In 1864 an anonymous list of species of the West Indian marine mollusks was published in Denmark. There were only twenty copies printed, seven of which were lost during transportation to the West Indies (CLENCH et al., 1947—1948, p. 23). The author was HENDRIK JOHANNES KREBS (1821—1907), Fig. 117, a Danish apothecary who lived on St. Thomas, Virgin Islands, from 1843 to 1870. Being the owner of a wholesale firm, he travelled throughout the West Indies, which gave him an opportunity to collect shells and plants. His species list was entitled: “The West-Indian Marine Shells with some remarks. A manuscript printed for circulation between collectors.” It was published by W. Laub’s Widow & Chr. Jorgensen, at Nykjöbing, Falster. As this work is very rare, a republication was issued by CLENCH, AGUAYO & TURNER (1947—1948). The republication is preceded by some remarks, and concludes with a portrait of KREBS, a biography and a bibliography. For more data concerning KREBS, reference should be made to this republication.