On the Shells of the Louisiade Archipelago. 199 
XXII.—On the Land- and Freshwater- Shells of the Louisiade 
Archipelago. By EnGar A. SMITH. 
[Plate XIII. } 
Tue British Museum has recently received from Mr. Basil 
Thomson a very interesting collection of land- and freshwater- 
shells made by him in some of the islands of the Louisiade 
Archipelago. In naming these specimens it has been neces- 
sary to study what has been written upon the shell-fauna of 
these islands, and I have thus got together a complete list of 
the known species *. 
The first and only collections of any extent from this locality 
which have come to Europe were those made by MacGilli- 
vray during the voyage of the ‘ Rattlesnake’ in May, June, 
and July 1849. 
Most of the species proved to be new, and the majority 
were described and figured by Forbes in the second volume 
of MacGillivray’s narrative of the voyage. 
About half a dozen additional new forms have since been 
described by Pfeiffer, Cox, Angas, and H. Adams. 
The present collection consists of fourteen species of terrestrial 
forms, ten of which are new, and nine freshwater species. 
The most important discovery made by Mr. Thomson is that 
of the four new species of Pupinella, one among them beingstill 
larger than the P. grandis of Forbes. They are remarkable 
in presenting curious modifications in the labial slit or notch ; 
indeed in two of them this feature is so abnormal that it might 
almost be considered of subgeneric importance. Mr. Gwat- 
kin, however, who has kindly examined the radula of P. Mac- 
gregori and P, rosseliana, observes: ‘there is certainly nothing 
in the radula to call for subgeneric distinction.” 
Fifteen land-shells have already been recorded from the 
Louisiade Islands, and Mr. Thomson has now added eleven 
others, making, together with three forms collected by Mac- 
Gillivray and not recorded by Forbes, a total of twenty-nine. 
With the exception of the Auriculide and of Helix Boyeri 
and H. coniformis, about the locality of which there is some 
doubt, all the species are peculiar to these islands. 
Of freshwater forms only a single species has hitherto been 
noticed, namely Neritina diadema. I now enumerate fifteen 
* With the exception of Nos. 9,11, 12, and 14, all the species are in 
the Museum. 
