CONTENTS OF No. 174.-New Series. 



MEMOIRS : 



PAGE 



Tlie Development and Succession of Teeth in Hatteria punctata. 

 By H. Spencer Harrison, B.Sc.(Lond.), A, K.C.Sc, Demonstrator 

 and Assistant Lecturer in Biology, University College, CardiiF. 

 (From the Zoological Laboratory, Royal College of Science, London, 

 and University College, Cardiff.) (With Plates 10— 12) . . 161 



The Anatomy of Pleurotomaria Beyrichii, Hilg. By Martin E. 

 Woodward, Demonstrator of Zoology, Royal College of Science, 

 London. (With Plates 13— 16) .215 



Dolichorhynchus indicus, n. g., n. sp., a New Acraniate. By 

 Arthur Willey 269 



Heteropleuron hectori, the New Zealand Lancelet. By W. 

 Bi.AXLAND Benham, D.Sc, M.A., P.Z.S., Professor of Biology in 

 the University of Otago. (With Plate 17) 273 



On some Parasites found in Echinus csculentus, L. By Arthur 

 E. Shipley, M.A., Fellow and Tutor of Christ's College, Cam- 

 bridge, and Lecturer in the Advanced Morphology of the Inverte- 

 brata in the University. (With Plate 18) 281 



The Scottish Silurian Scorpion. By R. I. PococK. (With Plate 19) 291 



