CONTENTS. V 



Page 



XVIII. On the Mexican Species of Hydropori. By the Rev. 

 Hamlet Clark, M.A., F.L.S 173 



XIX. Descriptions of Indian and Burmese Species of the Genus 

 Unio, Retz. By W. H. Benson, Esq 184 



XX. Notes on some Chinese Condiments obtained from the Xari' 

 thoxylacece. By W. F. Daniell, M.D., F.L.S. , Staff-Surgeon, 

 Army Medical Staff. (Plate V.) 195 



XXI. On some additional Species that are common to Carboniferous 

 and Permian Strata; with Remarks on the Recurrency of Carboni- 

 ferous Species. By James W. Kirkby. (Plate IV.) 202 



XXII. On Synapta digitata and its supposed Parasite. By A. 

 Baur 216 



XXIII. On the Discovery of Ancient Remains of Emys lutaria in 

 Norfolk. By Alfred Newton, M.A., F.L.S. (Plates VI. & VII.) 224 



Proceedings of the Zoological Society 228-239 



On the Hyracotherian Character of the Lower Molars of the supposed 

 Macacus from the Eocene Sand of Kyson, Suffolk, by Prof. Owen ; 

 On a new British Mygale 240 



NUMBER LVIII. 



XXIV. Contributions to the Natural History of the Infusoria. By 



T. W. Engelmann. (Plate III.) 241 



XXV. Descriptions of a new Genus and some new Species of Naked 

 Mollusca. By Joshua Alder and Albany Hancock, F.L.S. ... 261 



XXVI. A Synopsis of the Species of Crocodiles. By Dr. J. E. 

 Gray, F.R.S. &c 265 



XXVII. Notes on rare and little-known Fishes taken at Madeira. 



By James Yate Johnson, Cor. Mem. Z.S 274 



XXVIII. On Additions to the Madeiran Coleoptera. By T. Ver- 

 non Wollaston, M.A., F.L.S 287 



XXIX. On the Animal and Affinities of the Genus Alaba; with a 

 Review of the known Species, and Descriptions of some new Species. 



By Arthur Adams, F.L.S. &c 293 



XXX. On an apparently undescribed Spider from Cochin China. 



By Dr. Albert Gunther. (Plate VIII. fig. A.) 299 



XXXI. Some Remarks on the Genus Trachinus. By Dr. Albert 

 Gunther. (Plate VIII. tigs. B, C. D.) .". 301 



