PLATE IV, 



Fig, 



48 Turbo Bidens Two-tootlied Turbo. 



49 Turbo Petholatus Ribband Turbo. 



50 Nerita Virgiuea Guinea-lien Nerite. 



5 1 Nerita Plicata Plaited Limpet. 



52 Ilaliotis Tuberculata • • • Common Ear Shell. 



53 Haliotis Asinum Ass's Ear Shell. 



54 Haliotis Tuberculata • • • Outside view of fig. 52. 



55 Patella Perforata Perforated, or Key Hole 



Limpet. 



56 Patella Vulgata Common Limpet. 



57 Patella Fissura Cracked Limpet. 



58 Patella Chinensis Chinese-bonnet Limpet. 



59 Patella Equestris Ciip-&-saucer Limpet. 



60 Dentalium Striatnlum •• Striated Tooth Shell. 



61 Serpula Aquaria Watering-pot Serpula. 



62 Teredo Navalis Common Ship Worm. 



63 Sabella Bclgica Granulated Sabella. 



