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21:0824 Caecum crebricinctum Cpr. 438. 
Length 5.5 mm, diam. 1; thin; plug subangulate, bent to- 4 
ward convex side; annular ring sculpture very fine, close. Mon- — 
terey to San Diego, Cal., San Quintin bay, ‘Baja Cal. (Pleistocene). 
21:0285 Caecum magnum Stearns. 2634. 
Aperture circular, plug sharp; length 5 mm, diam. at base ~ 
0.9, at apex 0.3, otherwise much like crebricinctum. San Pedro, 
Cal. (Pleistocene). 
21:0826 Callista callosa Conr. Is Amiantis ec. 
21:0827 Callista subdiaphana pedroana Arnold, 1903. 
Type loc.—San Pedro, Cal. (Pleistocene). 
21:0828 Calyptraea echinus Brod. Is Crepidula aculeata. 
21:0829 Calyptraea fastigiata Gld. Is C. ‘mammillaris. 
21:0830 Calyptraea hytrix Brod. Is Crepidula aculeata. . 
21:0831 Calyptraea spinosa Sby. Is Crucibulum s. 
21:0832 Cancellaria gracilior Cpr. Is Admete g. 
21:0833 Capulus tumens Cpr. Is Hipponyx t. 
. 21:0834 Cardita ventricosa Gld. Is Venericardia v. 
21:0835 Cardium californicum Conr. Is C. corbis. 
21:0836 Cardium centifilosum Cpr. Is Protocardia c. 
21:0837 Cardium luteolabrum Gld.. Is C. quadragenarium. 
21:0838 Cardium nuttalli Conr. Is C. corbis. | 
21:0839 Cardium panamense Cooper non Sby. Is C. procerum. 
21:0840 Cerostoma foliatum Martyn is Murex f. 
21:0841 Cerostoma nuttallii Conr. is Murex n. 
21:0842 Cerithidea sacrata Gld. is californica. 
21:0843 Cerithiopsis assimilata is Seila a. 
21:8044 Cerithium californicum Hald. is Cerithidea c. 
21:0845 Cerithium filosum Gld. is Bittium f. 
21:0846 Cerithium sacratum Gld. is Cerithidea s. 
21:0847 Chemnitzia is Turbonilla. 
21:0848 Chione brevilineata Conr. is C. succincta. 
21:0849 Chione californiensis Brod. is C. succincta, 
21:0850 Chione callosa Sby. is C. fluctifraga. 
21:0851 Chione nuttalli Conr. is C. succincta. 
21:0852 Chiton amiculatus Sby. is Cryptochiton stelleri. 
21:0853 Chiton californicus Prescott, is Cryptochiton stelleri. 
21:0854 Chiton muscosus Gld. is Mopalia m. et ciliata. 
21:0855 Chiton regularis Cpr. is Ischnochiton r. 
21:0856 Chiton sitkensis Rve. is Cryptochiton stelleri. 
21:0857 Chiton stelleri Midd. is Cryptochiton s. 
21:0858 Chlorostoma Sw. is Tegula. 
21:0859 Chlorostoma marcidus Gld. is Phoreus puligo. 
21:0860 Chlorostoma montereyensis Kien. is Tegula montereyi. 
21:0861 Chlorostoma pulligo Mart. is Phorcus p. 
21:0862 Chorus belcheri Hds. is Trophon b. 
21:0863 Chrysallida Cpr. is sec. Odostomia. 
21:0864 Circinaria affinis Dall. 
21:0865 Clathurella canfieldi Dall. 
21:0867 Clathurella conradiana Gabb, is Mangilia c. 
21;0868 Clementia subdiaphana Cpr. is Callista s. 
21:0869 Clidiophora punctata Conr. is Pandora p. 
21:0870 Cominella corrugate Rev. is Amphissa c. 
21:0871 Conchoce le bisecta Conr. is Thyasira b. 
21:0872 Conchocele disjuncta Gabb. is Thyasira bisecta. 
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