1918.] H. H. GoDWiN-AusTKJN- : New Slutj-like Moll uses. 101 



Shell spatulate, coil of apex fine ; sculpture none, surface smooth 

 and shining ; colour ochraceous with a green tinge ; suture short im- 

 pressed ; whorls 1|. 



Size. — Major diameter 15-5 ; minor diameter 9-5 mm. 



Animal (figs. 4 and 5). — Spirit specimen much contracted, 39 mm. 

 in length. Two peri])odal grooves lie above the edge of the foot, the 

 area between them regularly segmented, the segments of the fringed 

 margin extending beneath the foot, but do not cross the median area of 

 the sole of the foot. 



Mucous gland a narrow slit, nearly vertical and very slightly over- 

 hanging above, extremity of foot keeled for a short distance, then 

 rounded as it approaches the shell, the apical part of which rests in a 

 depression. Regular segmental grooves becoming close-set extend 

 from the irregular upper peripodial groove to the keel. 



The right shell lobe is very small, the left extends all round the 

 peristome as a narrow band, leaving much of the shell exposed, a short 

 cicatrix divides them running to the respiratory orifice ; the right dorsal 

 lobe is small, the left is very broad and ample up to the posterior margin. 



The frontal side of the animal (fig. 6), although much contracted, 

 gives an interesting view of the mouth, and shows the segmented sides 

 of the foot and its plain central area. 



Austenia ? dawnaensis, young. 



Locality. — Dawna Hills, Tenasserim {F. H. Graveh/). 



Shell broken by sudden contraction in the spirit, very thin and 

 spatulate. 



Size. — Major diameter 13-0 mm. 



Animal. — Pale coloured, dark on head and neck, and darkish on the 

 forepart of the mantle. 



The margin of the foot is fringed, but the usual grooves above it can- 

 not be discerned, in fact the whole body is quite smooth, from some 

 change, probably after being put into alcohol. Sole of foot similarly 

 quite plain. 



There is a small right shell lobe, while the left shell lobe overlaps the 

 edge of the peristome right round from the respiratory orifice to the left 

 side. The right dorsal lobe is very small, the left very ample. The 

 extremity of the foot is truncate, the mucous gland a narrow slit. 



This specimen may be compared with A. dawnaensis (No. 6063) in 

 its general external characters and may possibly be a young specimen. 



