194 Nelson on Tertiary Mollusca of Peru. 



Pleurotoma, sp. ind. 



I refer to this genus three specimens too imperfectly preserved for 

 specific determination or measurement. They agree in form and 

 details with this genus, but further sjjecimens will be necessary to 

 settle the question accurately. 



Conns, sp. ind., A. 



Three species of Conus occur in this collection. The first resem- 

 bles C. mahogani Rve,, and might at first sight be confounded with 

 that species. But the two may easily be distinguished by the whorls 

 of the spire. In C mahogani the spire is regularly conical, and the 

 whorls have all an equal slope, while in this species the whorls are slight- 

 ly turreted. The transverse lines of the body whorl are also slightly 

 narrower and extend further up the side of the whorl. This species 

 is a very abundant one, both as casts and well preserved specimens. 

 Length 20 millim. ; length of spire 5-05 millim. ; breadth 8"95 millim. 

 A larger specimen measures: length 36'2 millim.; breadth 16'2 

 millim. 



Conus, sp. ind., B. 



Our second species more closely resembles Conus purpurascens 

 Brod., but has the spire more elevated than the average of that 

 species ; whorls more depressed above, and the transverse strite less 

 distinct or wholly wanting. Body whorl not examined. Length 7 3 "4 

 millim. ; breadth 39*2 millim. 



Conns, sp. ind., C. 



This species, represented by four specimens, is remarkable for the 

 very short spire. The shell is nearly flat above, except the last three 

 or four whorls, which at the summit rise into an acuminate spire. 

 Sutures very distinct. Our largest specimen gives the following 

 measurements : length V5 millim. ; length of spire 6 millim. ; breadth 

 47 "8 millim. 



Solarium sexlineare, sp. nov. 



Plate VI, figure 11. 

 Shell circular, depressed ; whorls seven to eight, modei-ately convex, 

 separated by distinctly marked sutures, ornamented by broad, sub- 

 equal revolving lines. Body whorl large, two-thirds the heighth of 

 the shell, marked with four revolving lines, of which that next the 

 suture is the broadest, the remaining ones nearly equal in size. The 

 line which forms the edge of the whorl is double the width of the 



