Nelson on Tertiary Mollusca of Peru. 187 



This beautiful species, although quite distiuct, closely resembles 

 both Callopoma saxosnm Wood and Callojyoma fluctuosum Mawe. 



From C. saxosum it may be distinguished by having the whorls 

 less flattened above ; lacking the row of tubercles at top of the body 

 whorl; and in having much finer and smoother longitudinal lines. 

 From C fluctuosum it may be distinguished by lacking the strong 

 rows of tubercles near the base of the body whorl ; by having fewer 

 revolving lines, and stronger and more distinct longitudinal ones. 



Callopoma, sp. ind. 



I refer to this genus a very large cast found with the preceding 

 species. It gives the following approximate measurements : length 

 105 millim.; breadth 95 millim. 



Calliostoma nodnliferum, sp. nov. 



Plate VI, figure 1. 



Shell conical and elevated ; whorls six, moderately convex ; sutures 

 very distinct. Surface of spire marked by a few nodulous or beaded 

 lines, six to eight on each whorl, well elevated and about half the 

 width of the spaces between them. Body whorl convex above, keeled 

 below, marked by the beaded lines and intermingled finer nodulous 

 ridges. Apertu.re subquadrangular ; outer lip sharp; columellar lip 

 covered thickly by callus. 



Length (4 whorls) 8*8 millim.; breadth 10-9 millim. 



The marking of the body whorl is very peculiar and characteristic. 

 The strong elevated lines bear on their summits a row of nodules 

 resembling beads, while alternating with these lines there are finer 

 ridges, also nodulous. This species is less elevated, has more distinct 

 sutures and fewer striae than Calliostoma lima Phil., the nearest 

 related species. 



Uvanilla, sp. ind. 



I refer very doubtfully to this genus a specimen too poor for identi- 

 fication. It is mostly in the state of a cast and bears resemblance 

 to this genus. External characters mostly wanting. 



Breadth 77*2 millim. 



Crepidnla, sp. ind. 



Genus represented by six casts. The generic relation was proven 

 by breaking open one of the casts, when the transverse partition 

 became apparent. 



