CONTENTS. V 



Page 



XXIV. On a Melobesiau Form of Foraminifera {Gypsina mehbe- 

 siotdes, mihi) ; and further Observations on Carpenteria monticularis. 



By H. J. Carter, F.R.S. &c 172 



XXV. On a Fossil Species of Sarcohexactinellid Sponge allied to 

 Hynlonema. By H. J. Carter, F.R.S. &c 176 



XXVI. Description of a new Species of Batrachostomus from 

 Central Borneo. By Dr. F. Bbuggemann 178 



XXVII. On the Distribution of Birds in North Russia.— Part III. 

 On the Longitudinal Distribution of the Birds of the Southern 

 DiviSiox (between 64^° X. and o8°-60° X.), and a Comparison of the 

 Faunas of the two Divi.sioxs ; with Summaries. By J. A. Har\'IE 

 Brown, F.Z.S., Member of the British Ornithologists' Union 180 



XXVIII. On British Polyzoa.— Part I. By the Rev. Thomas 

 IIiNCKS, B.A., F.R.S .212 



XXIX. X^ote on the Radical Fibres of the Polyzoa. Bvthe Rev. 

 Thomas Hincks, B.A., F.R.S ' 218 



XXX. On a new Genus of Hydroids from the TMiite Sea, with a 

 short Description of other new Hydroids. By C. Mereschkowsky. 

 (Plates V. & VI.) 220 



XXXI. The Post-tertiaiy Fossils procured in the late Arctic 

 Expedition ; with Notes on some of the Recent or Living MoUasca 

 from the same Expedition. By J. GwYX Jeffreys, LL.D., F.R.S. 229 



XXXII. Description of a new Species of Helix. By Edgar A. 

 SsuTH, Zoological Department, British Museum 242 



On the Structure of the Lower Jaw in Rhizodopsis and Rkizodtts, by 

 Dr. R. H. Traquau- ; Note on the Genus Poeoptera, by Dr. F. 

 Briigoremann 244 



^DD^ 



NUMBER CXVIII. 



XXXIII. On the Sak>nd(p, Wright.— Part II. Observations on 

 the Morphologv of Recent Salenite, and Description of a new Species. 



By P. Martin" Duncan, F.R.S., Pres. Geol. Soc. (Plate VIl.) .. 24o 



XXXIV. Studies on Fossil Sponges. — I. Ilexactinellida. By 

 Karl Alfred Zittel 257 



XXXV. On some new and little-known Spiders from the Arctic 

 Regions. Bv the Rev. O. P. Cambridge, M.A., C.M.Z.S., &c. 

 (Plate VIII.) 273 



XXXVI. On the Changes produced in the Siliceous Skeletons of 

 certain Sponges by the Action of Caustic Potash. By \V. J. Sollas, 

 M.A., F.(4.S., formerly Scholar of St. John's College, Cambridge. 

 (Plate IX.) 285 



XXXVII. Notes on Stony Corals in the Collection of the British 

 Museum. By Dr. F. Bruggemann HOO 



XXXVIII. On liellidia Hiintii, a Genus and Species of Crustacea 

 supposed to be new. By Philip Hknrv Gosse, F.R.S. (Plato X.) '.ili^ 



