In the preceding article a systematic study has been made of the Dutch Spisula ’s. The following are the main conclusions: 1. Though in the majority of cases very well recognizable at first sight, the habitus alone can not be used for identification of the species. The following characters, however, proved to be diagnostic: (a) the presence or absence of the fan-shaped groove-pattern on the dorsal slopes (the “lunula” and “area”), (b) the length of the V-shaped cardinal tooth in the left valve, (c) the relative breadth of the cartilage-pit, while (d) the length and shape of the pallial sinus, though more or less variable, proved to be very useful. In addition other characters, such as the ribs in Sp. triangulata, the shape of the anterior muscular scar in Sp. subtruncata, etc. have been used. 2. Spisula elliptica (Brown), regarded by most authors as a mere variety of Sp. solida (L.), is nevertheles a very distinct species, its habitat extending from the North Atlantic through the North Sea into the Channel. 3. Spisula ovalis (J. Sowerby) is a synonym of Sp. solida (L.); shells identified as Sp. oralis, however, often belong to Sp. elliptica (Brown). 4. The great variety in shape of Spisula subtruncata (Da C.) has lead to the establishment of many species, especially in older malacological works, which nearly all turned out to be some form of Sp. subtruncata. 5. Spisula triangulata (S. V. Wood) is exclusively a fossil species and not identical with Sp. triangula (Brocchi), since this is a form or variety of Sp. subtruncata. In palaeontological works, however, the name triangula has been used erroneously to indicate the true Sp. triangulata. 6. Since TURTON’s Mactra deaurata refers to a N.E.-American Mesodesma, it was necessary to find another name for our fossil “Spisula deaurata”, the earliest traceable one being Sp. inaequilatera (Nyst).