PKEFACE. 



In these pages I have recorded the papers relating to recent 

 and fossil Mollusca in the following periodicals : 



(1) ' Magazine of Natural History,' vols, i-ix (1829-1836), 

 and new series vols, i-iv (1837-1840), referred to as Mag. Nat. 

 Hist, and Mag. Nat. Hist. n. s. The Supplemental plates were 

 issued in four parts, namely : 



No. 1, May 1839, pis. i-iv. 

 No. 2, Sept. 1839, pis. v-ix. 

 No. 3, April 1840, pis. x-xiv. 

 No. 4, July 1840, pis. xv-xix. 

 The last plate is lettered xx, but appears to be really xix. 



(2) 'Magazine of Zoology and Botany,' vols, i and ii (1836- 

 1838), referred to as Mag. Zool. Bot. The dates of issue of 

 these twelve parts are troublesome. As nearly as I can trace 

 them they are as below : 



Pt. 1 June 1836 Pt. 7| 



„ 2 Aug. 1836 „ 8 [ previous to Oct. 1837 



1836 



Jan. and Feb. 1837 



„ 0( 



„ 6) 



I have to thank Mr Sherborn and Mr Woodward for their 

 kind help. 



(3) 'Annals of Natural History,' vols, i-v (188.8-1840), 

 which became, by union, in vol. vi * The Annals and Magazine 

 of Natural History,' and is cited throughout these pages, for 

 brevity, without any abbreviated title. Series 2, volume vii, 

 for example, is referred to as (2) vii. 



The date of 1863 has been selected as a convenient stopping- 

 place, since after that year the periodical has been dealt with 

 in the pages of the ' Zoological Record,' whose system has been 

 here followed. I have appended to each paper, in square 

 brackets, the date of its publication. 



Attention is called to the Errata on p. vi, relating to No. I. 

 of the Digesta. 



