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CALIFORNIA ACADEMY OF SCIENCES. 



Acmaa insesna 

 ArUton punctocielata 

 BHlium filosum 

 Bittium quadrifilatum 

 Bittium rugatiim 

 Ccecum californkum 

 C'cecum crehricinclum 

 Caecum magnum. 

 Calliosloma canallculatum 

 Calliostoma costatum 

 Calliostoma tricolor 

 Cerithidia cali/ornica 

 Chlorostoma /unebrale 

 Chlorosloma var. aubaperlum 

 Chlorostoma var. Urjulatum 

 Chrysodomus labulatus 

 Clathurella conradiana 

 Clipidella bimaculata 

 Clipidella callomarginata 

 Colvmbella californiana 

 Columbella chrysalloidea 

 Columbi-lla gausapata 

 Columbella var. carinata 

 Columbella iuberosa 

 Conus cali/ornicus 

 Crepidula aculeata 

 Crepidula adunca 

 Crepidula navicelloides 

 Crepidula onyx 

 Crucibulum spinosum 

 Drillia hemphilli 

 Drillia var. penicillala 

 Drillia lorosa 



GASTROPODA. 



Eulima micans 

 Fissuridea aspera 

 Fissurella volcano 

 Oalerus mammillaris 

 Hipponyx cranioides 

 Hipponyx lumens 

 Ixapis fene strata 

 Lacuna porrecta 

 Leptothyra carpenteri 

 Litlorina planaxis 

 Littorina scutulata 

 Mangilia angulata 

 Margarita var. knechti 

 Margarita var. nodosus 

 Margarita var. pedroana 

 Marglnella jexoetti 

 Melampus olivaceus 

 Mitra maura 

 Monoceros engonatum 

 Nassa fossata 

 Nassa mendica 

 Nassa var. cooperi 

 2^assa perpinguis 

 Kassa tegula 

 Neverita recluziana 

 Ocinebra barbarensis 

 Ocinebra inler/ossa 

 Ocinebra var. aspera 

 Ocinebra var. cerritensis 

 Ocinebra poulsoni 

 Odostomia gouldii 

 Odostomia tenuis 

 Olivclla biplicata 



Olivella intorta 

 Olivella pedroana 

 Pachypoma inaijuale 

 Paludestrina curta 

 Paludestrina stohesi 

 Phasianella compta 

 Physa htteroslropha 

 Planorbis titmidun 

 Planorbis vermicularis 

 Pleurotoma perversa 

 Scala crebricostata 

 Scala hindsii 

 Scala indianorum 

 Scala tincla 



Serpulorbis squamigerus 

 Taranis sirongi 

 Terebra simplex 

 Tornatina cerealis 

 Tornatina culcitella 

 Trophon pedroana 

 TurboniUa aurantia 

 Turbonilla crebrifilata 

 TurboniUa laminata 

 Turbonilla lowei 

 Turbonilla muricata 

 Turbonilla similis 

 Turbonilla slearnsii 

 Turbonilla subcuspidata 

 Turbonilla tenuicula 

 Turbonilla var. stylina 

 Turbonilla Iridenta 

 Turriiella cooperi 

 Volvarina varia 



SCAPHOPODA. 

 Dentalium hexagonum Dentalium indianorum 



CRUSTACEA. 



Balanus concavus 



ECHINOIDEA. 



Echinararhnius excentricus 



This fauna comprises one hundred and forty species, of which thirty-seven are 

 pelecypods, ninety-nine are gastropods, two are scaphopods, one is a crustacean, and 

 one an echinoderra. The fauna of the lower beds of the San Pedro bhilTs approaches 

 a little nearer that of the upper San Pedro series than does the fauna of the same 

 formation on Deadman Island. This may mean that part of the lower San Pedro 

 beds was removed from the Deadman Island deposit before the deposition of the 

 upper Pleistocene strata. 



The following species occur in the lower San Pedro deposits of the San Pedro 

 bluflfs which have not been reported from the same horizon of Deadman Island: 



