World Polychaeta Database (WPolyDb)
First issue of volume 20 dated '1869', not '1870' (see
BHL); confusion concerning the publication date of Claparède’s taxa might be due to the fact that the first issue of volume 20 (which includes Claparède's paper and is dated 1869) is bound together with the second issue (dated 1870), with year 1870 being cited on the title page as the publication date of the whole volume.