JVelsoti on Tertiary Mollusca of Peru. 199 



distinct. Surface of upper whorls, marked by a row of strong tuber- 

 cles, eight to ten on each whorl. Body whorl large, ventricose, and 

 triangular in shape, half the whole length of the shell ; arched in 

 front and quite depressed above ; marked by one strong tubercle on 

 the back just below the suture; by a strong transverse oblique ridge 

 on the left of the aperture ; by a more or less distinct ridge along the 

 outer lip ; and by a low ridge connecting with the large tubercle. 

 Base of the whorl marked by a few concentric lines. Aperture long, 

 narrow, and slightly winding. Columellar lip covered by a thin 

 callus. Outer lip thickened within and marked by a few strong teeth. 

 Canal open and nearly straight. The following are the measurements 

 of this species: length 27 millim. ; breadth 11*4 millim. 



I have been unable to find any diiferences between the specimens 

 of Stromhina in this collection and sj^ecimens of S. lanceolata in the 

 Museum of Yale College, and I therefore, without hesitation, pro- 

 nounce them the same. This is a very interesting circumstance, for 

 the majority of the species, though closely allied, are very clearly 

 distinct from the species now living on the west coast. 



Clavella solida, sp. uov. 



Shell oval, ventricose, and heavy; spire moderately elevated and 

 tapering. Whorls five to seven, more or less depressed above. 

 Sutures distinct. Body whorl large, more than two-thirds the length 

 of the shell, regularly convex, depressed above the shoulder, which 

 is large and strong, and forms a very distinct ridge, extending more 

 than half around the shell. 



The upper whorls are marked by a series of longitudinal ridges, 

 eight or ten to a whorl, and crossed by strong, equidistant, revolving 

 lines. The two lower whorls are destitute of the ridges, but orna- 

 mented by revolving lines, which become more or less indistinct on 

 the body whorl in mature specimens. The base of the body whorl is 

 marked by much stronger lines. Variable in size. .Vperture oblong- 

 oval ; outer lip thin. Canal long and slightly reflexed. Umbilical 

 chink bordered by a broad keel. Measurements as follows : length 43*2 

 millim. ; breadth (at shoulder) 30-6 millim. ; breadth (below shoulder) 

 28 millim. 



This species bears strong analogy to C. distorta Wood, but is a 

 stronger shell, has a shorter sjiire, and finer and more numerous revolv- 

 ing lines on the upper whorls. 



The shoulder is convex above in C. distorta, but depressed in C. 

 solida. 



