AURIS-EUDOLICHOTIS. 117 



with a groove or two defining the convexity. Suture narrowly mar- 

 gined. 



Aperture about half the length of shell or less, vertical, or with 

 the base carried forward. Peridome narrowly reflexed, thin, white ; 

 the outer lip arcuate or irregular, somewhat thickened within to- 

 ward the base, where there is a more or less developed notch or spout. 

 Columella bearing a strong or weak spirally ascending fold above, 

 brown, or with a white edge; the reflexed margin sinuous, usually 

 flaring forward. 



Alt. 40, diam. 18 ; alt. of aperture 21-22J mill. 



Alt. 37, diam. 16; alt. of aperture 16 mill. 



Car ip e (Jonas) ; Caracas (Moritz, Lansberg, Ernst, Cocking) ; 

 Venezuela. 



Sulimus euryomphalus JONAS, Zeitschr. f. Malak., 1844, p. 36 ; 

 Molluskolog. Beitr., p. 26, pi. 10, f. 15. PHIL., Ahbild., iii, p. 37, 

 pi. 8, f. 2. REEVE, Conch. Icon., pi. 54, f. 356. PFR., Monogr., ii, 

 p. 88; vi, p. 78. MARTENS, Binnenmoll. Venez. in Festschr. 100- 

 Jahrigeu Bestehens Ges. Naturf. Fr. Berlin, 1873, p. 176. Bulimus 

 otostomus PFR., P. Z. S., 1854, p. 291 ; Novit. Conch., i, p. 31, pi. 8, 

 f. 12, 13 ; Monogr., iv, p. 442. MARTENS, L c., p. 177. 



The variations seen in Caracas specimens are well shown by 

 the illustrations. Figs. 59, 60, 61 represent typical euryomphala, in 

 which the aperture is long and subvertical, guttered at base, and the 

 lip is gently arched toward the upper insertion. Figs. 56, 57 are 

 Pfeiffer's type of B. otostomus, in which the aperture inclines ob- 

 liquely forward toward the base, is short and trapezoidal, and the 

 outer lip is very strongly arcuate toward the upper insertion. In 

 fig. 55, these characters are more obvious. In fig. 58, is shown the 

 profile of a shell like otostomus in the angle of aperture, but like 

 euryomphala in its comparative size, intermediate between the two 

 in the curvature of the lip. Other examples before me unite the 

 several differential features of the two forms in such various styles 

 of combination that I do not see how any specific or varietal status 

 can be sustained for B. otostomus. 



In a few of the larger specimens there is some trace of the long- 

 grained sculpture of A.sinuata; but the constantly smaller size, 

 smoothness, zig-zag pattern and less developed calluses of the mouth 

 are sufficient specific distinctions. There is sometimes a. strong 

 groove at root of columella, and the earlier whorls are faint orange 

 in some shells. 



