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CALIFORNIA ACADEMY OF SCIENCES. 



Crepidula adunca 

 Crepidula grandis 

 Crepidula navicelloidtx 

 Crepidula onyx 

 Crepidula riujosa 

 Crucibulum spinosum 

 Cypreea spadicea 

 Drillia var. penicillala 

 Driliia iorosa 

 Eupleura muriciformis 

 Fissuridea aspera 

 Fissuridea incequalis 

 Fissuridea niurina 

 Fissurella volcano 

 Fusus barbarensis 

 Fhtsus lutcopiclus 

 Fusus robustus 

 Haliolis fulrje.ns 

 Hipponyx cranioides 

 Hiyiponyx lumens 

 Isapis fencstrata 

 Lacuna porrecla 



Ocinebra poulsoni 

 Olivella biplicala 

 Olivclla intorta 

 Olivella pedroana 

 Pisania fortis 

 Pleurotoma carpenteriana 

 Pleurotoma perversa 

 Priene oregonensis 

 Purpura crispata 

 Ranella californica 

 Hcala crebricostata 

 Scala hindsii 

 Scala indianorum 

 Scala lincla 



Serpulorbis squamigerus 

 Spiroglyphus liluella 

 Terebra simplex 

 Tornalina culcitclla 

 Turrilella cooperi 

 Turrilella jeivetli 

 Volvnrinn varin 



Litlorina scutulata 

 Margarita var. pedroana 

 Marginella jewelti 

 Melampus oiivaceus 

 Mitra maura 

 Monoceros engonaium 

 Murex feslivus 

 Murex trialatus 

 Nassa californiana 

 Nassa fossata 

 Nassa mendica 

 Nassa var. cooperi 

 Nassa perpinguis 

 Nassa tegula 

 Natica leimsii 

 Neverila recluziana 

 Norrisia norrisii 

 Ocinebra interfossa 

 Ocinebra Iceepi 

 Ocinebra var. aspera 

 Ocinebra perita 



CEUSTACEA. 

 Balanus concavus 



ECHINOIDEA. 



Echinarachnius exeentricus 



SCAPHOPODA. 



Dentaliuin semipolituin. Denialium hexagonum 



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

 eight are pelecypods, eighty-two are gastropods, two are scaphopods, one is a crusta- 

 cean, and one is an echinoderm. This fauna is not as large as that of the upper 

 San Pedro series at the north end of the San Pedro bhiff, so the discussion of the 

 faana will follow the list of species obtained from the latter locality. 



There is a railroad cut a few feet in depth near the southwestern limit of the 

 San Pedro terrace. (See I), diagram U, PI. XXIII.) On both sides of this cut 

 there is exposed a bed of gravel consisting of sand, numerous well preserved fossils, 

 and water-worn pebbles of Miocene shale, many of which are full of pholas holes. 

 The bed is from two to three feet thick, and rests unconformably on the upturned 

 edges of the Miocene shale, which at this point dips northeast at an angle of about 

 15°. The gravel stratum dips gently toward the south, and is overlain by soil, which 

 varies from three to five feet in thickiiess, growing thicker toward the south. This 

 layer is also exposed at the top of the sea-cliff near D, and at many places along the 

 top of the cliff from D to Timm's Point. This formation is exceptionally well de- 

 veloped on the sides of the ravine which cuts the bluff at Crawfish George's, showing 

 a thickness of three feet, very fossiliferous, and, in some places, hardened by calcare- 

 ous cement. The deposit at Crawfish George's is mentioned by Ashley,^ who refers 

 it to the Pliocene. 



1 Neoceue of the Santa Oniz Mountains. By Geo. H. Ashley. Proc. Cal, Acad. Sci., 2nd Ser., Vol. V, 1894, p. 341. 



