The Cambridge natural history . ral America is remarkablefor an immense number of large carni-vorous Mollusca possessing shells. Thereare 49 species of Glandina, the bulk ofwhich occur in eastern and southernMexico; 3 6 of Streptostyla ( Mexicoand Guatemala, only 1 species reachingVenezuela and another Peru); 5 of Sala-siella, 2 of Petenia, and 1 of Strehelict; thelast three genera being peculiar. Strept-axis, fairly common in S. America, doesnot occur. Velifera and Cryptostracon,two remarkable slug-like forms, each witha single species, are peculiar to Costa the especial peculi
The Cambridge natural history . ral America is remarkablefor an immense number of large carni-vorous Mollusca possessing shells. Thereare 49 species of Glandina, the bulk ofwhich occur in eastern and southernMexico; 3 6 of Streptostyla ( Mexicoand Guatemala, only 1 species reachingVenezuela and another Peru); 5 of Sala-siella, 2 of Petenia, and 1 of Strehelict; thelast three genera being peculiar. Strept-axis, fairly common in S. America, doesnot occur. Velifera and Cryptostracon,two remarkable slug-like forms, each witha single species, are peculiar to Costa the especial peculiarities of the fig. 232. — Examples ofregion are the giant forms belonging to the Mexican » ^ ° Mollusca: A, Coelorcn- Cylindrellidae, which are known as Holo- trum turris Pfr. ; b,spira, Eucalodium, and Coelocentrum (Fig. Si>xj,tostijia Ddattrei232). They are almost entirely peculiar to Mexico, only 7 out of a total of 33 reaching south of thatdistrict, and only 1 not occurring in it at all. VOL. Ill 2 A. 354 CENTRAL AMERICA The land operciilates are but scanty. Tomocydus and Amjjhi-cyclotus are peculiar, and Schasicheila, a form of Helicina, occurselsewhere only in the Bahamas. Geres (see Fig. 18, C, p. 21) andProserpinella, two remarkable forms of non-operculate Helicinidae(compare the Chinese Hcudeia), are c[uite peculiar. Pachychilus,one of the characteristic fresh-water genera, belongs to the (Melaniidae) type, not to the N. American (Pleuro-ceridae). Among the fresh-water Pulmonata, the Aplecta areremarkable for their great size and beauty. In the accompany-ing table Mexico is to be taken as including the region fromthe United States border up to and including the isthmus ofTehuantepec, and Central America as the whole region soutliof that point. Land Mollusca of Central America oo S o o ^1 25 -M * ? ^o s . c 0 g c a — - ig S = si J^ ?Z<o r=i O-^ 0 00 Strebelia 1 lierendtia 1 Glaiidiiia 33 13 3 6 3 3 Salasiella 4
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
