

CONTENTS OF PAKT III. 



PAGE 



15. Orthogenetic variation in the shells of Chelonia . . . 207 



By II AXS GADOW, M.A., Ph.D., E.R.S. 



With Plates XXIV. ami XXV. and one text-figure. 



1G. Enteropneusta from the South Pacific, with notes on the West 



Indian Species ......... 223 



By ARTHUR WILLEY, D.Sc. (Hon. M.A. Cantab.). 

 With Plates XXVI. — XXXII. and seven text-figures. 



17. On a collection of Echiurids from the Loyalty Islands, New 

 Britain and China Straits, with an attempt to revise the 

 group and to determine its geographical range . . . 335 



By ARTHUR E. SHIPLEY, M.A. 

 With Plate XXXIII. 



