1861.] REV. H. B. TRISTRAM ON GUATEMALAN MOLLUSKS. 231 



18. Spiraxis cobanensis, nov. spec. 



T. elongato-oblonga, tenuis, nitida, vitrea, pellucida; spira brevis, 

 conica, obtusa; sutura Icevis ; an/ract. 5,])lciniusculi, tdtimtis antice 

 descendens -^ longihidinis formans, bast rotundatus ; lamina colu- 

 mellaris fuiiiculata, ihtorta ; apertura verticalis, inverse piri- 

 formis ; peristoma simp^ea;, margine dextro medio valde dilatato 

 et compresso. 



Loug. 18, diam. 5 mill. 



19. Spiraxis (spec. dub.). 



20. Leptinaria emmelin^, nov. spec. 



T. elongata, tenuivscula, opaca, nitida, vix striatiila ; spira conica, 

 acuminatiuscula ; aiifract. 7-S, convexi, ultimus spirce vix aqualis, 

 sublavigatus ; columella intorta, inlus lucide albida ; peristoma 

 vix expansum, margine dex'tro compresso ; apertura dente acuta 

 superne miinita. 



Lung. 15, diam. 5 mill. 



21. Leptinaria elis^e, nov. spec. 



T. conico-ovata, tenuiuscula, semipellucida, nitida, delicatissime 

 striata; spira obtusa, conica; sutura profunda ; aifr. 5-6, con- 

 vexi, ultimus spiram dimidio superans, sublavigatus ; columella 

 intorta, intus margaritaceo-idbida ; peristoma expansum, margine 

 dcxtro sulcato compresso ; apertura in margine interno acute uni- 

 dentata. 



Long. 10"5, diam. 6 mill. 



22. Cylindrella ghiesbreghti, Pfr. 



23. Cylindrella salpinx, nov. spec. 



T. rimata, cylindraceo-turrita, sordide albida ; spira medio ventro- 

 sior, apice subtruncata, Tprofunde oblique striata ; sutura profunda; 

 anfract. superst. 15, convexi, penultimus semiplicatus, ultimus 

 antice ascendens, basi distincte carinatus, et longe protractus ; 

 apertura verticalis, oblique ovalis ; perist. continuum, undique 

 large expansum. 



Long. 11, diam. 2 mill. 



24. Physa sowerbyana, D'Orb. 



25. Physa purpurostoma, nov. spec. 



T. elliptico-ovata, fusco-cornea, nitidissima, diaphana ; spira conica, 

 brevis, apice acuta ; anfract. 4-5, vix convexi, ultimus 4 longi- 

 tudinis for mans ; sutura minime depressa ; apertura conico-ovalis, 

 margine externo expanso ; columella in adult, purpurascens, in 

 juv. rosea, albo-marginata. 



Long. 22, diam. 11 mill. 



Hab. Lake of Dueuas. 



26. Planorbis corpulentus. Say. 



