INDEX. 
61 
Lun at i a Lewisii 26 
Lucapina crenulata 86 
Luponia spadicea 24 
Lyonsia Californica 59 
Macorna inconspicua. ... 55 
— nasnta 56 
Macliara patula 57 
Marginella Jewettii .... .26 
Modiola capax 48 
— modiolus. .... . .25 
— recta 48 
Monoceros engonatnm. . . .20 
lapilloides. ... 19 
Moon shell. ... 28 
Mopalia muscosa 41 
Mussel 4 7 
My a arenaria 58 
Mytilus Californian us . . .47 
— edulis ..... ...47 
Nacella incessa 88 
Nassa Coo peri 23 
fossata .22 
mendica 23 
perpinguis 22 
Natica clausa 27 
Olive. 23 
Olivella hiplicata 23 
beetiea 24 
Opalia borealis 28 
Omplialius fuscescens ... .31 
Pachydesma crassatelloides52 
Pachypoma gibberosum. . .30 
Parapholas Californica. . . .60 
Periwinkle 28 
Pecten aequisulcatus 46 
liastatus 46 
latiauritus 46 
Petricola carditoides 53 
Phasianella compta 29 
Plieasant-sliell 29 
Pholadidea penita 59 
Piddock .59 
PI ac uanomia m acroschism a45 
Pomaulax undosus 30 
Psatnmobia rubro-radiata . 56 
Pteronotus festivus .17 
Purples 18, 19 
Purpura canaliculata 18 
— crispata 19 
saxicola. 18 
Ranella Californica 17 
Razor-shell 57 
Rock-clam 52 
Rupellaria lamellifera. . . .54 
Sand shell ..56 
Sanguinolaria Nuttallii.. 56 
Scalaiia crebricostata. . . .28 
Scallop 45 
Schizotliaerus Nuttallii - . 54 
Scurria mitra 38 
Septifer bifurcatus. . 49 
Slipper-shell. .37 
Solecurtus Californianus. .57 
Solen rosaceus 57 
sicarius 57 
Spindle shell 17 
Tapes stain inea 53 
tenerrima . . .54 
Tellina Bodegensis. 55 
Tellen 55 
Tonicia lineata 42 
Top-shells 29, 33 
Tornatella punctocselata. .43 
Triangle-shell. 52 
Trivia Californica. ... . , 25 
Trochiscus Norrisii ... . .33 
Turban 31 
Trigona 52 
Univalve, description of.. .9 
Washington clam 54 
Wedge-shell 57 
Zirphsea crispata 60 
ERRATA. 
Page 6, line 19 ; for “ in,” read is. Page 8, line 6 ; for “ o^erclum” 
read operculum. Page 24, line 32 ; for “ Cypraca read Cypraea. 
