558 KtroKT— 18G3. 



P»Ke. Sp. . . , ' 



76 IG Var. a. ponnnfa.=i V. mnrgarifanim, Val. Vcn. pi. 11. f. 2. Cfic". Tnin.\ 

 Cal. MiK^. Cum. [AiKliated to the Calit'oniiaii .'•pci.lt.-s on >uj)[iii.-i- 

 titioiis evidence, and probably di-^tinot. Tlie.se appear to be fmin the 

 tropical fauna.] Analogue of the W. Indian T. iivciissnfits, (iiu 1. 



79 21. ?Thiil(U(xIes oryznta, ^liirch. Probably W. Central America, from tii9 

 adhesions; but "China: " Mus. Cum. 



• . . . Var. «. annulatu. Panama. Mus. Cum.* 



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

 trial and Fluviatile Molluscs, made by 0. Salvin. Esq., M.A.. in Guatemala; 

 oy the Ilev. 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 IG new species 

 show close gt leric affinities with the shells of the northern regions of S. 

 America. The shells ha^ icen identified from the Cumingian celiectioii. 

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



Page. No. PL Fig; 



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



2 . . . . Hiix eximia, Pfr. 



. . 3 . . . . Helix La/liana, Pfr., var. 



. . 4 . . . . Helix euniomphala, Pfr. Closely allied to the S. American 



H. Icixata. 



. . 5 . . . . Helix coactiliata, F<?r. 



, . G . . . . liuUmtm Pazianm, D'Orb. 



, . 7 . . . . Uulimus Morirandi. Pfr. 



, . 8 . . . . Ihiliniua Houdiiratiantis, Pfr. 



9 . . . . Ihi/i»)us Di/«)ni, Pfr. 



10 2G 8. IJ II limns semipeUucidtts, n. s. Allied to B. discrepans, Sby. 



, . 11 . . . . Succinea ?piUris, Ln. 



,. 12 .. .. Ghindina Ghieshreghti,Vh. 



, , 1.3 . . . . Glandiiia Carminensis, Morelet. Described from Costa Rica. 



. . 14 . . . . Ach(dina, sp. ind. 



., l.'j ., .. AcMtina ocfona,'iATa.. 



16 . . . . Snnixis lAittni, Pfr. 



17 .. .. Sinraxis Shi'lflewoiihii, Vft. 

 2-51 18 . . . . Sinraxis Cobanensis, n. s. 



10 . . . . Spiraxis, sp. ind. 



20 . . . . Leptinaria Emmclina, n. a. 



. . 21 . , . . Lejitinaria Elisa; n. s. 



. . 22 . . . . Ci/lindrella Ghieshreghti, Pfr 



. . 2.'{ . . . . Ci/lindrella S(dpinx, n. s. 



, . 24 . . . . Plii/sa Sotcerhyana , D'Orb. 



. . 2.') . . . . I'hysa purpiirostoma, n. s. Lake of Duenas. 



2(j . . . . Pliiiwrbis corpuhtdus, Say. 



2.]2 27 .. .. iY«;(o;-6M^«w»W(M, Pfr. 'rComp. P. <H;n«w, Maz. Cat. 2.38.] 



28 . . . . Planorbis Wyhli, n. sp. Lake of Duenas. 



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

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



.. 31 ., .. Seyrnentina Donbilli, n. a. Lake of Duenas. 



.. 32 .. .. Melampm fasciatiui, Chem. Salt-marshes on coast. 



, . 33 . . . . AdamsieUa Osberti, n. s. 



• The present posture of binomial nomenclature is well illustrated in this most rlabo* 

 rnte paper, which few naturalists have professed to understand. The shell of which th« 

 0])iM-culura-spine is figured in plate 25. f. 16, is quoted as " Siphonium (Sloa) tt(bcre' 

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

 {Thylacodus) contortus, var. y. contortula (Thyhi odus), forma 1, Thylocodu* (?) com 

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

 more easy to undert,*und and remember. Xbe Chduiiida of Middcjidorll' (v. i'irst llcport, 

 p. 214) are iimple in couiparisou* 



