558 BEPORT 18G3. 



Page, gp. 



70 1(3 Yar. a. pcnnafa,-=- V. mar gar if arum, Val. Yen. pi. 11. f. 2. (fig. min.), 

 Cal. Mas. Cum. [Affiliated to_the Californian species on supposi- 

 titious evidence, and probably distinct. These appear to be from the 

 tropical fauna.] Analogue of the W. Indian T. decussatus, Gmel. 



73 21. ?Thylacodes oryzata, Morch. Probably W. Central America, from the 

 adhesions; but "China: " Mus. Cum. 



, . . . Var. at,, annulata. Panama. Mus. Cum.* 



In P.Z.S. 1861, pp. 229-233, is given a " Catalogue of a Collection of Terres- 

 trial and Eluviatile Molluscs, made by 0. Salvin, Esq., M.A., in Guatemala: 

 ~y the Eev. H. B. Tristram." But few of the 49 species occur in Mexican 

 collections ; none are identical with "W. Indian species, except such as 

 are of universal occurrence in tropical America ; and the 16 new species 

 show close generic affinities with, the shells of the northern regions of S. 

 America. The shells have been identified from the Cumingian celieetion. 

 The new species are described, and some of them figured. 



Page. No. PL Fig: 



230 1 .... Helix GhiesbregUi, Nyst. The largest Helix in the New World. 

 2 . . . . He 1 ix eximia, Pfr. 



. 3 . . . . Helix LalU ana, Pfr., var. 



. 4 . . . . Helix eun/omphala, Pfr. Closely allied to the S. American 

 //. taxata. 



5 . . . . Helix coactiliata, Fer. 



6 . . . . SvUmus Pazianus, D'Orb. 



7 . . . . Bulimus Moricandi, Pfr. 



. . 8 . . Bulimus Hondiiratianus, Pfr. 



9 . . Bnlimus Dysoni, Pfr. 



10 26 8. Bulimus semipeUucidus, n. s. Allied to B. discrepctns, Sby. 



. . 11 . . . . Succinea ?putris, Ln. 



. . 12 . . . . Glandina Ghiesbreghti, Pfr. 



13 . . . . Glandina Carminensis, Morelet. Described from Costa Rica. 



. . 14 . . . . Achatina, sp. ind. 



. . 15 . . . . Achatina octona, Lam. 



. . 16 . . . . Spiraxis Lattrei, Pfr. 



17 . . . . Spiraxis Shuttleworthii, Pfr. 



231 18 . . . . Spiraxis Cobanensis, n. s. 

 19 . . . . Spiraxis, sp. ind. 



. . 20 . . . . Leptinaria Emmelince, n. s. 



21 . . . . Leptinaria Elisa, n. s. 



. . 22 . . . . Cylindretta Ghiesbregliti, Pfr 



. . 23 . . . . Cyhndrella Salpinx, n. s. 



. 24 . . . . Physa Sowerbyana, D'Orb. 



.. 25 .. .. Physa purpurostoma, n. s. Lake of Duenas. 



26 . . . . Planorbis corpulentus, Say. 



232 27 . . .. Planorbis tmnidus, Pfr. [Comp. P. tumens, Maz. Cat. 238.] . 



28 . * . . Planorbis Wyldi, n. sp. Lake of Duenas. 



29 . . . . Planorbis Duenasianm, n. s. Lake of Duenas. 

 . . 30 . . . . Planorbis, sp. nov., in Mus. Cum. 



. . 31 . . . . Segmentina Donbilli, n. s. Lake of Duenas. 



.. 32 .. .. Melampus fasciatus, Chem. Salt-marshes on coast. 



. . 33 . . . . Adamsiella Osberti, n. s. 



* The present posture of binomial nomenclature is well illustrated in this most elabo- 

 rate paper, which few naturalists have professed to understand. The shell of which tha 

 operculum-spine is figured in plate 25. f. 16, is quoted as " Siphonium (Stoa) subcre- 

 natum, v. spinosa" The shell described in Maz. Cat. p. 307 is quoted as " Vermetus 

 (Thylacodus) contortus, var. y. contortula (Thylacodus}, forma 1, Thylocodus (?) con- 

 tortux, var. indentata, Cpr." Perhaps the sentences of Klein and the early writers are 

 more easy to understand and remember. The Chilonida of Middendorff (v . First Keport, 

 p. 214) are simple in comparison, 



44 



