September 29. Price 3s. 



THE JOURNAL 



OE 



THE LINNEAN SOCIETY. 



Vol. XY. ZOOLOGY. nZs6. 



CONTENTS. 



Page 



I. On the Land-Molluscan Grenus Durgella, W. T. Blan- 

 ford ; with Notes on its Anatomy and Description of 

 a new Species. By Lieut. -Colonel H. H. Godwin- 



Attsten, F.E.S., F.L.S. (Plates XX. & XXL) 291 



II. Observations on the Life-histories of Gamasince, with 

 a view to assist in more exact Classification. By 

 Albert D. Michael, F.L.S., F.E.M.S. (Plates 

 XXII. & XXIII.) 297 



III. Observations on some British Fishes. By Francis 



Day, F.L.S 310 



IV. On the Apparent Eetention of a Sur-anal Plate by a 



young JScMnometra. By F. Jeffrey Bell, M.A. 

 (Communicated by Dr. J. MuRrE, F.L.S.) (With a 

 woodcut.) 318 



V. On a Lithistid Sponge and on a Form of Aphrocallistes 

 from the Deep Sea off the Coast of Spain. By Prof. 

 P. Martin Duncan, M.B. Lonci., F.E.S., F.L.S., &c. 



(Plates XXIV. & XXV.) 320 



VI. On Individual Variation in the Branchial Sac of Simple 

 Ascidians. By W. A. Herdman, D.Sc, F.L.S., 

 F.B.S.E 329 



LONDON: 



SOLD AT THE SOCIETY'S APAKTMENTS, BUKLINGTON HOUSE, 



AND BY 



LONGMANS, GEEEN, EEADEE, AND DTEE, 



AND 



WILLIAMS AND NOEGATE. 



1881. 



