183 
ceiving the iiihalent current. Head differentiated ; eyes dis- 
tinct, on outer bases of tentacles, which are flattish cylindri- 
cal. Foot truncated, horizontally slit, and dilated laterally 
in front ; bluntly pointed behind : tail free. Renal aperture 
on the right, the mantle-border slightly grooved outward 
from this spot- Dentition, 2-1 rr2. Mandibles corneous, 
strong. 
Shell. — Internal, "heliciform, imperforate oval, orbicu- 
lar, thin, invested by a thin epidermis, which extends beyond 
the lip r^ spire much depressed, sub-lateral ; whorls few, 
rapidly increasing ; aperture oblique, rather large, the extre- 
mities of the simple lip un'ted by a callus extending widely 
up n the whorl." 
Tfah. — New Caledonia and South Australia. 
Caledoniella contusiformis, spec. nov. 
Plate xxviii., fig. 1, and Plate xxix., figs. 1 to 8. 
A mtnal. — Body ovoid, large. Dorsal shield soft, verru- 
cose, and wrinkled ; drawn in along the sides, the head and 
foot being unprotected when in motion, but capable of being 
retracted under the shield, which closes over them securely. 
Foot flat ; extended laterally, and slit Lorizontally in front ; 
the tail and head being free to move, and connected to the 
main body by a comparatively narrow trunk. Mouth large, 
from underneath the strong muscular rim of which the ser- 
rated edges of the jaws are visible. Dentition, formula 
2'ri'l'2. ; central tooth sub-quadrangular, minutely and multi- 
cuspidated, laterals at least bicuspid, marginals noticeably 
narrower than the laterals, strongly hamate. Mandibles 
strong, elongate, wing-shaped, horny ; obliquely striate ; outer 
edge sharply serrate ; a prominent ridge marking off the serra- 
tion, beneath which a narrow band of setae. Colour : The 
wrinkled dorsal shield is of an impure white to light brown 
ground-colour, which in the valleys of the wrinkles appears 
of a deeper hue. Large black, easily detachable blotches 
cover the surface, without system in their arrangement : they 
are each surrounded by a rim of deeper brown, and, at some 
distance from their edge, by a ring of similar colour : the 
underside of the shield is light flesh-red. Foot and head 
brownish-red, the edge of the dilated front of the former, and 
the tips of the tentacles of the latter, black. Dimensions : 
Length, 40; breadth, 30; height, 25 mm.; length of foot, 
25 mm. 
SheU. — Very tliin, globose, ellipsoid, heliciform; about 
three whorls, rapidly increasing in size ; spire small, depressed ; 
* As a generic character I do not attach much importance 
to this feature. 
