390 CYLliNDRELLA §. 13. 



217. (122.) goniostoma Pfr. — Chemn. p. 63. — Holospira A^. 40. 



— Respubl. mexicana. (IV, 710.) 



218. C microstoma Pfr. 



T. subperforata , cylindracea , laevigata , cretacea ; spira 

 sursum dilatata, in conum brevem acutiusculum desinens; su- 

 tura impressa; anfr. 18 subplani, aequales, summi plicatuli, 

 ullimus striatus, antice solutus, dorso carinatus, basi angulatus, 

 angulo anlrorsum evanescente ; apertura parvula , verticalis, 

 subtriangularis; perist. undique breviter expansum. — Long. 

 ISy^, diam. 5 miU. Ap. oblique 2% mill. longa. (Mus. Guming.) 

 CyUndrella microstoma Pfr. in Proc. Zool. Soc. 1861. p. 27. 

 (Malak. Bl. Vm. 1861. p. 81.) 

 Habitat . . .? 



219. C. Tryoni Pfr. 



T. perforato - riraata, subcylindrica, solida^ vix nitidula, 

 subtiliter et conferte striatula, alba; spira supra medium sub- 

 incrassata, cono obtusulo brevi, pallide lutescente terminata; 

 anfr. 15 angusti, vix convexiusculi, ullimus distinctius striatus, 

 antice paululum ascendens, breviter solutus, antrorsum pro- 

 Iractus, rotundatus, basi obsolete angulatus; apertura verticalis, 

 parvula, subcircularis; perist. continuum, undique brevissime 

 expansum. — Long. ISy^, diam. max. 4^^ mill. Apert. SV^ 

 mill. ionga, vix minus lata. (Coll. Nr. 165.) 



CylindreUa Tryoni Pfr. in Journ. Conch. XV. 1867. p. 438. 

 Habitat prope Puebla reipublicae mexicanae. 



Obs. Differt ab affini C. Pilocerei Pfr. testa laeviore, anfractibus an- 

 gustioribus, apertura parvula, fere circulari, superne non angulala. 



220. C. imbricata Martens. 



«Testa imperforata _, obovata, superne ventrosa, dein in 

 conum brevem desinens, solidula, costulata, griseo-albida; apex 

 integer, prominulus; anfractus 16, plani^ primordiales 2 laeves, 

 sequentes 7 sat celeriter crescentes, costis validis obliquis 

 sculpti, sequentes 4 paulatim decrescentes, quovis praecedente 

 imbricatim super-prominente, penultimus et ultimus arcuatim 

 costati, ultimi pars antica soluta, porrecta, intorta, basi haud 

 angulata; apertura verticalis, oblique piriformis, peristoma? — 

 Long. 16, diam. in anfractu decimo 8, penultimo sy^; apert. 

 altit. 4, iatit. 3 mill. » (v. M.) 



