UROCOPTIS, S. G. GONGYLOSTOMA. 197 



is intermediate between U. shuttleworthiana and U. hum- 

 boldtiana. U. shuttleworthiana has 30 to 40 riblets on the 

 penult, whorl, peraffinis has nearly 70, and humboldtiana 140. 

 The first is lustreless, peraffinis nearly so, and humboldtiana 

 is rather glossy. Aside from these external features, the 

 present species has great similarity to U. vignalcnsis, having 

 about the same internal structure; but the interior is not 

 darkened as in vignalensis and its allies, species which I now 

 place in a different phylum, believing the similar axial struc- 

 ture to be homoplastic rather than in the strict sense homo- 

 logous. 



66. U. OVIEDOIANA (Orbigny). PI. 47, figs. 87, 88. 



Shell much lengthened, cylindric, thin, brown ; marked lon- 

 gitudinally and a little obliquely with equal plicae, stronger 

 in front. Spire very long, cylindric, noticeably tapering and 

 truncate in adults, no doubt acuminate and acute in the 

 young; composed of 12 narrow, flat whorls, the last a little 

 detached near the mouth, and cariuate below. Aperture pro- 

 duced quite laterally, oval, oblique, the peristome thin and 

 sharp, much dilated and continuous. Length 28, diam. 5 

 mm. (Orb.). 



Cuba: In the interior (de la Sagra). 



Pupa oviedoiana ORB., Hist. Cuba, Moll., i, p. 182, pi. 12, 

 f. 15, 16. C. oviedoiana Orb., PFR., Monogr., ii, p. 380. 



If Orbigny 's figures copied on my plate are reasonably 

 accurate, the shell usually known as oviedoiana is pretty cer- 

 tainly not correctly identified. It differs from these figures 

 in being stouter, with notably shorter neck and much closer 

 striation. Moreover, the apex is more obtuse; though from 

 the wording of Orbigny 's description, it is not certain that 

 he had any specimen with the spire entire, even though he so 

 figures it. 



Section Paracallonia Pilsbry, 1902. 



Urocoptis with three axial lamellcc subcqual in the median 

 whorls, the lower lamella denticulate, at least in the upper 

 whorls. Basal keel of the last whorl weak. Type U. albo- 



