171 



V. Intermediate Shelf, Sand Bottom, 27 to 65 Meters, Southern Gulf: 



Hexacorallia 

 Heterocyathus aequicostatus^ 



Frosobranchiata 

 Calliostoma bonita 

 Astele rerna 



Architectonica placentalis 

 Calyptraea conica 

 Crucibulum scuttelatum^ 

 Crucibulum spinosum 

 Natica broderipiana 

 Natica colirna 

 Natica grayi 

 Polinices otis 

 Polinices uber 

 Sinum pazianum 

 Distorsio decussatus 

 Bursa caelata 

 Bursa nana 

 Murex elenensis 

 Murex recurvirostris 

 Hexaplex brass ica 

 Ocenebra perita 

 Ocenebra cf. vitatla 

 Eupleura muriciformis 

 Coralliophila hindsii 

 Cosmioconcha cf. palmer i 

 Strombina marksi 

 Cantharus capitaneus 

 Phos articulatus 

 Hindsia acapulcana 

 Nassarius pagodus 

 Nassarius versicolor 

 Latirus hemphilli 

 Fusinus centrifugus 

 Fusinus colpoicus^ 

 Fusinus dupetitthouarsi^ 

 Mitra erythrogramma 

 Milra hindsii 

 Gemmula hindsiana 

 Knefastia walkeri 

 Clavus roseolas 

 Clavus walkeri 

 Clathrodrillia alcestris 

 Hindsiclava andromeda 

 Turricula fusinella 

 Pleuroliria albicarinata^ 

 Pleuroliria picta 

 Terebra specillata 



Scaphopoda 

 Dentalium oerstedii oerstedii^ 

 Dentalium oerstedii numerosum 



Living only, sand bottom. 



Lamellibranchiata 

 Nuculana eburnea 

 Nuculana morella 

 Glycymeris multicostata 

 Glycymeris tessellata 

 Atrina, sp. 

 Chlamys circularise 

 Plicatula inezana 

 Cardita spurca beebei 

 Trachycardium belcheri 

 Lophocardium cummingii 

 Nemocardium pazianum^ 

 Chione mariae 

 Tellina pristophora 

 Semele paziana 



Crustacea 



Balanus concavus mexicanus^ 

 Porcellana cancrisocialis^ 

 Clibinarius, sp. indet. 

 Dardanus sinistripes^ 

 Paguristes digueti 

 Paguristes praedator^ 

 Pagurus gladius^ 

 Pylopagurus varians^ 

 Parapylocheles glasselli 

 Hypoconcha lowei^ 

 Calappa sausserei^ 

 Hepatus kossmanni 

 Iliacantha hancocki 

 Persephona townsendi 

 Randallia bulligera 

 Lithadia cumingii^ 

 Portunus acuminatus 

 Portunus affinus 

 Euphylax robustus 

 Medaeus lobipes 

 Leilolambrius punctatissimus 

 Heterocrypia macrobrachia 

 Solenolambrus arcuatus 

 Collodes gibbosus 

 Collodes tenuirostris^ 

 Euprognatha bifida^ 

 Paradasygius depressus^ 

 Pyromaia tuberculata^ 

 Stenorhynchus debilis 

 Notolopus lamellatus 

 Ethusa lata 



Ethusa mascrone americana 

 Oediplax granulata 

 Chasmophora macropthalma 

 Prionoplax cf. ciliata 



1) Indicates the same species found within the same depth range in the northern Gulf also. 



