Aplysiida types. A–E. Holotype of Tethys willcoxi var. perviridis (=A. perviridis), A. Whole specimen, L. ca 105 mm, ANSP A2250 in right lateral view. B. Same, detail of opaline gland in dorsal view showing the uniporous and multiparous apertures. C. Same, opaline deflected showing the opaline gland spread on the roof of haemocoel. D. Shell of the same, L 60 mm, in ventral view. E. Same in dorsal view. F–H. Syntype of Tethys pilsbryi (= A. pilsbryi). F. Whole specimen, L 97 mm, ANSP A7036 in right lateral view. G. Same in dorsal view. H. Same, detail of pallial cavity showing the upturned edge to the rim of the mantle border (ed); legend: pa - parapodium, sr - seminal groove, ha - hermaphrodite aperture, ed - upturned edge, ma - mantle; gi - gill, as - anal siphon. Scale bar: 5 mm.