THE BRACHIOPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 375 
p. 43) * of specimens of L. wva from 111 fathoms, East Cape Byron, Australia, may be 
founded on a similar error in determination. 
Inothyrina wva (Brod.), var. notorcadensis, nov.t (PI. L. figs. 1-3.) 
Hab.—Station 325; lat. 60° 43’ 42” S., long. 44° 38’ 33” W. (Scotia Bay, South 
Orkneys), 6 fathoms. February 1, 1904. Sea bottom, sand. Temperature 32°'5 F. 
Obs.—At this station some remarkably large oval forms of a Lnothyrina were 
obtained in very shallow water. These, for reasons given below, and in order to call 
greater attention to them, I have ventured to describe under the above heading. 
Four specimens in all were obtained here, two large, one of medium size, and one 
very young. i 
The measurements of these examples are as follows :— 
Length. Breadth. Thickness. 
No. 1 (dead) . ; : . 39 28°5 25 mm. 
mee (ive). : : cei) 22 Ss 
yer (dead)) «2 : : meals 16 libs 4 
» 4(dead) . : 3 - 275 2°5 
Examples Nos. 1, 2, and 3 are all very thick-shelled ; No. 4, being a juvenile, is 
almost transparent. 
Example No. 2, which was attached by means of its peduncle to the larger specimen 
(No. 1), is almost covered on its exterior with small coiled Serpule and Polyzoa. The 
marginal portion exhibits curious radiating descending grooves. 
The largest specimen is very similar in general appearance to those obtained by 
the French Antarctic Expedition, figured by OkHLERT (op. cit., pl. 1.). The shell is 
remarkably robust, and, judging from the crowding together of the growth-lines at the 
margins, it is evidently a very old (gerontic) individual (Pl. I. fig. 1). 
The interior of the dorsal valve exhibits a very distinct median septum extending 
a third the length of the valve, as well as strongly marked muscular impressions. 
The brachial support is, unfortunately, somewhat broken (see Pl. I. fig. 3), but sufficient 
remains for comparisons to be made with other forms. 
Outwardly this example presents the appearance of having been bored by an agency 
similar to Cliona or one of the perforating Polyzoa, as the surface of the shell is covered 
with branching vermiform groovings, some of which penetrate to the interior. 
The living example (No. 2), which was attached to the above, has provided material 
for the study of the general characters of the spicule, etc., and I am much indebted 
to Dr F. Brocumann, to whom I submitted this and other examples, for his kindness 
in comparing these with the specimens obtained by the Swedish Expedition at South 
Georgia. 
* Not referred to by BLocHMANN (1912). 
+ From the locality. 
TRANS. ROY. SOC. EDIN., VOL. XLVIII. PART II. (NO. 19). 57 
