448 CYLINDRELLA 8. 14. 45. 
236. microstoma Pfr. VI. 390. —  Holospira microstoma Crosse & 
Fisch. in Journ. Conch. XVIII. p. 24; Moll. terr. Mex. p. 337. 
t. 17. f. 9. — Habitat? 
* * * 
237. imbricata Martens. VI. 390. —  Holospira imbricata Crosse 
& Fisch. in Journ. Conch. XVIII. p. 24; Moll. terr. Mex. p. 336. — 
Respubl. mexicana. 
* * 
* 
238. salpinx 'Tristram. jJ. VI. 391. — Crosse S Fisch. Moll. terr. 
Mex. p. 415 (species dubia). — Guatemala. 
S. 15. 
239. Lüdersi Pfr. IV. 712. VI. 391. — Habitat? 
240. C. irregularis Gabb. 
* T. ad apicem fere umbilicata, cylindraceo- turrita, apice 
non truncata, obtusiuscula, conferte et arcuatim costata, pallide 
cornea; spira elongata, irregularis, anfractibus 3 primis aequa- 
libus; sutura simplex; anfr. 416—418 convexi, ultimus minus con- 
vexus, antice breviter solutus, non descendens, dorso et basi 
subacute carinatus; apertura vix obliqua, rhombea, latere si- 
nistro substricto, basi canaliculato; perist. continuum, margini- 
bus subparallelis, supero recto, obliquo, columellari late expanso, 
dextro et infero expansiuseulis; umbilicus angustus, aequalis, 
extus angulo cinctus. — Long. 20, diam. 5 mill. (Coll. Nr. 175.) 
Cylindrella | irregularis (Urocoptis) Gabb *) in Amer. journ. 
conch. IH, 1876. p..238,:6,/16. E 4. 
conum breviusculum terminata; sutura impressa; anfractus 45 —416 sub- 
plani, primi 1!/ laevigati, cornei, sequentes 9 — 10 conferte et oblique 
costulati, sequentes 4 costulis magis distantibus, paulo majoribus et sub- 
arcuatis impressi, ultimus breviter solutus, antice procedens, dorso et basi 
obsolete angulatus, pallidior; apertura verticalis, oblique angulato - ovalis, 
intus albida; peristoma undique liberum, breviter expansum, vix reflexius— 
culum, album. — Columna interna ...? — Longit. vix 45, diam. maj. 
3 mill  Apert. cum perist. oblique 2!/, mill. longa, 2 lata.» 
*) «Shell about an inch long, slender, spire irregularly tapering, the 
first three whorls being of the same diameter, the next five to seven 
whorls increasing steadily, after which the remainder are nearly of the 
same diameter; apex not always exactly in the axe of the shell; whorls 
sixteen to eighteen, rounded on íhe side, body whorl slightly subangulated 
below; suture: impressed; umbilicus minutely perforate, and. bordered by 
a slight angle; aperture irregular in outline, angulated internally, above 
and below; outer lip but slightly expanded; inner lip curved internally, 
and expanded so as to hide the umbilical region in part, most expanded 
in the middle, and in some specimens distinctly subangulated at this point. 
Surface sculptured by small lengiitinal slightly arched ribs; color light 
horn brown.» (G.) 
