FISHES, ETC. OF THE ' NASSAU' VOYAGE. 485 
distinct from the Æolidea patagonica, D'Orb. The mantle was of a beautiful pale rose-pink 
hue, slightly freckled with pale chocolate-brown. The foot was also pale rose-pink, having 
a pale bluish hyaline appearance at the edges. The branchial tufts were pale pink, with 
their central ramifications chocolate-brown. I dedicate this species to Dr. S. Campbell, 
R.N., late Surgeon of H. M. $. * Nassau,” to whom I was greatly indebted for much kind 
. assistance in the collecting and preserving of specimens. 
PTEROPODA. 
102. PNEUMODERMON PERONIT, Cuv. 
A number of specimens of this species were taken, in the kis disk, between St. Vin- 
cent and Rio Janeiro in October 1866. 
103. CLEODORA PYRAMIDATA, Linn. 
This species was taken, in the towing-net, between the river Plate and the Strait of 
Magellan in November 1867. 
104. CuvrERIA COLUMELLA, Rang. 
Taken in the towing-net, along with Cleodora pyramidata, in November 1867. 
LAMELLIBRANCHIATA. 
; OSTREIDÆ. 
105. OSTREA CHILENSIS, Ph. 
This species is very abundant in the Bay of San Carlos de Ancud (Chiloe). 
106. PECTEN PURPURATUS, Lam. 
~ Common in the Bay of Coquimbo. 
107. PECTEN PATAGONICUS, King. 
This species is common in the Strait of Magellan. 
108. PECTEN NATANS, Ph. 
This beautiful little species, the valves of which are so transparent that the body may 
be as clearly seen through them as though it was surrounded by an envelope of tale or 
mica, is very abundant on the growing fronds of the kelp (Macrocystis) in the Strait of 
Magellan, skipping actively about by opening and closing its valves. 
109. Pecren Darwini, Reeve? 
Dead valves of a Pecten, probably referable to this species, were found at the Otter 
Islands in Smyth's Channel. 
110. Lima premma, Ph. 
A few — of this elegant little species were dredged in the Strait of Magellan. 
