EUC ALODIUM. 1 



Genus EUCALODIUM Crosse & Fischer, 1868. 



Urocoptis, section a, conico-turritas, ALBERS, Die Heliceen 

 edit. 2, p. 36 (I860). Eucalodium CROSSE & FISCHER, Journ. 

 de Conch, xvi, 1868, p. 88; Miss. Scientif. Mex., Moll. i. pp. 

 353-362. STREBEL & PFEFFER, Beitrag Mex. Land-und Siiss- 

 wasser-Conchylien, iv, p. 62. von MARTENS, Biologia Cen- 

 trali- Americana, Moll., p. 254. 



Shell cylindric or cylindric-tapering, the upper whorls al- 

 ways lost in adults, the hole closed by a somewhat convex 

 partition, 7 to 14 whorls usually remaining ; imperf orate, the 

 axis either straight or one-plaited, and solid or perforated by 

 a mere chink. ' * Size comparatively large, between 84 and 32 

 mm. in length and 21 and 10 mm. in diameter." Surface cov- 

 ered with a thin cuticle, rib-striate or costulate. The last 

 whorl becomes very shortly free in front. Aperture ovate, 

 more or less angular above, the peristome free, thickened and 

 narrowly reflexed. 



The foot is rather short, the peduncle uniting it to the vis- 

 ceral mass comparatively long. There are two accessory neck- 

 lobes. The kidney slightly exceeds the pericardium in length, 

 and is wide at the base; the secondary ureter is apparently 

 closed (pi. 49, fig. 17, E. Uandianum, x 2; after Strebel). 



The genital system (pi. 49, fig. 10, E. ghiesbregkti after 

 Fischer; fig. 11, 12, 14, E. Uandianum after Strebel) is sim- 

 ple. The penis is rather swollen, with longitudinally plicate 

 internal wall (fig. 14) and a perforate septum at the apex, 

 where the retractor and epiphallus are inserted. The long 

 epiphallus is internally plicate below, but above the walls bear 

 pyramidal warts (fig. 12). The retractor muscle of the penis 

 is inserted in the lung floor. There is a moderately long 

 vagina, and the globose spermatheca has a duct about as long 

 as the uterus. 



The free retractor muscles (pi. 49, fig. 16, E. Uandianum 

 after Strebel, diagrammatic,) are inserted high in the shell. 

 The columellar muscle has the usual distal insertion in the 

 posterior integument of the mantle, and gives off the other 

 bands in the following order: 1, the pharyngeal retractor; 

 2, the retractor of the left side ; 3, the right retractor. Each 



