548 



INDEX. 



Tlu-acia, new species of, 490. 

 Thwaites, G. H. K., ou lichens and 



their development, 386. 

 Torpedo, on the termination of the 



nerves in the electrical apparatus 



of the, 448. 

 Toulminia, characters of the new 



genus, 512. 

 Trabala, new species of, 480. 

 Traquair, Dr. R. H., on the sti'uctm'e 



of the lower jaw in Rhizodopsis 



and Rhizodus, 244. 

 Tremabolites, characters of the new 



genus, 511. 

 Tremadictyon, characters of the new 



genus, 502. 

 Trichotropis, new species of, 135. 

 Triphleps, new species of. 111. 

 Triptogon, new species of, .393. 

 Trochobolus, characters of the genus, 



506. 

 Tropsea, new species of, 480. 

 Turdinus, new species of, 519. 



Tweeddale, Ai-thur, Marquis of, on 

 new species of birds, 94, 533. 



Yalkeria, new species of, 215. 



Vavssiere, A., on a new genus of 

 Tritoniidse, 367. 



Waterhouse, C. O., on a new genus 

 of Cicindelidae, 424. 



Whale, new species of, 329. 



White, Dr. F. B., on new species of 

 Heteropterous Hemiptera, 110. 



W^ollaston, T. V., on a new insect 

 pest at Madeira, 334. 



Wood-Mason, J., on some new Or- 

 thopterous insects, 74, 130. 



WyviUethomsonia W^allichii, obser- 

 vations on, 337. 



Young, Prof. J. and J., on a Carbo- 

 niferous Hyalonema and other 

 sponges, 425. 



Zenzera, new species of, 348. 



Zittel, K. A., on fossil Hexactinel- 

 lida, 257, 405, 501. 



Zygsena, new species of, 393. 



\ 



( 



END OF THE TWENTIETH VOLUMK 



PRINTED BT TAYLOR AND FRANCIS, 

 SED MON COURT, FLEET STREET. 



