1877.] COLLECTION MADE BY H.M.S. ‘ PETEREL.’ 69 
8. ArGyrRiosuS sETIPINNIS (Mitch.). Charles Island (Post- 
Office Bay). 
9. HEMIRAMPHUS UNIFASCIATUS (Ranz.). Charles Island (Post- 
Office Bay). 
This is one of the fishes which appear to extend within the tropics 
almost round the globe; hitherto it has not been brought from the 
West coast of Africa. 
10. Cuupea LiBeRtTatTis (Gthr.). Charles Island (Post-Office 
Bay). 
11. Terropon nerRatpi (Gthr.). Charles Island (Post-Office 
Bay). 
12, Bauisres mitis (Benn.). Charles Island (Post-Office Bay). 
IV. Motuusca. By EnGar Smiru. 
The shells collected by Commander Cookson are all from Charles 
Island. They belong to twenty-two species, the majority of which 
were previously known to have been found in the archipelago, 
though we were ignorant in some instances of the island on which 
they had been obtained. Six of the species are additions to this 
fauna, three of them being apparently undescribed. 
A. Marine Species. 
1. Purpura PATULA, Linn. 
Both the normal form of the species and the variety (P. columel- 
laris, Lamarck) occur at Charles Island. Some of the typical 
specimens with thin lips have the spire quite elevated, indeed quite 
as much so as certain of the variety with the thickened and strongly 
dentate labrum. One of the latter form is quite a curiosity, on ac- 
count of its diminutive size and solidity, being only an inch in Iength 
and yet quite adult. 
2. PurpPURA CALLAOENSIS, Gray. 
The single specimen from Charles Island differs from all Peruvian 
examples I have seen in having four stout lirations within the aper- 
ture, which do not reach to the margin of the labrum ; and the four 
transverse ridges which usually encircle the body-whorl of this 
species are very well developed. The specimens in the Cumingian 
collection are stated to have come from the Galapagos Islands, ac- 
cording to a ticket preserved with them; but Reeve quotes Callao 
Bay as the home of the species. 
3. ENGINA CRocosToma, Reeve. 
This species has been found at Panama ; and the Philippine Islands 
were given by its author as the habitat. 
