108 AURI8-EUDOLICHOTIS. 



14, 15 ; Monogr., ii, p. 90 ; iii, 376 ; iv, 445 ; vi, 80. REEVE, Conch. 

 Icon., pi. 33, f. 200. Otostomus signatus BECK, Index, p. 55. 



A peculiarly isolated species, having somewhat the hunch-backed 

 shape of some Auriculas. Its nearest allies are the forms included 

 in the following subgenus. The apical whorls, when unworn, show 

 an excessively minute and superficial grated sculpture, as in 

 Drymceus. The anatomy is unknown. 



The form having longitudinal bands was called vittata by Spix, 

 but it seems to be merely an extreme pattern formed by the interrup- 

 tion of the irregular spiral bands of ordinary specimens. 



Subgenus EUDOLICHOTIS Pilsbry, 1896. 



Pelecychilus Guilding, ALBERS- MARTENS in Die Heliceen, 1860, 

 p. 188 (exclusive of last species). Not Plekocheilus Guilding. 



Shell fusiform or long-ovate, umbilicate ; striped or variegated 

 with brown on a light ground. Whorls 42-5i, slightly convex, the 

 last either pinched at base and behind the lip or rounded. Aperture 

 about half the length of the shell, ear shaped, the outer lip reflexed, 

 sinuous, usually thickened within ; columella with an oblique fold, 

 often very strong. Surface striate or diamond-granulate, never with 

 spirally arranged granules, some whorls of spire rib-striate. Type 

 A. distorta Brug. 



Distribution, Venezuela, Trinidad and some adjacent islands ; 

 Para, Brazil. Living on trees. 



The shells of this group have much in common with the Auris 

 species, A. (Eudolichotis) sinuata having the basal notch as in Auris 

 melastoma, and A. (Eudolichotis^ midas recalling Auris illheocola. 

 Eudolichotis is also allied to Gonyostomus, but differs markedly in 

 the style of sculpture and the sinuous or calloused peristome. 



The species are all excessively mutable, the range of individual 

 variation almost connecting some species which are typically very 

 unlike. In many cases strong variations occur indiscriminately 

 among individuals from one locality, and are not correlated 

 with geographic range ; thus the specimens of A. sinuata or A. 

 euryomphalus which I have figured are all from the same place. In 

 A. distorta and A. glabra an attempt has been made to diagnose 

 racial forms ; but series of specimens with geographic data which 

 would ordinarily be held sufficient for satisfactory specific work, are 

 in Eudolichotis comparatively inconclusive. The results recorded be- 



