456 



INDEX TO VOL. XX. 



Alestes, new species of, 113, 



Ambassis, new species of, 67. 



Amblyopus, new species of, 79. 



Ampbidecta, description of the new 

 genus, 404. 



Ain])bioxus, on the anatomy and 

 ]ihysiology of, 302, 



Animal meclianics, on some elemen- 

 tary i)riucii)les in, 294. 



Annelida, on the structure of the, 337. 



Antitaxis, observations on the genus, 

 12. 



Apate, observations on the genus, 

 with descriptions of new species, 

 83. 



Aphis of the maple, on the develop- 

 ment of the, 149. 



Apocryptes, new species of, 117. 



Apogon, new s])ecies of, 58. 



Argonauta, on the species of, 103. 



Aristega, observations on the genus, 



Arthonia, new British species of, 256. 



Aspergilkis, on two new parasitic 

 forms of, 385. 



Assiminea Fi-ancesise, note on, 71 . 



Asterosmilia, observations on the ge- 

 nus, 127. 



Ateles, new species of, 300. 



Atberina, new species of, 64. 



Athyris, on the classification of the 

 subdivisions of M'Coy's genus,233. 



Augyles, characters of the new ge- 

 nus, 41. 



Axolotl, on the regeneration of the 

 limbs in the, 149, 446. 



Balaenoptera rostrata, on the anatomy 

 of, 299. 



Balanoglossus, on the anatomy of, 

 230. 



Balbiani, M., on the development of 

 the brown Aphis of the ma[)le, 149. 



Bargus, characters of the new genus, 

 34, 



Battersbyia, observations on the ge- 

 nus, 127. 



Bert, P., on the anatomy and phy- 

 siology of Amphioxus, 302. 



Billings, E., on the classification of 



the subdivisions of M'Coy' s genus 

 Athyris, 233. 



Birds, new, 269. 



Blackwall, J., on new species of Spi- 

 ders, 202. 



Bledius, observations on thegenus,30, 



Bocage, J. V. Barboza du, on Hyalo- 

 nema lusitanicum, 123; on two 

 new Saurians, 225, 



Books, new : — Clarke's List of Flow- 

 ering Plants, Ferns, &c., collected 

 in the neighbourhood of Andover, 

 73; Key's Flora of Devon and 

 Cornwall, i6.; Jenyns's Bath Flora, 

 ih. ; Trimmer's Flora of Norfolk, 

 ih.; Gwyn Jeffreys's British Con- 

 chology. Vol. IV., 378 ; James- 

 Clark's Mind in Nature, 381 ; 

 Hamlet Clark's Letters Home, 443. 



Bostrichus, new species of, 88. 



Butler, A. G., on some new genera 

 and species of diurnal Lepidoptera, 

 216; on a new species of Tiger- 

 moth, 218; on the Lepidopterous 

 insects hitherto included in the ge- 

 nus Pronophila, 266 ; on new or 

 little-known Asiatic Lejjidoptera, 

 39.9 ; on a new genus of American 

 Satyridae, 404, 



Cadulus, new British species of, 251, 



Callerebia, description of the new ge- 

 nus, 217. 



Campodeae, observations on the, 361, 



Carpenter, Dr. W. B., on the shell- 

 structure of Spirifer cuspidatus, 68; 

 on the structure and affinities of 

 Eozoon Canadense, 134. 



Carte, Dr. A., on the anatomy of 

 Balajnoptera rostrata, 299. 



Cervus megaceros, notes on, 77, 152, 

 301. 



Charaxes, new species of, 400. 



Cheilopoma, description of the new 

 genus, 20. 



Chiroleptes, new species of, 54. 



Claparede, E., on the structure of the 

 AnnelidfE, 337. 



Clarias, new species of. 111. 



Clerorae, new species of, 401. 



