106 MANUAL OF THE MOLLUSCA. 
(Taheitana) Neritina, and Navicella; the two last being often 
littoral, or even marine, in their habit. 
Low Coral Islands. 
The Atolls, or lagoon-islands, are less prolific: 2 Helices and 
2 Partule are found at Oualan, in the Caroline Archipelago ; 
and from Chain Island (Annaa), the centre of commerce in the 
eastern Archipelago, have been obtained—Heliz 2 sp., Nanina 1, 
Partula 1, Tornatellina 1, Cyclophorus 1, and Melampus mucro- 
NAtUS. 
Sandwich Islands. 
The land shells of these islands exceed 200, and are all, or 
nearly all, peculiar: there is one Zimaw ; and in the fresh waters 
are found Limnwa volutatrix, Physa reticulata (Gould), Neritopsis ? 
Neritina Nuttalli and wndata, and Unio contradens (Lea). 
In the I. Kaui, two species of Achatina have been found: 
the Achatinelle are elongated (Leptachatina, G.) and the Helices 
planorboid and multispiral. In Molokai the Achatinelle are 
large and coloured. In Maui and Oahu the Helices are small 
and glabrous, or hispid, ribbed, and toothed. In Hawaii, Suc- 
cineas prevail, and Achatinellae are rare. (Gould.) The large 
number of Achatinellae is partly due to this group having been 
specially studied by Judge Cooper of America. 
HTGIEK Ie pratense coreenss 20 ACh atinameescedcsce ses 5 PUPA. sserseenteecseneoee 2 
IN AMIN Vee.caccssecsceses 3} Achatinellagzessccssseee 204 Witrins: escun seeseeeee 2 
PS TTINUS soesec sc. cccoes ees 5 Tornatellina ............ 3 SUCCINGA | -eeccesewesenee 10 
PALL Ais cccee wt oetectee 4 Bald stosncveteescneseasee 1 ELeCing) s.esseeseeseeere 6 
The Island of Guam, Ladrones, has 3 sp. of Partula, 2 of 
Achatinella, and 1 Omphalotropis. At the Marquesas haye been 
found 3 sp. of Nanina, 1 Partula, and 1 Helicina. 
NEW WORLD. 
16. CANADIAN REGION. 
The country drained by the Great Lakes and the river St. 
Lawrence possesses very few peculiar shells, and these mostly 
of fresh-water genera. It is chiefly remarkable for the presence 
of afew European species, which strengthen the evidence before 
alluded to (p. 60) of a land-way across the north Atlantic 
haying remained till after the epoch of the existing animals and 
plants.* 
* For example, the common Heather ( Calluna vulgaris), one of the most abundant 
soca. plants of Europe, characteristic of the moorland zone, and seldom rising above 
