LIST OF PAPERS. 



Duncan, Prof. P. Martin, M.B. (Lond.), F.K.S., F.L.S., &c. 



A Revision of the Genera and great Groups of the Echinoidea . 1 



GuLicK, Rev. John Thomas. 



Intensive Segregation,or Divergence through Independent Trans- 

 formation. (Communicated by W. Percy Sladen, Sec. L.S.) . 312 



Hebdman, W. A., D.Sc, F.L.S., Professor of Natural History in 

 University College, Liverpool. 

 A Revised Classification of the Tunicata, with Definitions of the 

 Orders, Suborders, Families, Subfamilies, and Genera, and 

 Analytical Keys to the Species 558 



Howes, G. B., F.L.S., F.Z.S., Assistant Professor of Zoology, Normal 

 School of Science and Royal School of Mines, S. Kensington. 

 On the Intestinal Canal of the Ichthyopsida, with especial 

 reference to its Arterial Supply and the Appendix Digiti- 

 formis. (Plates I. & II.) 381 



On some Hermaphrodite Genitalia of the Codfish {Gadus mor- 

 rhud), with Remarks upon the Morphology and Phylogeny 

 of the Vertebrate Reproductive System (Plate XIV.) .... 539 



Jenning-s, a. Vaughan, F.L.S., F.G.S., Lecturer on Comparative 

 Anatomy to the Birkbeck Institute. 



On a Variety of Alectona Millari, Carter. (Plate XIIL) ...... 531 



