CLASS BRACHIOPODA 
229 
apex of the small valve; internal apophysis similar to that of T. pulvinata, 
but much more delicate and thread-like, the two branches curving toward 
each other so as almost to touch. Length, half an inch; breadth, eleven- 
twentieths of an inch. (Gould.) 
Type locality, Puget Sound. 
Range. St. Paul Island, Alaska; Victoria and Queen Charlotte 
Islands, British Columbia; San Diego, California. 
Terebratalia occidentalis Dali, 1871. 
Proc. Cal. Acad. Sci., 4:182; pi. 1, fig. 7. 
Shell variable in size and shade of colour, usually of a flesh tint, deeper 
on some of the lines of growth. Sculptured by radiating ribs variable in 
number (9 in the typical specimen), with rather smooth interspaces, only 
crossed by more or less prominent lines of growth. Hinge line long, 
somewhat arched in the middle; area usually wide, sharply carinated, flat, 
crossed by transverse lines of growth. Apex not prominent, usually eroded. 
Foramen large, incomplete, deltidia widely separated and differentiated 
from the area by deep grooves. Typical specimen, .75 in. long; .6 in. wide; 
and .2 in. thick. (Dali.) 
Type in Cabinet of the California Geological Survey, No. 6. Type 
locality, off San Clemente Island, California. 
Range. San Pedro, California, to Cortez Bank, in 47 fathoms. 
Terebratalia obsoleta Dali, 1891. 
Proc. U. S. N. M., 14:186 and 17 :726; pi. 30, fig. 7. 
Shell scarlet, radiately streaked with pale yellow, especially in the 
channels between the ribs; surface polished, smooth except for rather 
distinct incremental lines and, in adult specimens, more or less distinct; 
partially obsolete radial ribs, which appear near the margin, but do not 
extend to the earlier half of the shell; in senile specimens a larger pro¬ 
portion of the shell is ribbed; pedicle valve with a rather low beak and 
wide, incomplete foramen; delitidial plates well developed but widely 
separated; valve wider (as a rule) below the middle, the arch of the base 
cut into three subequal parts by two especially strong ridges (correspond¬ 
ing to channels on the branchial valve), between which the surface of the 
valve may be more or less ribbed radially, but is always flattened or de¬ 
pressed, corresponding to an upward flexure of the basal margin; teeth 
strong, supported by deeply receding buttresses; no medial septum; the 
adductors with widespread ends, rather distant from the medial line, 
confined to the upper third of the valve; pallial sinuses large, divaricating 
near the margin from five principal trunks on each side; the gential glands 
yellowish, extending in narrow bands along the sinuses nearly to their 
furcation; peduncle short, dark brown; branchial valve flatter, with a 
