CONTENTS OF No. 186.-New Series. 



MEMOIRS : 



PAGE 



On Peripatus guiauensis (sp, uov.). By Richard Evans, M.A., 

 D.Sc.(Oxon.), Curator of the Museum, Georgetown, British Guiana. 

 (With Plates 13 and 14) . . . ' 145 



Observations on Ovarian Ova and Follicles in Certain Teleosteau and 

 Elasmobranch Pishes. By William Wallace, B.Sc. (With 

 Plates 15 to 17) IGl 



A New Koeiienia from Texas. By Augusta Rucker, of the Uni- 

 versity of Texas, U.S.A. (With Plate 18) 215 



Oligotrema psammites : a New Ascidian belonging to the Family 

 Molgulidse. By Gilbert C. Boukne, D.Sc., F.L.S., Fellow and 

 Tutor of New College, Oxford ; University Lecturer in Comparative 

 Anatomy. (With Plates 19 to 23) 233 



