TRIBE BRACHIOPODA. 329 
sometimes very obsolete, sometimes very large, particularly those 
which form the sides of the mesial furrow. Var. T. Rucurva, Quoy, 
Ast.—Sow. Th. 1, p. 350, t. 69, f. 34, 5, 6. Rounded-subtetragonal ; 
edge undulated, flexuous at the sides dorsally ; mesial ridge obsolete ; 
lower valve broader than long. 13. Australia.* 
T. Gravit. Davids. Z. P. 1852, t.14, f.1, 2, 8.— WarpuEmni G. 
Gray, Brach. p. 79. Suborbicular, reddish yellow, becoming deep 
red at the lines of growth, radiated with numerous unequal bifur- 
cated and intercalated ribs ; upper valve convex ; lower valve flattish ; 
beak obtuse, with distinct lateral ridges; perforation very large, in- 
complete; deltidia disunited; loop elongated, reflected. 12..,14. 
Korea. 
T. Caput-SERPENTIS.*—Anomia ©. Retusa and Pusescens, Lin. 
—T. R. Retz.— A.C. Ch. 11, f. 2018.—W.t. 11, f. 22.—T. C. 
Lam.—Sow. G.—Phil. 95.—Sow. Th. 1, p. 348, t. 68, f. 1 to 4, and 
t. 72, f. 116.—Br. Mol. 2, p. 353, t. 56, f. 1, 2, 83, 4.—T. Costata, 
Lowe, Z. J. 2.—T. Aurira, F'lem.—TEREPRATULINA C. Gray, Brach. 
p. 49. Ovate, of a rounded somewhat pentagonal figure, whitish ; 
_ valves nearly equally convex, with radiating dichotomous subgranular 
costelle ; margin minutely crenulated, flexuous at the sides, slightly 
notched ventrally. Upper valve somewhat beaked, its perforation 
moderate, oblique, incomplete; hinge-area rather flattened, deltidia 
nearly obsolete ; internal appendage small, about one-third the length 
of the shell, arched below, and vaulted. 3. Hurope.? 
T. SEPTENTRIONALIS. Conthouy, Bost. J. 2.—Sow. Th. 1, p. 344, 
t. 68, f. 7, 8.—'T. Caput-sERPENTIS, Gould, Mas. 141.—TEREBRA- 
TuLINA S. Gray, Brach. p. 50. Subovate, obtusely acuminated dor- 
sally, nearly white; valves almost equally convex, with very slender, 
dichotomous radiating roughish little ridges ; margin minutely crenu- 
lated, flexuous at the sides, nearly straight ventrally, perforation 
rather large, not complete, somewhat oblique; hinge-area nearly 
flattened, with small nearly obsolete deltidia; internal appendages 
small, two-fifths of the length of the valve, arched ventrally, with a 
little branch above on each side, joined in the middle. 3. U. States. 
Distinguished from the last by its finer styia, its larger and less oblique 

t T. Rorunpata, Lam. 5.—E. t. 239, f. 5. “ Rounded, whitish, 
smooth (with only very delicate concentric striz) ; ventral edge bipli- 
cated, contracted on either side.” Not since recognised. 
2 This and the six following species belong to TEREBRATULINA. 
“ Finely striated, auriculate ; deltidium usually rudimental ; foramen 
incomplete ; loop short, rendered annular in the adult by the union 
of the oral processes.” 
2B 
