CONTENTS. V 



Page 



XXIV. On a Melobesian Form of Foraminifera {Gypnina melobe- 

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



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



XXV. On a Fossil Species of Sarcoliexactinellid Sponge allied to 

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



XXVI. Description of a new Specie.^ of Batrachostomits from 

 Central Borneo. By Dr. F. Bruggemann 178 



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

 On the Longitudinal Distribution of the Birds of the Southern 

 Dnisiox (between (U^^ N. and o.s°-60° N.), and a Comparison of the 

 Faunas of the two Divisions ; with Summaries. By J. A. Harvie 

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



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

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



XXIX. Note on the Radical Fibre? of the Polyzoa. Bvthe Rev. 

 Thomas Hincks, B.A., P'.R.S " 218 



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

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

 (Plates V. & VI.) 2:iO 



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

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

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



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

 Smith, Zoological Department, British Museum 2-12 



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

 Dr. R. H. Traquair ; Note on the Genus Rceoptera, by Dr. F. 

 Briigo-emann 244 



■'DO"- 



NUMBER CXVIIL 



XXXIII. On the Scdenidce, Wright. — Part II. Observations on 

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



By P. Martin" Duncan, F.R.S., Pres. Geol. Soc. (Plate VII.) .. 245 



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

 Karl Alfred Zittel 257 



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

 Regions. Bv the Rev. 0. P. Cambridge, M.A., C.M.Z.S., &c. 

 (Plate VIII.) 273 



XXXVI. On the Changes produced in the Siliceous Skeletons of 

 certain Sp(/nges by the Action of Caustic Potash. By W. J. Sollas, 

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

 (Plate IX.) 285 



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

 jMuseum. By Dr. F. Bruggemann .300 



XXXVIII. On Bellidin Hvntii, a Genus and Species of Crustacea 

 supposed to be new. By Philip Henry Gosse, F.R.S. (Plate X.) 313 



