the Optic Nerve of Vertebrates, and the 

 Choroidal Fissure of Embryonic Life. By Richard Assheton, 

 M.A., Demonstrator of Zoology in the Owens College. (With 

 Plates XI & XII) 85 



The Larva of Asterias vulgaris. By George W. Field, M.A. 

 (With Plates XIII, XIV & XV) . . . .105 



The Development of the Genital Organs, Ovoid Gland, Axial and 

 Aboral Sinuses in Amphiura squamata; together with some 

 remarks on Ludwig's Haemal System in this Ophiurid. By E. 

 W. MacBride, B.A., B.Sc, Scholar of St. John's College, Cam- 

 bridge. (With Plates XVI, XVII & XVIII) . . .129 



A New English Genus of Aquatic Oligochseta (Sparganophilus) 

 belonging to the Family Rhinodrilidse. By W. B. Benham, 

 D.Sc.Lond., Aldrichian Demonstrator of Anatomy, Oxford. 

 (With Plates XIX & XX) 155 



