'tilt 



BULIMULUS-PROTOGLYPTUS. 85 



b"' '. Similar to (b"), but unicolored, sutures shallow, 

 last whorl wider, v. lucice, p. 86. 



Faint growth lines and cuticular spirals; very 

 thin and fragile ; apex densely striolate vertically ; 

 whorls 4f , alt. 10*, diam. 6'6 mill. ; aperture 

 over half the length, eudioptus, p. 89. 



a'. Whorls 7 2-9 ; form slender, long, the alt. more than 

 twice the diam. ; often streaked. 



b. Hairy; openly perforate, with 8 slightly convex 

 whorls; alt. 20, diam. 9; aperture 8? mill., 



trichodes, p. 92. 

 b'. Not hairy. 



c. Umbilicus large ; 8 slightly convex whorls ; 

 alt. 19, diam. 8 mill., rivasii, p. 91. 



c'. Umbilicus narrow ; whorls very convex, 



montivagus, p. 90 ; crepundia, p. 90. 

 II. Shell solid, more calcareous. 



a. None of the riblets of early whorls beaded. 



b. Form compact, whorls 7, aperture about alt. ; 



alt. 19-24 mill. : durus, p. 87 ; ovuhim, p. 88. 



b r . Outer lip unexpanded ; aperture over half the alt. ; 



alt. 32 mill., pachys, p. 88. 



a'. Second nepionic whorl with the riblets beaded ; solid and 



calcareous species, glyptocephalus, p. 93 ; sarcochroa, 93. 



B. PILOSUS (Guppy). PI. 13, figs. 8, 9, 20. 



Shell small, umbilicate, oblong-conic, thin ; corneous-brown. 

 Surface but little shining, with oblique growth-lines and very 

 numerous spiral lines of short, delicate, velvety hairs, or the slight 

 scars remaining when they are rubbed off. Spire conic, the apex 

 very obtuse, earlier 1? whorls delicately vertically costulate (fig. 20), 

 whorls fully 6, very convex, and separated by deep sutures. 



Aperture oblique, decidedly over one-third the total length ; 

 peristome thin, the basal margin somewhat expanded, columellar 

 margin broadly dilated. 



Alt. 13?, diam. 7 ; alt. of aperture 5? mill. 



Trinidad (Guppy). 



Buliminus pilosus GUPPY, Amer. Journ. Conch., vi, p. 310, pi. 

 17, f. 12 (1871). Bulimus pilosus GUPPY, P. Z. S., 1875, p. 323 ; 



