16 AUSTRALASIAN ANTARCTIC EXPEDITION, 
The loop unfortunately was broken before examination, but appears to have 
been short and moderately broad. The crura are very short, and the crural bases of 
moderate length, diverging rather rapidly, their free edges not raised above (ventrally 
of) the hinge plates, which are narrow. The cardinal process is small, low and trans- 
verse. The median septum is very slender, but is well defined and shows clearly on 
the exterior of the shell. 
The mantle and the body walls appear to be free of spicules, while those in the 
arms are slender but exceedingly numerous. The long cirri of both inner and outer 
rows contain rather short and very irregularly bounded spicules in great numbers. The 
place of the cirri socles is taken by small crowded spicules of very irregular shape which 
penetrate into the bases of the cirri of the outer row, but not into those of the inner row. 
The main plates are slender and very irregularly branched, and are confined to the 
dorsal side of the arms. 
Spicules are recorded as being absent from the cirri of Liothyrina arctica, [iothy- 
rella wa, and L. blochmanni, and present in Lnothyrina vitrea, L. affinis, L. stearnsi, 
L. moseleyi and Liothyrella fulva. In other respects the spicules of the arms of the 
present species differ widely from those of the five last named species, being perhaps 
most like those of LZ. moseleyi, but differing in that the main plates are confined to the 
dorsal sides of the arms. The shell resembles in beak characters the type of [dothyrella 
fulva, but is broader than that species, and also differs in its truncate front margin. In 
this respect it resembles Terebratula moseleyi Davidson, but it is less broad than that 
species. It approaches in shape very closely some examples of Liothyrella tateana 
(Tenison-Woods) from the Tertiary of Table Cape, Tasmania, but has a less advanced 
beak, the foramen being labiate in the latter species. L. tateana, moreover, attains a 
more pronounced biplication in many specimens, while in the uniplicate stage it is more 
strongly folded. 
LIOTHYRELLA ANTARCTICA (Blochmann.) 
(Plate XV, figs. 8, 9, plate XVIII, figs. 65, 66.) 
1906. Lirothyrina antarctica Blochmann, Zool. Anz., Bd. XXX, pp. 692-693, 
fig. 1. 
1911. Liothyrina antaretica Kichler, Deutsche Siidpolar-Exped., Zool., Bd. 
IV, Heft. IV, pp. 386-388, 397-400, Taf. XLII, figs. 14, Taf. XLIII, 
figs. 13, 19, 20, Taf. XLIV, figs. 25-34. 
Habitat.—Station 2 ; lat. 66° 55’ 8., long. 145° 21’ KE. (off Adelie Land), 288-300 
fathoms, 28th December, 1913. Sea-bottom, ooze; temperature 1-8° C. 
A small series of specimens from Station 2 is ascribed to this species with some 
confidence, not only because of the general agreement in shell characters, but also on 
account of the close resemblance of the spicules to those of L. antarctica described by 
Kichler. The following description applies to the largest specimen of the series. 
