14 
OCCASIONAL PAPERS OF THE CALIFORNIA ACADEMY OF SCIENCES 
Number 159 
Selected Synonymy & References 
■[Laytonia califomica David 1943:13-17, pi. 1, fig. 4, pi. 2, fig. 1 
Type Specimen: f Laytonia califomica David 1943, holotype, LACM (CIT) 10227, nearly complete left and 
right counterparts (see Remarks). Halosauridae. 
Type Locality : LACM (CIT) locality 317, “Sepulveda Tunnel”, Modelo Formation, Late Miocene, Santa 
Monica Mountains, Los Angeles County, California. 
Referred specimens : Known only by type specimen. 
Remarks : In her description, David (1943:13) mislabeled the type specimen as LACM (CIT) 10224, however 
in the legend of plate 2, fig. 1, it is correctly labeled as LACM (CIT) 10227. She labels the left counter¬ 
part on pi. 1, fig. 4 as number 15 of the Layton collection and the right counterpart on pi. 2, fig. 1 as LACM 
(CIT) 10227. The LACM specimen catalog lists both counterparts as LACM (CIT) 10227. Therefore, the 
left and right slabs are the same specimen as David (1943) more or less states. The left counterpart (Layton 
number 15) is in the Type Collection at LACM and the right counterpart is presumed missing. 
Figure 2. f Laytonia califomica David 1943, holotype, LACM (CIT) 10227 [from color photo provided by G. Takeuchi (LACM)]; 
scale bar equals 2 cm. 
t Laytonia cf. L. califomica David 1943:David 1948 
Referred Specimens: in David 1948:94-100, pi. 23. fig. 3: text-fig. 1 : From LACM (CIT) locality 391, San 
Marcos Pass, formation not given, Miocene, Santa Barbara County, California; LACM (CIT) 10399, 
skull with left and right counterparts (pi. 23, fig. 3; text-fig. 2a, b). 
From LACM (CIT) locality 5557, Brea Olinda Oil Field, formation not given, latest Miocene, Orange 
County, California; LACM (CIT) 10400, scale (left and right counterparts, text-fig. 1). 
From several uncatalogued localities in Los Angeles and Ventura counties: numerous uncatalogued scales. 
Remarks : David (1948:94) listed specimen LACM (CrT) 10400 under the heading of “Type scale” and its 
locality as “Type locality” (our quotation marks), however the type specimen and type locality are noted 
above in the description of f Laytonia califomica. 
t Laytonia ? zemorrensis David 1948 
Selected Synonymy & References 
t Laytonia sp. David: David 1944:32, pi. 3, fig. 23. 
t Laytonia ? zemorrensis David 1948:95-97, pi. 23, fig. 2. 
Type Specimen : f Laytonia*! zemorrensis David, holotype, LACM (CIT) 10401, scale, whereabouts unknown. 
Type Locality : LACM (CIT) locality 4376, ‘Texas Company Pioneer Unit Plan 1”, formation not given, Early 
Miocene (Oligocene in LACM database), Kern County, California. 
Referred Specimens : Several uncatalogued localities (oil well cores) of Miocene age in Kern and San Luis 
Obispo counties: numerous uncatalogued scales. 
