PLATE IV. 



Fig. 



48 Turbo Bidens Two-toothed Turbo. 



49 Turbo Petholatus Ribband Turbo. 



50 Nerita Virginea Guinea-hen Nerite. 



51 Nerita Plicata Plaited Nerite. 



52 Haliotis Tuberculata • - • Common Ear Shell. 



53 Haliotis Asinina Ass's-ear Shell. 



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



55 Patella Perforata Perforated Limpet. 



56 Patella Vulgata Common Limpet. 



57 Patella Fissura Cracked Limpet. 



58 Patella Sinensis Chinese-bonnet Limpet. 



59 Patella Equestris Cup-and-saucer Limpet. 



60 Dentalium Striatum Striated Tooth Shell. 



61 Serpula Aquaria Watering-pot Serpula. 



62 Teredo Navalis Common Ship Worm. 



63 Sabella Belgica Granulated Sabella. 



