404 MANUAL OF THE MOLLUSCA. 



angular mouth, [Goniostomtcs, Beck,) and the pupiform species, with a 

 toothed aperture, {Odojitostonms,) are characteristic of this region, and also 

 some of the most elongated forms, ( Obeliscus). The lamp snails {Anastoma) 

 and 2Iegaspira, genera inhabiting France during the Eocene period, are now 

 peculiar to Brazil : Simpulopsis is also peculiar, and Streptaxis attains its 

 maximum there. The Cyclostomida are few, and the other W. Indian forms 

 have almost disappeared. 



The land slugs are Peltella palliolum, Vaginulus solea, and Limax 

 andicolus. The fresh-waters of the interior are rich in bivalves of peculiar 

 genera ;* — 



Physa 1 Ampullaria 2 Unio 4 



Aucylus 1 Corbicula 2 Iridiua 1 



Planorliis 4 Pisidium 1 Hyria 1 



Paludestrina 2 Anodou 1 Castalia 2 



Marisa 1 Monocondyltea 1 Mycetopus 3 



24. Peruvian Region. 

 The long and narrow tract between the Andes and Pacific, extending from 

 the equator to 25° S. lat. forms a distinct, though comparatively unproductive 

 province, including the coast of Ecuador, Peru and Bolivia. It is warm and 

 almost rainless ; the clouds discharge themselves on the east side of the \ 

 Andes, and rain is so rare on the west coast that in some parts it only falls 

 two or three times in a century. In Peru, during great part of the year, a •■! 

 vapour rises in the morning, called the"garua;" it disappears soon after ': 

 mid-day, and is followed by heavy dews at night. 



Mr. Cuming collected 46 species of land snails in Peru ; and Dr. Pfeiflfer i 

 enumerates 100, but perhaps half the latter were from the eastern side of the ; 

 Andes, belonging to the Brazilian Province. They are mostly Bulimi, and I 

 are smaller and less richly coloured than those of Bolivia and Brazil; | 

 B. Benickei, solutus, and turrltiis are peculiar forms. Cistula Delatreana 

 is the only operculated land snail, and Vaginulus limayanus the only slug. \ 



Ancylus 1 | 



Ampullaria 1 



Paludestrina 2 I 



Cyrena 3 j 



Anodon \\ 



25. Argentine Region. 

 The "region of arborescent Compositse" has afforded scarcely any land 



* The American Expedition explored 40 Brazilian streams, and found only 

 1 Ampullaria, 1 Melania, and 1 Planorbis. — (Gould.) 



