548 rnoF. c. h. o donoghue : report on 
A similar series of marlvings is present on the under surface of the mantle. 
Tbe foot is slightly lighter in colour and speckled with dark brownish-black 
spots. 
Dimensions. The largest specimen measured 52 mm. long by 34 mm. wide 
and 23'5 mm. high. The foot measured 42 mm. long by 16'5 mm. wide. 
Thus it is larger than Bergh's specimen of A. marmorata (45 by 25 by 13 mm.), 
and considerably larger than the measurements''given by Basedow and Hedley 
(22-5 by 10 mm.). 
Head. The inconspicuous head is very small and tucked in between the 
front margin of the foot and the large overhanging mantle. The mouth 
appears as a tiny longitudinal slit, and the oral tentacles are sub-cylindrical 
and when contracted measure 1'75 mm. 
Foot. The foot is elongated and narrow ; the front end deeply bilabiate 
and rounded ; the hinder end bluntly pointed and in the specimen not quite 
reaching to the edge of the mantle. 
Rhinopliores. The rhinophores are club-shaped, and the perfoliate clavus 
occupies almost three-quarters of their length. They are completely 
retractile within cavities with a circular, slightlj^ raised aperture. 
Sranchiw. The branchiae were six in number. Basedow and Hedlej' (8) 
state that they were seven or eight, but show only six in their figure. They 
are retractile within a cavity which opens by a raised, transversely oval 
aperture with a wavy margin. 
The anal papilla lies within the circle of gills ; it is low and bears the renal 
aperture on its right anterior base. 
Eadula. The radula is well developed, and when removed and flattened 
measured 6 mm. along the middle line and 5"5 mm. at its widest point. The 
total number of rows in the radula was 33-35 and the rows contained : — the 
first row 6. 0. 6 (i. e., 12) teeth ; the tenth row 55. 0. 55 (i. e., 110) teeth ; and 
the thirtieth row 57. 0. 57 {i. e., 114) teeth. The innermost pleural teeth are 
small, and consist of a curved spine on an elongated basal plate. They 
increase very markedly in size to beyond the middle of the row, where they 
are falciform, and then they decrease again towards the outside. No sign 
of denticles was found on the lateral teeth. 
Labial Armature. None was noticed. 
The glans penis is armed with a series of rows of hooks. 
The hermaphrodite gland is discrete and does not form a layer over the 
liver. 
JSfotes. The collection included three specimens. One small one from 
Pelsart Island and the other two larger ones with no definite locality-label. 
The specimens described by Basedow and Hedley (8, pp. 139 and 152) are 
from St. Vincent's Gulf and Port River, South Australia, and from Edith- 
burgh, York Peninsula. It has been noted that the specimens here measured 
are considerably larger than those measured by Basedow and Hedley. 
