558 



Page. 



70 



Sp. 



16 



rs 21. 



BEPORT — 1 863. 



Var. a. pemmtn,= V. marr/aritarum, Val. Ven. pi. 11. f. 2. (fig. min.), 

 Cal Mus Cum. [Affiliated to the Californian species on supposi- 

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

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

 tThylacodes oryzata, Morch. Probably W. Central America, from the 

 adhesions; but "China: " Mus. Cum. 

 , . . . Var. ». annulatct. Panama. Mus. Cum.* 



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

 trial and Fluviatile 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 nevr species 

 show close generic afSnities with the shells of the northern .regions of S. 

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

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



Fie; 



miix GMeshregUi, Nyst. The largest Helix in the New "World. 



Helix eximia, Pfr. 



Helix Lalliana, Pfr., var. 



Helix, euryomphala, Pfr. Closely allied to the S. American 



H. laxata. 

 Helix coactiliata, F^r. 

 Bulimus Pazianus, D Orb. 

 lliilimus Moricandi, Pl'r. 

 Bulimus Honduratianus, Pfr. 

 Bidimus Dysoni, Pfr. 

 Bulimus semipellucidm, n. s. 

 Succinea fputris, Ln. 

 Olmidina Ghieshreghti, Pfr. 

 Glandina Carminensis, Morelet. 

 Achatina, sp. ind. 

 Achatina ocfona, Lam. 

 Spiraxis Lattrd, Pfr. 

 Spiraxis Shuttlewortkii, Pfc. 

 Spiraxis Cobanensis, n. s. 

 Spiraxis, sp. ind. 

 Leptinaria Emmelin^, n. s. 

 Leptinaria Bliscg, n. s. 

 Cylindrella Ghieshreghti, Pfr 

 Cylmdrella Salpinx, n. s. 

 Physa Soicerbyana., D'Orb. 

 Physa purpurostoma, n. o. Lake of DueSas. 

 Planorhis corpidentus, Say. 



Planorbis tmnidus, Pfr. [Comp. P. tumem, Maz. Cat. 238.] 

 Planm-bis Wijldi, n. sp. Lake of Duenas. 

 Planorbis Duenasianus, n. s. Lake of Duenas. 

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

 Segmentina Donbilli, n. s. Lake of Duenas. 

 Melampus fasciatus, Chem. Salt-marshes on coast. 

 Adamsiella Osberti, n. s. 



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

 rate paper, which few naturahsts 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. spiuosa." The shell described in Maz. Cat. p. 307 is quoted as " Vermetm 

 {Thylacodus) contortus, var. y. conlortula {Thylaeodus), forma 1, Thylocodus (?) con' 

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

 more easy to understand and remember. The Chitonidce of Middendorff (p. ju'st Eeport, 

 p. 214) are simple in comparison, 



44 



Allied to B. discrepans, Sby. 



Described from Costa Pdca. 



