Hurron.—On some Branchiate Gastropoda. 129 
PATELLA arcyropsis, Lesson (=P. radians, Gml). Plate XVI., fig. x. 
Dentition.—Inner teeth simple, pointed; outer with two denticulations 
on the outer side, the lower sometimes semi-detached, more often rect- 
angular; central plate lenticular, divided longitudinally; marginal plates 
like those of P. olivacea, but the posterior margins smooth, and the inter- 
mediate plate sometimes hooked. 
The specimen figured was collected at Lyttelton. P. pholidota, Lesson, 
has the same dentition, and can only be considered as a variety. 
CHITON PELLIS-SERPENTIS, Quoy and Gaimard. Pl. XVI., fig. 1. 
Dentition.—7-1-7. Central tooth with a narrow neck and expanded 
base like some of the Trochide, the reflexed portion without cutting-points. 
Firstlaterallike the central, but longer. Second lateral placed obliquely 
with a long stalk and an opaque blunt cutting-point like Nerita. First 
marginal trilobed : second with a projecting anterior process from the 
inner angle of which proceeds a peltate tooth on a long stalk: third and 
fourth marginals oval; the fifth subquadrate. 
The specimen figured was collected at Lyttelton. 
Curros enavcus, Gray. Pl. XVI., fig. F 
Dentition—7-1-7. Central tooth spoon-shaped ; first lateral like Tro- 
chide, with an unarmed reflexed portion: second lateral ovate with a large 
claw-shaped cutting-point on the anterior end, and an accessory plate below 
it: first and second marginals irregular: the third subtriangular, with a 
large ladle-shaped tooth arising from the inner side: fourth suboval; fifth 
subquadrate. 
The specimen figured was collected at Dunedin. 
ACANTHOCHITES ZEALANDICUS, Quoy and Gaimard. Pl. XVI., fig. c. 
Dentition.—6—-1—6. Central tooth quadrate, the reflexed portion with- 
out eutting-points: first lateral like the central but smaller: second lateral 
oblique, with a long stem and a recurved portion bearing three opaque 
dark-brown cutting-points: first marginal sub-quadrate; second, third, and 
fourth oval; from between the first marginal plates springs a spoon-shaped 
tooth. 
The specimen figured was collected at Dunedin. 
OnvProcowcHus porosus, Burrow. Pl. XVI., fig. n. 
Dentition.—6-1-6. Central tooth subquadrate, longer than broad, with 
a simple reflexed portion: first lateral curved round the central, the front 
portion reflexed : second lateral oblique, the stalk broad and rather sigmoid, 
the reflexed portion bearing three dark-brown opaque cutting-points: mar- 
ginals ovate: from the first marginal there arises a spoon-shaped process, 
and from the second a large faleate process. 
The specimen figured was collected at Lyttelton. 
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