398 
: 
T 
= 
E 
E: 
E 
i 
rs dark. Inside white, slits one, ill defined, 
and placed far back on the insertion plate, suture broad. 2 
Hab.—Marino, South Australia. Collected by myself ; 
d. i 
Measurement.—T7 mm. x 3 mm. i 
Remarks.--This beautiful and striking Acanthochiton 1s 
easily distinguished from any known species by the row of 
exceptionally large milk-white pustules suggesting a row of 
rounded teeth set in a jaw, present in the median valve. The 
ACANTHOCHITON GATLIFFI, n. sp. 
Pl. xlii., figs. 2 to 5. 
a 
bd 
Anterior valve.—Five rays or undulations, the whole 
the median valves. Inside and insertion plates deep pink, 
five slits, teeth sharp. : 
‘Posterior valve.—Very small, mucro slightly posterior, 
dorsal area wedge-shaped but smaller in proportion than the 
other valves. The portion of shell to the front of the mucro 
is ornamented with a few large flat pustules in two rows, pes 
posterior portion of valve decorated towards its margin with 
of l granules. Inside pink, slits three, the 
plates are produced posteriorly for a width almos 
t the exposed portion of valve, sutural laminae 
si an unusual degree almost forming 
- 
