Figures 30–34.Acritoptila larvae and cases. 30–31 Acritoptila disjuncta Kelley larva in sponge-covered case and larva removed from case, lateral view 32–33 Acritoptila crinita Kelley larva in case of secretion and (32a) embedded diatoms and larva removed from case, lateral view 34 Acritoptila amphapsis Kelley pupa in damaged sand grain case. Scale bars: 30, 32 = 0.5 mm; 31, 33, 34 = 1.0 mm.