A EUCALODIUM. 



tentacular band gives off a branch anteriorly, uniting in a 

 plate over the buccal mass; from this plate the ocular retrac- 

 tors arise (pi. 49, fig. 13). 



The jaw (pi. 50, fig. 1, E. Uandianum, after Strebel) is of 

 the usual arcuate shape, always has a slight median projection 

 below, and is made up of many narrow vertical plates. 



The radula in E. ghiesbreghti is wide, with the formula 

 65,1,65 x 110; the transverse rows being nearly straight. In 

 all the other species examined it is narrower, with compara- 

 tively few teeth: 36,1,36 x 130 in E. Uandianum (Fischer), 

 34,1,34 x 130 (Strebel for the same species) ; 24,1,24 in mexi- 

 tanum; 31,1,31 in E. edwardsianum, 26,1,26 in E. martensi 

 (Strebel). The teeth are similar in all, being of the type 

 common to most ground-living Helicida. The rhachidian 

 tooth is tricuspid, the mesocone conic, a little over-reaching 

 the posterior border of the basal-plate. The lateral teeth are 

 similar except for the suppression of the entocones. Margin- 

 als also biscupid, the ectocone sometimes split (pi. 50, fig. 2, 3, 

 E. blandianum, after Fischer). 



The intestinal tract (pi. 49, fig. 15. E. ghiesbreghti after 

 Fischer) should be refigured with the parts in their natural 

 positions, in order to compare with other genera. The sali- 

 vary glands are large and united. The fore-gut is very long, 

 as in other genera of this family. The stomach is thin- 

 walled. 



" Geographically limited to the southern half of Mexico 

 and the northern half of Guatemala." They live on the 

 ground under dead leaves, chiefly in moist woods, and in dry 

 seasons bury themselves in the earth. 



The most striking single character of Eucalodium is per- 

 haps the union of the ocular retractor muscles in a plate lying 

 over the gullet. The rest of the soft anatomy, so far as 

 known, does not differ remarkably from that of allied genera, 



Subgenera. 



EUCALODIUM s. str. : Axis carrying a strong, compressed, 

 spiral lamella, median in each whorL 



OLIGOSTYLUS: Axis simple and straight, or slightly curved 

 spirally. 



