INDEX 



155 



Progression, mode of, 1 15 



Prolecanites Henslowi, xxii. 



Proneomenia Sluiteri, ix. 



Proostracum, 40 



Propodium, 116 



Prosobranchia, 23 



Prosogyre, 30 



Protective coloration, ng-121 



Protobranchia, 34 



Protoconch, 19, 94 



Psammobia, 108 



Psammobia squamosa, xix. 



Psammobia vespertina, xv. 



Pseudomilax, 106 



Psyche globulosa, xxvi. 



Pima, 9, 74, 132, 133 



Pteria hirundo, xvii. 



Pteriidae, 109 



PUrocera, 63, 97, 104, 117 



Pterocera lambis, v. 



Pteropoda (Sea-Butterflies), 56, 



105, 117, 132 

 Pulmonata, 10, 25, 126, 130 

 Puncturella noachina, ix. 

 Pupidse = Pupillidae 

 Pupillidse, 47, 88, 123 

 Pupina bicanaliculata, x. 

 Purple Sea Snail. See Ianthina. 

 Purpura (Dog-Periwinkle), 54, 



68, 89, 104, 143 

 Purpura lapillus, 90 

 Pyramidula, 47, 88 

 Pythia plicata, viii. 



Radiolitidae, 49 

 Radula, 6, 9, 10, 125-127 

 Rangiidae, 58 

 Razor Fish. See Ensis. 

 Relationships of the Mollusca, 13 

 Reproduction, 87 

 Reproduction of lost parts, 135 

 Resemblances in external form, 



134 



Respiratory System, 7, 128 

 Rhachidian tooth, 12 

 Rhachiglossa, 24, 125 

 Rhaphistoma, 44 

 Rhipidoglossa, 24, 125, 132 

 Rhizochilus, 68, 81, 97 



Rhizochilus antipathicus, xi. 



Rimula, 95 



Rimula exquisita, vii. 



Ringicula ringens, v. 



Rissoia costata, Embryo, xxix. 



Robillardia, 81 



Rocellari dubia, xix. 



Roman Snail. See Helix po- 



matia. 

 Rongo, 142 

 Rossia, 75 



Rostellaria, 63, 97, 117 

 Rostellaria curta, x. 

 Rtidistes, 106 

 Rumina decollata, 21, 70, vii., xiii. 



Sagda Cookiana, xiii. 

 Salt-water, Fresh- water Molluscs 



in, 53 



Sanguinolaria, 64 



Saxicava, 54, 61, 119 



Saxicava rugosa, xix. 



Saxicavidae, 49 



Saxidomus, 142 



Scalaria = Epitonium 



Scalites, 45 



Scallop. See Pecten. 



Scaphander , 69 



Scaphander lignarius, xii. 



Scaphander lignarius : gizzard, iii. 



Scaphites, 38 



Scaphites (zqualis, xxii. 



Scaphopoda, 25, 51, 69, 106, 127 



Scaphula pinna, 57 



Scars of Muscle attachments, 33 



Scenella, 44 



Schizodentalium, 26 



Schizodentalium plurifissuratum, 95 



Scioberetia, 80, 109 



Scissurella, 129 



Scissurella crisp ata, vii. 



Scrobicularia, 57, 108 



Sculpturing, 5 



Scyllaa pelagica, xii. 



Sea-Butterflies. See Pteropoda. 



Sea- Hare. See Aplysia. 



Sea- Slugs. See Nudibranchia. 



Seasonal changes, effect of, 72, 73 



Sense organs, 8 



