Books

van der Spoel, S., 1967. Euthecosomata, a group with remarkable developmental stages (Gastropoda, Pteropoda). J. Noorduijn en Zoon N.V., Gorinchem, 6 Dec 1967: 1-375, 366 figs.. ≡

van der Spoel, S., 1976. Pseudothecosomata, Gymnosomata and Heteropoda (Gastropoda). Bohn, Scheltema & Holkema, Utrecht, [1 Jan] 1976: 484 pp., 246 figs.. ≡

Articles

van der Spoel, S., 1972. A taxonomical outline of the Gymnosomata (Mollusca). Basteria 36 (2/5), 19 Dec 1972: 75-88. ≡

van der Spoel, S., 1973. Pneumodermopsis teschi n. sp., and Notes on Some Other Pteropoda of the "Thor" Expeditions 1903-1910 (Gastropoda). Bull. Zool. Mus. Amsterdam 3 (9), 4 Jul 1973: 53-64. ≡