IXDEX. 



Lunatia Lewisii. . . ..... .26 



Lucapina crenulata 36 



Luponia spadicea 24 



Lyonsia Californica 59 



Macoma incouspicua. ... 55 



nasnta 56 



Machara patula 57 



Martrinella Jewettii 26 



Modiola capax 48 



modiolus 25 



recta 43 



Monoceros engonatum. . . .20 



lapilluides. ... 19 



Moon she] 1 26 



Mopalia muscosa 41 



Mussel 4~ 



Mya arenaria 58 



My tikis Californianus. . . .47 



edulis .., .. ...47 



Nacella incessa 88 



Nassa Cooped 23 



fossa ta 22 



mendica 23 



perpinguis 22 



Natica clausa 27 



Olive 23 



Olivella biplicata 23 



baBtica 24 



Opalia borealis 28 



Omplialius fuscescens ... .31 

 Pachydesraa crassatelloides52 

 Pachypoma gibberosum. . .30 



Parapholas Californica 60 



Periwinkle 28 



^ecten aequisulcatus 46 



bastatus 46 



latiauritus 46 



Petricola carditoides 53 



Pbasianella compta 29 



Pheasant-shell 29 



Pholadidca penita 59 



Piddock 59 



Placuanomia macroschisma45 



Pomaulax undosus 30 



Pc-ammobia 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 



Sanoruinolaria Nuttallii.. 56 

 Scalar ia crebricostata. . . .28 



Scallop 45 



Schizothserus Nuttallii - . 54 



Scurria mitra 38 



Septifer bifurcatus 49 



Slipper-shell 37 



Solecurtus Californianus. .57 



Solen rosaceus 57 



sicarius 57 



Spindle shell 17 



Tapes staminea 53 



tenerrima. . ..... .54 



Tellina Bode^ensis 55 



Tellen 55 



Tonicia lirieata 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 



Zirphaea crispata 60 



ERRATA. 



Page 6, line 19 ; for " in," read is. Pa^e 8, line 6 ; for "0~<?rdw 

 read op:rculum. Page 24, line 3.2 ; for *" Cypraca" read Cypraea. 



* A 



