PREFACE. 



THE Catalogue of Testaceous Mollusca was prepared 

 from the Manuscript Catalogue of my own collection, 

 with several additions from William Thompson's Fauna 

 (chiefly of land and fresh water shells) made by R. Ball, 

 of Dublin and Sisters, Rev. T. Hincks, Dr. Allman, &c. 

 For the list of the Crustacea and Echinodermata, I am 

 indebted, almost wholly, to William Thompson's report 

 of the Fauna of Ireland not having myself had oppor- 

 tunities to collect or arrange them ; and I take this 

 method of returning him my best acknowledgements for 

 the promptitude with which he furnished me with every 

 information in his power. 



Many additions, I doubt not, may yet be made to this 

 Catalogue, and I shall be much gratified in seeing it 

 increased by the assiduity of my brother collectors. 



J. D. H. 



