18 
AUSTRALASIAN ANTARCTIC EXPEDITION. 
PoROLEDA LONGICAUDATA Thiele. 
Leda longicaudala Thiele, Deutsch. Siidpol. Exped. xiii., 1912, p. 229, pi. xvii., fig. 22. 
The sculpture is here stronger than in others of the genus. Large specimens are 
proportionately narrower than small ones, and the species grows larger than hitherto 
recorded, as a specimen from Station II. is 20mm. long, and another from Station X. 
is 21mm. 
Three dredged, December 28th, 1913, in 288 fathoms, ooze, oft' the eastern barrier 
of Adelie Land, in South Lat. 66° 52' and East Long. 145° 30'. Ten, January 28th, 
1914, from 240 fathoms, ooze, off the Shackleton Ice-shelf, in South Lat. 65° 20' and 
East Long. 95° 27'. Four, January 29th, 1914, from 325 fathoms, ooze, off the 
Shackleton Ice-shelf, in South Lat. 64° 44' and East Long. 96° 13'. 
MaLLETIA SABRINA SJ>. UOV. 
(Plate I., figs. 3, 4.) 
Shell moderately solid, oblong, posterior side twice the length of the anterior ; 
dorsal and ventral margins parallel, anterior end rounded ; posterior end obliquely 
truncate; beaks prominent. Valves slightly gaping at each extremity. Epidermis 
thin, continuous, olive yellow. Surface glossy, with an iridescent sheen. Concentrically 
striated, irregularly and faintly for most of the disc, but closely and sharply near the 
umbo. An obscure angle indicates the escutcheon. The hinge has 11 teeth on the 
anterior side and 13 on the posterior. Length, 10-5 ; height, 6 ; breadth of conjoined 
va.ves, 4mm. 
This most southern member of its genus is named in remembrance of an exploring 
vessel, the “ Sabrina,” which disappeared in these seas in 1839. Seven complete 
specimens, including the type, were taken January 29th, 1914, in 325 fathoms, ooze, 
off the Shackleton Ice-shelf, in South Lat. 65° 6' and East Long. 96° 13. Another, 
January 31st, 1914, in 358 fathoms, ooze, off the same glacier, in South Lat. 64° 44' 
and East Long. 97° 28'. Again, a separate valve, December 28th, 1913, in 288 fathoms, 
ooze, off the Mertz Ice Tongue, in South Lat. 66° 55', East Long. 145° 21'. 
Silicula rouchi Lamy. 
Silicula rouchi Lamy, 2nd Exped. Antarct. Fran^, 1911, Moll., p. 30, pi. i., figs. 24, 25. 
Two specimens dredged December 28th, 1913, in 288 fathoms, ooze, off the Eastern 
Barrier of Adelie Land, in South Lat. 66° 55' and East Long. 145° 21'. 
