206 



REFERENCE TO PLATES. 



FIGCRES. PLATES. SPECIES. PAGE 



v 232 13 ^olis papillosa, Linn 113 



233 13 salmonacea, Cou-h 113 



234 13 Flabellina Bostoniensis, Couth 114 



i>35 13 rufibranchialis, Johnst 114 



236 13 pilata, Gld 114 



237 13 stellata, Stimp 114 



238 13 picta, A. & H 115 



239 13 diversa, Couth 115 



240 14 Tergipes despecta, Johnst 116 



241 14 gymuota, Couth 116 



241a 14 Calliopsea fuscata, Gld 116 



242 14 Hermsea cruciata, Agass 117 



243 14 AlderiaHarvardiensis, Agass 117 



244 14 Clcelia fuscata, Gld 117 



245 14 remigata, Gld 117 



246 14 Elysia chlorotica, Agass US 



247 14 Elysiella catulus, Agass 118 



248 14 Cavolina 'tridentata, Gmel 120 



249 14 Diacria trispinosa, Les 120 



250 14 Clio pyramidata, Linn 120 



251 14 Styliola vitrea, Verrill 121 



252 14 Psyche globulosa, Rang 121 



253 14 Limacina helicina, Gmel 121 



2.34 14 Spirialis Gouldii, Stm 122 



255 14 Alexandri, Verrill 122 



256 14 Clione limacina, Phipps 122 



257-9 15 Pholas costata, Linn 125 



260-1 16 truncata, Say 126 



262-3 16 Dactylina Campechensis, Gmel 126 



264-6 16 Zirphsea crispata, Linn 1'27 



267-S 17 Martesia cuneiformis, Say 127 



269 17 Diplothyra Srnithii, Tryon 128 



270 17 Kocellaria ovata, Sowb 128 



271 17 Stimpsonii, Tryon 128 



272-4 17 Teredo dilatata, Stm 129 



275-?0 17 navalis, Linn 130 



2S1-3 17 megotara, Hanley 130 



284-6 17 Thomsonii, Tryon 131 



287-91 IS Norvagica, Speugl 130 



292-4 18 chlorotica, Gld 131 



29-3-7 18 Xylotrya fimbriata, Jeff 132 



'298 18 Periploma papyracea, Say 133 



29;>-:- ! 00 18 Siliqua costata, Say 143 



301 19 Lyonsia hyalina, Conr 134 



302 18 areuosa, Mull 134 



303 18 Thracia myops-is, Beck 135 



304 18 trui>cata, M. & A , 135 



305-7 18 Pandora trilineata, Say 136 



308-9 19 Thracia Conradi, Couth 134 



310-13 19 Saxicava arctica, Linn 137 



314-15 19&20 Panopsea Norvegica. Speng 137 



31*5-17 20 Cyrtodaria siiiqua, Chemn 138 



318 20 Solemya borealis Totten 139 



319 20 velum, Say 139 



320-25 20 & 22 Mya truncata Linn 140 



321 21 Panopaa bitruncata, Coiir 138 



322-4 21 Mya areuaria, Linn 140 



325 22 truncata, Linn 140 



326-7 22 Corbula contracta, Say 141 



328 22 Neasra pellucida, Stimp 141 



329-30 22 Soleu viridis, Say 142 



3tt 22 Ensis Americanus, Gould 142 



332 22 Siliquaria gibba, Spengl 143 



333 22 divisa, Spengl 143 



334 22 Siliqua costata, Say 143 



335 23 divisa, Spengl 143 



336-7 23 Mactra solidissima, Chemn 144 



338-9 23 lateralis, Say 145 



340-1 24 ovalis, Gould 145 



342 24 fragilis, Chemn 145 



343 25 Raeta canaliculata, Say 146 



344 25 lineata, Say 146 



345 25 Tellina alternata, Say 148 



346-8 24 polita, Say 148 



349 24 tenera, Say 148 



350-1 25 tenta, Say 149 



352-3 25 modesta, Verrill 149 



354 26 iris, Say .149 



