138 University of California Publications in Geology [Vol. 



Family Pandoridae 

 Genus PANDOEA Brug. 

 PANDORA (PANDORA) ACUTIROSTRATA, n. sp. 

 Plate 11, figures 7, 9 and 13 



Type specimen 11111, Coll. Invert. Palae. Univ. Calif., loc. 1131 



Shell thin, rather small, elongate-ovate, rostrate posteriorly; beaks inconspicu- 

 ous, situated about two-thirds the distance from the posterior to the anterior end; 

 anterior dorsal slope short, nearly straight ; posterior dorsal slope straight ; 

 anterior end rather broad, evenly rounded; posterior end narrow, obliquely trun- 

 cated ; ventral edge regularly and rather strongly arcuate. Posteriorly there is a 

 faint, broad, elongate, strongly depressed, slightly concave escutcheonal area, the 

 larger part of which is on the left valve where it is separated from the main outer 

 surface of the shell by a distinct ridge; parallel to this ridge and about half way 

 between it and dorsal edge there is a faint groove which extends from the beak 

 to the posterior end. Left valve convex ; right valve flat ; surface smooth except 

 for the incremental lines. Muscle scars elongate, subquadrate in outline; anterior 

 scar on the type more distinct than the posterior; two short but well-defined car- 

 dinals in right valve. Dental formula of right valve R 1010 ; this, according to 

 the classification given by Dall,n5 places the species in the subgenus Pandora. 



Dimensions. — Type specimen: length, 14 mm.; height, 8 mm.; diameter, about 

 3 mm. 



Occurrence. — University of California locality 1131. 



Family Litcinidae 



Genus PHACOIDES Blainville 



PHACOIDES cf. ACUTILINEATUS (Conrad) 



Lucina acutilineatus Conrad, Geol. U. S. Expl. Exped., p. 725, pi. 18, figs. 2, 

 2a, 2b, 1849. 



Pectunculus patulus Conrad!, Geol. U. S. Expl. Exped., p. 726, pi. 18, figs. 

 8, 8a, 1849. 



Several species of the genus Phaeoides in the Tertiary of the "West 

 Coast have been confused with one another. This is especially true 

 of the species P. acutilineatus Conrad. The species, common in the 

 Lower Miocene of the West Coast and listed in nearly all the faunal 

 lists of that horizon as P. acutilineatus, is very close to P. annulatus 

 Reeve, a common Recent species on the West Coast. A careful study, 

 based on a larger amount of material than the writer has at hand, may 

 show it to be different ; apparently it is not P. acutilineatus Conrad. 

 In Professional paper, United States Geological Survey, no. 59, p. 116, 

 pi. 12, fig. 6, W. H. Dall has described and figured a form from the 



us Trans. Wagner Free Inst. Sci., vol. 3, pt. 6, p. 1516, 1903. 



