1863.] REV. H. B. TRISTRAM ON GUATEMALAN MOLLUSKS. 413 



67. Helicina lirata, Pfr. 



Hub. Mountain-forests of Vera Paz. 



68. Melanoides glaphyra, Morelet. 

 Hab. Rio de la Pa9ion. 



69. Melanoides obeliscus, Reeve. 

 Hab. Lake Peten. 



70. Melanoides tumida, nov. spec. 



T. ohlongo-pyramidata, solida, ponderosa, nigricans, apice ple- 

 rumque sed non semper ej-oso ; anfract. 7-8, planulati, nltimus 

 ^ longitudinis testce eequans ; sutura inconspicua ; apertxira 

 C(Brulea, oblonga, margine coliimellari paullulujn effuso ; peri- 

 stotniutn infra productum. Operculum corneum, nigrescens, 

 hemicyclium. 



Long. 65, lat. 32 ; apert. long. 23, lat. 15 mill. 



Hab. Lake Peten, Vera Paz. 



This species may be distinguished from the following by its more 

 obtuse form and larger mouth, and by the greater size and convexity 

 of the last whorl. 



71. Melanoides godmanni, nov. spec. 



T. elongato-pyramidata, solida, nigricans velfusco-nigricans, apice 

 scepe eroso ; anfract. 8-9, planulati, crassiusculi, ultimus ^ lon- 

 gitudinis totius eequans; sutura minime profunda ; apertura 

 cceruleo- albescens, oblonga, infra rotundata, margine columel- 

 lari paullulum effuso. Operculum corneum, nigrescens, ob- 

 long o- ellip ticum . 



Long. 70, lat. 26 ; apert. long, 20, lat. 14 mill. 



Hab. Another part of Lake Peten, Vera Paz. 



72. Melanoides salvini, nov. spec. 



T. elongato-turrita, solidiuscula, nigrescens vet olivacea ; anfract. 

 10-11, convexiusculi, leviter accrescentes ; sutura satis pro- 

 funda ; anfractus ultimus lineis elevatis longitudinaliter subtus 

 striatus ; apertura ovato-oblonga, intus cornea ; peristomium 

 arcuatum et subtus productum. Operculum nigrum, oblongum. 



Long. 63, lat. 19 ; apert. long. 13, lat. 8 mill. 



Hab. Rio de la Pa9ion, Vera Paz. 



73. Pachycheilus l^vissimus. Sow. 

 Hab. Rio de la Pa9ion, Vera Paz. 



74. Pachycheilus gracilis, nov. spec. 



T. turrita, fusca vel olivacea, nitida, apice decoUato ; anfract. 

 5-6, superstites subconvexi, regulariter accrescentes ; sutura 

 mediocris ; apertura rotundata, effusa, brunnea ; perist. valde 

 productum, infra paullulum arcuatum. 



Long. tot. superstit. 26, lat. 10; apert. long. 9, lat. 7^ mill. 



Hab. Lake Peten, Vera Paz. 



