ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 157 



98. Tellina (Mcerella) salmonea Carpenter. 



Plate XIII, Fic. 7. 



Mtrr a salmonea Qvsi., Brit. Assn. Rept., 1863, p. 639; Ann. & Mag. Nat. Hist., 3id Ser., Vol. IV, 

 1864, p. 423. Keep, West Coast Shells, p. 196, 1892. 



Shell small, suboval, convex, equivalve, inequilateral, thin; umbones anterior to center, 

 small, sharp; anterior extremity short, rounded; posterior dorsal margin straight; posterior extremity 

 acutely rounded; ventral margin evenly arcuate; surface glossy, ornamented with fine, concentric, 

 incremental lines, and obsolete radiating scratches; cardinal tooth small, bifid; no lateral teeth; 

 pallial sinus long, broad; one faint, internal, submarginal, posterior, radiating ridge. 



Dimensions. — Long. 11 mm.; alt. 8 mm.; diam 4.2 mm.; umbo to anterior extremity 3 mm.; 

 to posterior extremity 8 mm. 



Resembles Bonax, but is mucb thinner, more evenly rounded anteriorly, 

 has no lateral teeth, and is not crenulated on the interior of the margin. Specimen 

 identified by Dr. Dall. 



Not uncommon in the lower San Pedro series at Deadman Island, whence the 

 specimen figured came. This specimen is now in the collection of Delos Arnold. 



Living. — Vancouver to Monterey (Carpenter). 



Pleistocene. — San Pedro (Arnold). 



Subgenus Angulus Megevle. 



Shells elongated, generally small, compressed, with the posterior end angularly pointed and 

 not twisted; the surface smooth or with fine concentric sculpture; nymphs short and prominent, the 

 ligament short; hinge with a single adjacent lateral well developed in the right valve anteriorly; 

 internally a thickened ray passes from the umbo just behind the anterior adductor scars, and one or 

 two narrower similar rays in front of the posterior adductors; sinus largely coalescent with the pallial 

 line below. 



Type, Tellina lanceolata Linnc'. 



99. Tellina (Angulus) button! Dull. 



Plate XVI, Figs. 1 and 2. 



Tellina (Oudardia) buttoni Dall, Trans. Wagner Inst. Sci., Vol. Ill, Part 5, 1900, p. 1036, 



PI. XLVII, fig. 18. 

 Angtilus modeslus of California collectors (not of Carpenter). 

 Tellina (Angulus) var. obtusus Cpr. (noi Tellina obtusa Sowerby.) 

 f Tellina pedroa7ia Con., Pac. R. R. Rept., Vol. V, p. 323, PI. Ill, fig. 17, 1855. 

 ? Macoma pedroana Con., Gabb, Pal. Cal., Vol II, pp. 94, 124, 1S69. Cooper, 7th Ann. Rept. Cal. 



St. Min., 1888, p. 248. 



Shell small, oblong, subtriangular, compressed, thin; umbones slightly posterior to center; 

 anterior dorsal margin evenly arcuate; anterior extremity quite acutely rounded, produced furthest 

 near base; ventral line subrectilinear; posterior extremity cuneiform, abruptly truncated at end near 

 base; surface sculptured by fine, concentric, incremental lines; one prominent cardinal tooth in each 

 valve; one sharp, anterior lateral tooth in right valve; pallial sinus large, does not quite reach to 

 anterior muscle-impression; anterior, radiating callus passes from umbo just posterior to the anterior 

 muscle-impression. 



Dimensions. — Long. iS mm.; alt. 10.5 mm.; diam. 4 mm.; umbo to anterior extremity 

 II mm.; to posterior extremity 7 mm. 



