173 



Scaphopoda 

 Dentalium splendidum 



Lamellibranchiata 

 Nuculana laeviradius 

 Anadara mazatlanica'^ 

 Anadara concinna 

 Anadara emarginata* 

 Anodontia edentuloides* 

 Chione kelletti'* 

 Corbula luteola 

 Corbula obesa* 

 Periploma carpenteri* 

 Cuspidaria pedinata 



Crustacea 

 Heterocarpus vicarius 

 Solenocarpus, sp. 



Pleuroncodes planipes 

 Dardanus sinistripes 

 Calappa sausserei 

 Mursia guadichaudi 

 Cancer porteri 

 Portunus iridescens 

 Medaeus lobipes 

 Stenorhynchus debilis 

 Ethusa ciliafrons'' 



Polychaeta 

 Protula snperba'' 



Echinoidea 

 Spatangus californiciis* 



Most abundant and charucterstic living species. 



VII. Outer Shelf, Sand Bottom, 66 to 120 Meters, Northern Gulf: 



Living only. 



Hexacorallia Scaphopoda 



Ceratotrochus franciscana Dentalium oerstedii 



Astrangia, sp. 



Opisthobranchiata 

 Cyclichna, sp. 

 Doridae 

 Eugorgia, sp. Rhizorus, sp. 



Triopha, sp. 



Octocorallia 

 ugorgia, sp. 

 Leptogorgia, sp. 



Prosobranchiata 



Calyplraea conica 

 Calyptraea mamillaris 

 Crepidula onyx 

 Crucibulum lignarium 

 Polinices intemerata* 

 Polinices otis 

 Sinum pazianum 

 Cymatium amictum* 

 Murex recurvirostris 

 Nassarius insculptus gordanus* 

 Fusinus dupetitthouarsi 

 Fusinus, sp. 

 Clavus cf. craneanus 

 Clathrodrillia, sp. 

 Hindsiclava andromeda 

 Mangelia, sp. 

 Turricula armilda* 

 Turricula nigricans 

 Pleuroliria artia* 

 Pleuroliria nobilis* 

 Pleuroliria oxytropis 

 Pleuroliria oxytropis albicarinata 



* Abundant or characteristic species. 



Lamellibranchiata 

 Nucula exigua* 

 Nuculana laeviradius 

 Amygdalum pallidulum 

 Plicatula inezana 

 Lucina excavata 

 Lucinoma annulata* 

 Nemocardium centrifilosum* 

 Nemocardium pazianum 

 Pilar catharius* 

 Chione mariae 

 Macoma medioamericana* 

 Corbula fragilis 

 Corbula luteola 

 Corbula obesa 

 Corbula ventricosa* 

 Pandora cf. brevifrons* 

 Cyathodonta dubiosa* 



Crustacea 



Munida tenella 

 Minyocerus kirki 

 Paguristes praedator 



