169 



Echinoidea (continued) 

 Mellita, sp. 

 Lovenia cordiformis 

 Brissopsis pacifica 

 Moira clot ho 



Ophiuroidea* 

 Amphiodia occidentalis (Lyman) 



IV. Nearshore Shelf, Sand Bottom, 11 to 26 Meters, Southern Gulf: 



Hexacoraliia 

 Astrangia conferta^ 



Prosobranchiata 

 Architectonica placental is^ 

 Calyptraea mamillaris 

 Crepidula aculeata 

 Crepidula incurva 

 Natica broderipiana 

 Natica chemnitzii^ 

 Natica othello^ 

 Polinices intemerata 

 Polinices uber 

 Sinum debile''- 

 Sinum sanctijohannis^ 

 Ficus ventricosa 

 Distorsio decussatiis^ 

 Bursa nana 

 Eupleura muriciformis 

 Typhis cummingii^ 

 Strombina hirundo 

 Cominella subrostrata^ 

 Cantharus capitaneous 

 Nassarius pagodus 

 Oliva incrassata 

 Olivella anazora^ 

 Olivella flelcherae 

 Mitra hindsii 

 Cancellaria exopleiira^ 

 Hormospira maculosa 

 Conus perplexus 

 Terebra armillata 

 Terebra variegata 



Lamelli branch lata 

 Nucula declivis 

 Nuculana elenensis 

 Anadara concinna 

 Anadara nux^ 

 Anadara, sp. 

 Atrina maura 

 Chlamys circularis 

 Chlamys tumbezensis^ 



Lucina cancellaris 

 Ctena clarionensis 

 Trachycardium pananiense 

 Transanella puella 

 Pilar concinnus 

 Pilar frizzeli^ 

 Megapitaria squalida 

 Dosinia dunkeri 

 Chione gnidia 

 Chione, sp. 

 Mulinia bradleyi^ 

 Tellina cognata^ 

 Tellina felix 

 Macoma, sp. 

 Tagelus politus 

 Corbula nasuta 

 Corbula ovulata 

 Pandora claviculata 

 A bra palmeri^ 

 Lyonsia gouldii 

 Periploma, sp. 



Crustacea 

 Balanus trigonus 

 Euceramus panatelus^ 

 Dardanus sinislripes 

 Pagurisles praedator 

 Pagurus gladius 

 Pagurus smithi^ 



Echinoidea 

 Moira clotho 

 Brisaster toivnsendi (A. Agassiz) 



Asteroidea* 

 Astropecten californicus Fisher (juv.) 



Ophiuroidea 

 ? Amphiura seminuda Liitken and 

 Mortensen. 



1) These species confined primarily to the southern Gulf. 

 * Added after completion of Table 1. 



