l''EB-R:ITAT?.Y 25. 



THE JOUR 



OF 



THE LINNEAN SOCIETY 



Vol. XII. 



ZOOLOGY. 



Nos. 60-62. 



CONTENTS. 



I. Diagnoses! of uew Genera and Species of Hydroida. By 

 Professor Allman, M.D., LL.D., E.E.S., Pres. L.S. 

 &c. (Plates IX.-XXIII.) '. 251 



II. On the supposed Earity, Nomenclature, Structure, Affi- 

 nities, and Source of the large human Fluke {Distoma 

 crassum, Busk). By T. Spencer Cobbold, M.D., 

 E.E.S., E.L.S., Lecturer on Parasitic Diseases 285 



III. Similitudes of the Bones in the Enaliosauria. By Harry 



GrOYiEB Seelet, Esq., F.L.S., E.Gr.S., Professor of 

 Physical Greography in Bedford College, London 296 



IV. The Anatomy of two Parasitic Forms of the Family 



Tetrarliynchidse. By Francis H. Welch, F.E.C.S., 

 Surgeon, Army Medical Department, and Assistant 

 Professor of Pathology, Array Medical School, Netley. 

 Communicated by Professor Busk, V.P.L.S, (Plates 

 XXIV.-XXVL) 329 



Y. Notes on tlie Lepidoptera of the Family Zygsenidas, with 

 Descriptions of new G-enera and Species. By Artutjr 

 G. Butler, F.L.S., F.Z.S. (Plates XXVII. and 

 XXVIIL) 342 



LONDON: 

 SOLD AT THE SOCIETY'S APARTMENTS, BUELINGTON HOUSE 



AND BY 



LONGMANS, GEEEN, EEADEE, AND DTEE, 



AND 



AVILLIAMS AND NOEGATE. 



1876. 



