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of rats, which feed upon the pulp of the berry. Their numbers 

 were formerly restrained by the employment of rat-catchers on 

 the coffee estates. Since the emancipation of the slaves, this 

 occupation has been neglected, and the vermin have multiplied 

 to an astonishing degree. Not content with their usual domestic 

 ravages, and the destruction of ripening coffee, they destroy vast 

 numbers of land-moUusks. The shells are found in a fresh state, 

 but with a hole nibbled in one of the whorls for the extraction of 

 the animal. Of a majority of species of Cyclosioma and Heli- 

 cina, and of several of Helix, which occurred abundantly at Rio 

 Bueno, four fifths of the fresh specimens had been destroyed in 

 this way. As the older shells, which had begun to decompose, 

 were entire, it may be inferred that this agency is of recent date. 



Among the notices of the habits of the terrestrial species, Prof. 

 A. mentions the activity with which they move, and the rapidity 

 with which they climb the trees during wet weather, as something 

 that astonishes persons accustomed to the sluggish motions of the 

 species of northern latitudes. The semi-maritime habits of some 

 of the species are noticed. Cyclostoma maritimum and Helicina 

 costata are examples. Both occur at the water-side, within reach 

 of the spray, and the latter under stones thrown up by the sea. 

 The first is rarely, and the latter apparently never, found in the 

 interior. The species most nearly associated with the latter, in 

 habit, is Litiorina muricata. 



Prof. Adams enumerates the following species, natives of New 

 England, as existing also in Jamaica, viz., Buccinum vibex, Say, 

 Cerithium terebrale, Limnea umhilicata. Helix chersina, Pupa 

 contracta, Pupa rupicola, Modiola harhata, Lucina divaricata. 



The following is an abstract of the genera, and of the number 

 of species of each, described in this paper. A remarkable 

 feature in it is the total absence of the Naiades. The arrange- 

 ment, here given, is alphabetical. 



Acasta, 1. Achatina, 8. Amphidesma, 2. Ampullaria, 1. 

 Anatifa, 2. Ancylus, 1. Anomia, 1. Area, 9. Auricula, 4. 

 Avicula, 2. Balanus, 3. Buccinum, 8. Bulimus, 8. Bulla, 4. 

 Calyptrea, 1. Cardita, 1. Cardium, 1. Cassis, 1. Cassidaria, 1. 

 Cerithium, 14. Chama, 1. Chemnitzia, 2. Chiton, 11. Conia, 

 1. Conus, 3. Crepidula, 2. Cyclostoma, 21. Cylindrella, 9. 

 Cypraa, 6. Cytherea, 4. Dolium, 2. Donax, 2. Emarginula, 1. 



