338 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
PAGE 
Rhombochiton . 284 
rimuloides (Schismope) .229 
Rhodopetala . 158 
rhyssa (Solariella) . 196 
rimata (Barleeia) . 74 
Rissoidae . 78 
Rissoina . 104 
Rissoinidae . 104 
ritteri (Ischnochiton) . 272 
rosana (A1 vania) . 94 
rosanum (Micranellum) . 46 
rosea (Acmaea) . 158 
rossellinus (Circulus) . 222 
ruber (Lepidochitona) .256 
rubra (Barleeia) . 73 
rudis (Crucibulum) . 115 
rudis (Littorina) . 61 
rudis (Margarites) . 204 
rufa (Placiphorella) .316 
refescens (Haliotis) .232 
rugatum (Bittium) . 23 
rugatus (Lepidopleurus) .247 
rugosa (Tegula) . 177 
russa (Natica) . 123 
saccharina (Lepidochitona) .256 
salimba (Natica) . 123 
salmonea (Margarites) .203 
sal vania (Teinostoma) . 226 
sanjuanensis (A1 vania) . 103 
sanjuanensis (Barleeia) . 76 
sanjuanensis (Bittium) . 28 
sapiella (Teinostoma) .227 
sarcosa (Ischnochiton) .269 
scabra (Acmaea) . 153 
scabricostatus (Ischnochiton) .276 
Schismope . 229 
Schizoplax. 265 
scipio (Cingula) . 79 
Scissilabra. 224 
Scissurella.228 
Scissurellidae .228 
sculptum (Potamides) . 37 
sculpturatus (Vermetus) . 51 
scutulata (Littorina) . 62 
scutum (Acmaea) . 147 
Semibittium . 20 
serra (Bittium) . 29 
serratus (Hipponix) . 113 
serratus (Ischnochiton) . 278 
PAGE 
sharpei (Lepidochitona) .258 
sharpii (Margarites) ...202 
simbla (Margarites) . 205 
sinuata (Mopalia) . 309 
sinudcntatus (Ischnochiton) .283 
Sinum. 130 
sitchana (Littorina) . 60 
sitkensis (Lepidochitona) .257 
sitkensis (Velutina) . 141 
Skeneopsis. 84 
smithi (Margarites) .209 
smithi (Vitrinella) .219 
Solaricida . 193 
Solariella . 195 
spicata (Hanleya) .253 
spinosum (Crucibulum) . 115 
Spiroglyphus . 50 
splendens (Calliostoma) . 182 
splendidula (Haliotis) .231 
Spongioradsia . 263 
squalida (Littorina) . 59 
squamigerus (Aletes). 49 
stearnsi (Diastoma) . 10 
stearnsii (Tachyrhynchus) . 57 
stearnsii (Ischnochiton). 283 
stearnsii (Lamellaria) . 135 
stearnsii (Vitrinella) .218 
stelleri (Cryptochiton) .320 
Stenoplax . 267 
Stenoradsia .268 
stephensae (Amphithalamus) . 86 
stimpsoni (Placiphorella) .316 
stimpsoni (Truncatella) . 109 
stimpsoni (Turritellopsis) . 59 
striatus (Circulus) .222 
strigillata (Acmaea) . 155 
Stylidium . 18 
subaperta (Tegula) . 174 
subclevata (Margarites) .208 
submarmorea (Lepidochitona) .255 
subplanatum (Bittium) . 23 
subplanatus (Tachyrhynchus) . 58 
subpupoides (Halistylus) . 173 
subrotundata (Littorina) . 63 
substriata (Phasianella). 163 
subtenuis (Barleeai) . 74 
succincta (Margarites) .205 
supragranosum (Calliostoma) .... 189 
swanii (Mopalia) .306 
