223 



live upon the trunks of trees or under fallen leaves. None of the South 

 American types have any representatives in Central America. There is, 

 however, a single species in Honduras, B. Kieneri, belonging to a singular 

 Cyclostoma -like type, which belongs evidently to Jamaica, where it is re- 

 presented by B. Gossei, turricula, vmcannatus, cylindricus, and Guildingii. 

 In Mexico the Bull mi are more varied. Eive species, B. Mexicanus, 

 serperastrus, livescens, Humboldtii, and nitelinus, in which the shell is of 

 a light, brittle structure, oblong form, and simply dark-banded, belong to 

 a type quite peculiar to this locality, extending in B. Californicus to the 

 opposite peninsula. At Vera Cruz, on the eastern side of Mexico, a 

 Bolivian type appears in B. Lattrei, Jonasi, and fenestratus. A very re- 

 markable type is presented in the Mexican B. Domheyanus, which is at 

 present unique. B. labiatus and Schiedianus, which are almost colourless, 

 partake of the typical character of B. confinis and liquabiUs inhabiting 

 Texas, and of B. dealbatus inhabiting Alabama, which is the most northern 

 species of the genus in this hemisphere. 



6. Islands of the Western Hemisphere. 



The terrestrial conchology of the islands of the western hemisphere is 

 for the most part typically distinct from that of the continent, and the 

 more so in each particular group of islands in proportion to their distance 

 from the main-land. This receding gradation of types is distinctly shown 

 in the Bulimi of the Great and Little Antilles. In the first group of 

 islands this genus has but a meagre share in the conchology, which com- 

 prises more of Cyclostomata. In the latter group the Bulimi, passing 

 southward, are gradually larger and more painted, and exhibit a relation- 

 ship with those of the neighbouring continent. Jamaica, Cuba, and Tor- 

 tola yield a few species of the Cyclostoma type, B. Gossei, turricula, etc., 

 just spoken of as appearing at Honduras in B. Kieneri; but there are 

 more of the ground-burrowing glassy type, such as B. subnla, octonoides, 

 Goodhalli, and pauperculus inhabiting the savannahs. B. immaculatus is 

 a rather large species, and B. mirabilis, remarkable for its squamate growth, 

 is quite unique as a type. In Guadaloupe and Martinique, connecting 

 the leeward and windward of the West India Islands, a' few species 

 occur with shells of darker and more solid growth, as B. Guadaloupensis, 

 Martinicensis, and chrysalis. In the principal islands of the Little An- 

 tilles approximating to the South American continent, the Bulimi increase 

 in size and colouring, gliding distinctly into the types of the Venezuelan 

 province. The richly painted B.fulminans and Blainvilleanus of Merida 

 are represented in the island of St. Vincent by B. auris-Sileni ; the deli- 

 cate B. rosealus and xauthostoma of Bogota by B. stramineus and Vincen- 

 tinus in the same island ; and B. glaber, a robust species of Trinidad, is re- 

 presented in the nearest main-land of Venezuela by B. distortus and eury- 

 omphalus, and in New Granada by B.perdix. 



