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U.S. NATIONAL MUSEUM BULLETIN 287 



*Crawfordia 

 =* Crawford ina 

 Cremides 

 ceryx 

 Crenella 



Columbiana 

 diaphana 

 duplinensis 

 grisea 

 japonica 

 leana 

 megas 

 minuscula 

 rotundata 

 Crepidula 

 aeola 

 aesop 



glottidiarum 

 orbiculata 

 precursor 

 ungana 

 Crisposcala 



acrostephanus 

 catalinae 

 *Crossostephanus 



palmeri 

 Crucibulum 



chipolanum 

 Cryptobranchia 

 alba 



instabilis 

 Cryptoconus 



tremperiana 

 *Cryptoctenidia 

 lima 

 magna 

 Cryptodon 

 barbarensis 

 fuegiensis 

 ovoideus 

 pyriformis 

 *Cryptogemma 

 adrastia 

 antigone 

 calypso 

 chrysothemis 

 cymothoe 

 eidola 

 oregonensis 

 polycaste 

 quentinensis 

 4*Cryptolepas 



rhachianecti 

 *Cryptomitra 



Cryptomya 

 magna 

 oregonensis 



*Cryptonatica 

 aleutica 

 consors 

 floridana 

 salimba 

 *Cryptopecten 

 alii 

 Ctena 



transversa 

 Cucullaria 

 aldrichi 

 endemica 

 sagrinata 

 taeniata 

 Cumingia 



densilineata 

 *Cunearca 

 alcima 

 cumanensis 

 initiator 

 Cuneocorbula 

 burnsii 

 harrisii 

 ira 



kaghriana 

 nucleata 

 sarda 

 seminella 

 sericea 

 sphenia 

 whitfieldi 

 Cuspidaria 

 apodema 

 arcuata 

 balboae 

 californica 

 chilensis 

 craspedonia 

 dispar 

 distira 

 hawaiensis 

 jeffreysi 

 microrhina 

 monosteira 

 oldroydi 

 pailoloana 

 panamensis 

 perrostrata 

 planetica 

 pseustes 

 subglacialis 



troseates 

 Cyathodonta 

 cruziana 

 dubiosa 

 galapagana 

 guadalupensis 

 lucasana 

 pedroana 

 spenceri 

 vicksburgiana 

 "^Cyamus 

 gracilis 

 mysticeti 

 scammoni 

 suffusus 

 tentator 

 *Cyclinella 



gatunensis 

 singleyi 

 *Cyclocalyx 

 Cyclocardia 

 alaskana 

 armilla 

 californica 

 incisa 

 moniliata 

 morsei 

 stearnsii 

 Cyclodontina 



branneri 

 *Cyclolimnaea 

 *Cyclomactra 

 Cyclopecten 

 cocosensis 

 rotundus 

 *Cyclorisma 

 *Cycloscala 



dunkeriana 

 Cyclostrema 

 chipolanum 

 cistronium 

 granulum 

 limatum 

 pompholyx 

 turbinum 

 "^Cydippina 

 extenuata 

 Cylichna 



verrillii 

 Cylichnella 

 atahualpa 

 diegensis 

 gabbi 



