IREDALE : MOLLUSCAN NOMBNCLATURAL PROBLEMS. II. 203 



to nineteenth livraisons, and the following items stand out. 

 Livraisons 4 and 5 were published at Bordeaux at the Imprimerie 

 G. Gounouilhou, 11 Rue Guiraude, and are dated 1868. Then the 

 place of publication was changed to Paris, as given above, and 

 livraisons 6 and 7 came out in one cover, also dated 1868. On the 

 back of the cover is now printed : " Conditions de la Souscription. 

 France : 1 fr. 50 la livraison ; Etranger : suivant les tarifs postaux. 

 On souscrit pour cinq livraisons payables d'avance. Vingt livraisons 

 forment un volume contenant environ trente planches." Livraisons 

 8, 9, 10, 11 came out separately, each dated 1869. Then 12 and 13 

 came out in one cover, and 14, 15, 16 separately, each dated 1870. 

 Livraison 16 is curious, as the pages are headed 239-54, whereas 

 they should be 241-56, and apparently a corrected livraison was issued, 

 since in the bound work the lettering is corrected. Livraison 17 

 is dated 1871, and livraisons 18 and 19 appeared separately dated 

 1872. These prove the title page dates to be incorrect, and all the 

 dates given in the text are simply MS. dates, and have nothing to do 

 with publication. Apparently the first volume did appear in 

 livraisons of 16 pages each, but it will be noted that twice two 

 appeared together. The cover only of the third livraison is of the 

 Bordeaux print, and is dated 1867. 



Nearly 200 new species are described in the work. 



Megerle's MSS. Genera. 

 In the Nomenclator Zoologicus by S. H. Scudder, published as 

 Bulletin U.S. Nat. Mus., No! 19, 1882, there is a pitfall for the 

 systematist I have not seen emphasized. In the preface to part i 

 is written (p. vi) " It is a special pleasure to acknowledge my 

 indebtedness to Mr. Alexander Agassiz, who freely placed at my 

 disposal the manuscript additions and corrections which 

 Professor Agassiz had made to his Nomenclafcor," and (p. xviii) 

 " the name Agassiz is appended to all entries copied from his 

 manuscript additions to the Nomenclator of 1846 ". Among such 

 entries is a long series of generic names, copied from a MS. of Megerle, 

 and to most of these an equivalent is cited. I have gone through 

 the Nomenclator and extracted all these names, and here give a 

 list, though on account of the difficulty it may not be complete. I 

 give them in alphabetical order for ease of reference. 



