94 CALIFORNIA ACADEMY OF SCIENCES. 



Distiriijiiislmhlc externally from L. cnlifornlcus by thicker shell, waxen ratlior 

 tli;ui rmliiy coloration, and larijjer foranu'ii. Specimen identified by Dr. Dail. 

 Speeimens wiiioh may be of this sjiecios are laiieled " L. rdlifornicits" in the State 

 Mu-senin collection of fassils at Berkeley. Found in Pliocene of Deadman Island; 

 two specimens, one by Mrs. Oldroyd. Fonnd in Pliocene of Pacilic Beach, near San 

 Diego, and also in the Pliocene of Packard's Hill, Santa Barbara. 



Living. — Aleutian Islands to point ofl Estero Bay, near San Luis Obispo, (75 

 to 238 fathoms) Dall. 



Pliocene. — San Pedro (Arnold; Oldroyd): Santa Barbara; San Diego (Arnold). 



Family V. LTNGULID^. 

 Subfamily LINGULIN^. 



Genus Glottidia Ihdl. 



Shell linguiform, elongate, pedunculated ; dorsal valve provided internally with two sharp, 

 narrow, incurved lamina-, diverging from the beak, and extending about one-third the length of the 

 shell ; ventral valve with a mesial septum of about the same length, e.Ktending forward from the 

 beak ; anterior adductor impressions rounded ; scar of post-adductor close in cavity of beak, 

 rounded ; shell smooth, perforate or imperforate. 



Type, Glottidia albida Hinds. 



[S. B.] Glottidia albida Hinds. 



Lingula albida Hinds, Zoo). Sulph., p. 298, Pi. XXIX, fig. 4, 1845. G. W. Sowerby, Thes. 



Conch., p. 393, PI. LVII, fig. 6, 1846. DAvrosoN, Ann. & Mag. Nat. Hist., 2nd Sen, Vol. 



IX, 1852, |i. 377. Reeve, Conch. Icon., Monog. Lingula, Fl. I, fig. 4, 1859. E. Suess, 



Sitz. k. Akad. Wiss. Wien, Bd. XXXVII, 1859, p. 230. Carpenter, Brit. Assn. Rept. 



1863, p. 636. Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 246. Keep, West Coast 



Shells, p. 215, fig. 182, 1892. 

 Glottidia albida HiNDS, Dall, Am. Journ. Conch., Vol. VI, 1870, p. 157, PI. VIII, figs. 1-6; Proc. 



Phil. Acad. Nat. Sci., 1873, p. 204; Scientific Results Expl. Alaska, 1877. David.son, 



Challenger Rept. (Zool.) Vol. 1, 1880, p. 26; Recent Brachiopoda, Part 3, 1886, p. 221, PI. 



XXVIII, figs. 2-4. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1893, p. 182. 



Shell narrow; elongated, oval, linguiform, tapering at the beaks, sides almost subparallel- 

 very slightly curved in front; rather flat, marked with concentric lines of growth; in interior of ven- 

 tral valve the beak is pointed, with a small triangular-shaped thickening grooved along the middle; 

 mesial septum extends for one-third length of valve; scars as in generic description. 



Dimensions. — Long. 27 mm.; lat. 11 mm.; diam. 5.5 mm. 



One perfect valve and two imperfect valves of this species were found in the 

 Pliocene of Packard's Hill, Santa Barbara. 



Living. — Monterey to Magdalena Bay, Lower California (Davidson). 



Pliocene. — Santa Barbara (Arnold): San Diego well (Hcmi>liili). 



