274 
it and the Purpura decemcostata of Middendorff, from the Icy Sea at 
Behring’s Straits, the place of which it probably takes on the western 
shores of North America. 
Purpura, noy. sp.? A single specimen, to which I abstain giving 
a name, since its characters are intermediate between those of de- 
cemcostata and Freycinetii (a Kamtschatka shell) ; it is probably a 
variety of the former. 
PURPURA FUSCATA, sp. nov. (PI. XI. fig. 13.) 
P. testd oblongd, subturritd, fuscd ; spird brevi; anfractibus con- 
vecis, costis spiralibus (2 in anfractu penultimo) paucis distan- 
tibus subsquamosis cinctis, interstitiis costis obsoletis; aperturd 
dilatatd, columella albidd. 
Long. 1,5, lat. 5%, long. apert. 58 une. 
A species of the Lapillus group. Said to have been taken at the 
Sandwich Islands. 
Among the Purpure in the collection are P. planospira, P. colu- 
mellaris, and P. Carolensis, all Galapagos species, and probably col- 
lected during the visit to those islands. 
Fusus Kexeri, sp. nov. (Pl. IX. fig. 10.) fea4}. 03 
Ff. testd crassd, fusiformi, pyramidatd, anfractibus 9, spiraliter stri- 
atis, angulatis, noduloso-costatis, costis in anfractibus omnibus 8, 
prope suturam obsoletis excavatis appressisque ; anfractu ultimo 
3 teste occupante ; aperturd elongato-pyriformi, superné angulatd ; 
inferné canali obliquo plus 3 aperture equante ; labro columellari, 
reflexo, incrassato, labro externo attenuato, subdenticulato ; caudd 
incrassatd, contortd, reflerd ; colore sordide albido, ore albo. 
Long. 35 unc. ; lat. max. anfr. ult. 1,2; unc. ; long. apert. 23 une. ; 
long. caud. 52. ; 
This remarkable shell was taken on the Californian coast, and is 
very distinct from any known Fusus. In general aspect it closely 
resembles a Fasciolaria, reminding us strongly of the European Fas- 
ciolaria tarentina, but is greatly larger and has uo plaits on the 
pillar lip. The strize which wind round the whorls are grouped in 
twos and threes. They become very strongly marked and assume 
the character of sulcations on the caudal portion of the body whorl. 
The ribs are mainly developed a little above the centre on the angu- 
lated portion of the body whorl and on the lower halves of the upper 
whorls, so prominently as to appear like large tubercles. 
I have dedicated this unique shell to the eminent conductor of this 
important expedition. 
Fusus Oregonensis was taken on the Californian coast, and F. sale- 
brosus on the coast of Mazatlan. 
4. ON THE GENUS ApTERYX. By A. D. Bartuetr. 
(Aves, Pl. XXX. XXXI.) 
In calling the attention of the Meeting this evening to the large 
collection of specimens of the genus dpteryx on the table, I beg to 
state that I have been led to make a careful examination of all the 
