Bd. III: 7. 
ANTARCTIC FOSSIL BRACHIOPODA. 
9 
The number standing in brackets after a locality — for instance Cockburn Island 
(II) — indicates the number by which the Swedish geologists distinguished the par- 
ticular spot. 
Family Lingulidae, Gray. 
Genus Lingula, Bruguiere. 
Lingula antarctica, sp. n. 
Plate I, fig. 7. 
Description. — Narrow, elongate, sides parallel, except for the posterior acumina- 
tion, which is sharp. Valves rather flat. Growth lines forming an oblong pattern 
throughout life. 
Remarks. — The contours of the growth lines are noticeable, indicating an 
oblong shell much like the adult at a very early age. The life-history as shown by 
the contours of the growth lines is as follows: — up to about 2 mm. in length the 
shell is elliptical in shape; at about 5 mm. an oblong shape is established, but there 
is an anterior tapering from behind the middle: the anterior end is squared. Later 
the anterior tapering becomes less and less so that at last the sides run parallel until 
the squared end is reached. 
DistinctioJi. — This species is somewhat like Lingula duinortieri, NyST (337, 
XXXIV, 4), and DavidsON (Tert. Brach. Belg., VII, i — 3), but is much more acu- 
minate posteriorly. Further, the growth lines shown both by Nyst and Davidson 
indicate a young shell with short and somewhat broad contour; but the growth 
lines of the Antarctic fossil indicate a very elongate and narrow young shell with 
nearly straight sides. 
This species is in shape, and in the character of its growth lines, very much 
like Glottidia palmeri; Davidson (Recent Brach. XXVIII, 5); but it does not show 
any indication of the internal median ridge characteristic of the dorsal valve of 
that genus. 
Locality. — Seymour Island (il), off Graham Land, Antarctica. 
Formatio)i. — The Seymour Island younger beds. 
Material. — One dorsal valve (figured): it is imperfect, but shows inside and 
outside; one (dorsal?) valve, about 25 mm. long; it is perfect in shape, but has lost 
some of the test, so that the growth lines are not readily followed: it is embedded 
in a block of sandstone with many specimens of Cerithium ; and its label says ‘slope 
of Locality 1 1 from the Cerithium bed.’ It shows the squared anterior end. 
Position of similar species. — L. dumortieri is a Pliocene species of P'urope. 
Davidson (Recent Brach. 218) says that Lingula jaspidea, Adams, is the same 
species; but it is difficult to see where there is much in common between his figures 
of the Recent species and Nyst’s of his fossil. 
2 — 082114: Schwedische Sûdpolar-Expediiicn içoi — iQoj. 
