CONTENTS 



I 



PAGE 



ON A HITHERTO UNDESCRIBED STRUCTURE IN THE HUMAN HAIR SHEATH . I 



London Medical Gazette, vol. i. p. 1340, _////)', 1S45. 



II 

 EXAMINATION OF THE CORPUSCLES OF THE BLOOD OF AMPHIOXUS LANCEO- 



LATUS , . -4 



British Association Report, 1847, pt. ii. p. 95. 



Ill 



DESCRIPTION OF THE ANIMAL OF TRIGONIA, FROM ACTUAL DISSECTION 6 



Proceedings of the Zoological Society, vol. xvii. 1849. PP- 30-32, also in 

 Annals and Magazine of Natural History, vol. v. 1850,//. 141-143, 



IV 



ON THE ANATOMY AND THE AFFINITIES OF THE FAMILY OF THE MEDUSA 9 



Philosophical Transactions of the Royal Society, iS/^g, pt. ii. p. 413. 



V 



NOTES ON MEDUSjE AND POLYPES ... • ■ ■ 33 



Annals and Magazine of Natural Mistory, vol. vi. iS^o, pp. 66-67. 



VI 



OBSERVATIONS SUR LA CIRCULATION DU SANG CHEZ LKS MOLLUSQUES DES 



GENRES FIROLE ET ATLANTE . . . .... 36 



Extraites d'une lettre adressee cL M. Milne-Edwards 

 Annates des Sciences Nattirelles, vol. xiv. iS^o, pp. 193-5. 



VII 



OBSERVATIONS UPON THE ANATOMY AND PHYSIOLOGY OF SALPA AND 



PYROSOMA • • . . 38 



Philosophical Transactions of the Royal Society, 1851, pt. ii. pp. 567-594 ; 

 also in Annals and Magazine of Natural History, vol. ix. 1852, 

 pp. 242-244. 



