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CALIFOENIA ACADEMY OF SCIENCES. 



Acmtfa insessa 

 AcUton piinctocielata 

 Bittium Jilosum 

 Biitium quadrijilatum 

 BiUiwm rugatiim 

 Oacum ralifornirum 

 (.'cecum crehricinclum 

 Cacum magnum. 

 Calliostoma canaliculalum 

 Calliostoma costatum 

 Caltiostonia tricolor 

 Cerilhidra californka 

 Chlorostoma futiebrale 

 Chlorostoma var. suhapertum 

 Chlorostoma var. ligulatum 

 ChryKodomus labulalus 

 (-'lalhurella conradiana 

 Clipidella himaculata 

 Clipidella callomarginata 

 Columbella californiana 

 Columbella chrysalloidea 

 Columbella gausapata 

 Columbella var. rarlnaia 

 Columbella tiiberosa 

 Conus cali/ornicus 

 Crepidula aculeata 

 Crepidula adunca 

 Crepidula navicelloides 

 Crepidula onyx 

 Crucibulum spinosum 

 Drillia hemphilll 

 Drillia var. penicillata 

 Drillia torosa 



GASTROPODA. 



Eulima micans 

 Fissuridea aspera 

 Fissurella volcano 

 Galerus mammillaris 

 Hipponyx cranioides 

 Hipponyx iumciis 

 Isapis fenestrata 

 Lacuna porrecla 

 Leptothyra carpenteri 

 Liltorina planaxis 

 Liitorina scutulata 

 Mangilia angulata 

 Margarita var. knechti 

 Margarita var. nodosus 

 Margarita var. pedroana 

 Marginella jewctti 

 Melampus olivaceus 

 Mitra maura 

 Monoccros engonatum 

 Nassa fossata 

 Nassa m,endica 

 Nassa var. cooperi 

 Nassa perpinguis 

 Nassa tegula 

 Neveriia recluziana 

 Ocinebra barbarensis 

 Ocintbra inter/ossa 

 Ocinebra var. aspera 

 Ocinebra var. cerritensis 

 Ocinebra poulsoni 

 Odostomia gouldii 

 Odostomia tenuis 

 Olivclla biplicata 



Olivetla intorta 

 Olivella pedroana 

 Pachypoma inaijuale 

 Paludestrina curta 

 Paludestrina stolcesi 

 Phasianella compta 

 Physa heteroslropha 

 Planorhis tiimidus 

 Planorbis vermicularis 

 Pleuroloma perversa 

 Scala crebricostata 

 Scala hindsii 

 Scala indianorum 

 Scala tincta 



Srrpulorbis sijuamigerus 

 Taranis slrongi 

 Tercbra simplex 

 Tornatina cerealis 

 Tornatina culcitella 

 Trophon pedroana 

 TurboniUa aurantia 

 Turbonilla crebrifilala 

 TurboniUa laminata 

 Turbonilla lowei 

 Turbonilla muricata 

 Turbonilla similis 

 Turbonilla stearnsii 

 Turbonilla subcuspidata 

 Turbonilla lenuicula 

 Turbonilla var. stylina 

 Turbonilla tridenta 

 Turrilella cooperi 

 Volvarina varia 



SCAPHOPODA. 

 Dinlalinm hexagonum Dentalium indianorum 



CRUSTACEA. 

 Balanus concavus 



ECHINOIDEA. 



Echinarachnius 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 echinoderm. The fauna of the lower beds of the San Pedro bhiflfs approaches 

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

 formation on Dead man 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: 



