61 



of more or less waved txansversely much elongated spots of brown; 

 on the last whorl arc two more series of shorter spots of the 

 same color ; with a varicoid rib a little behind the labrum ; with 

 rather coarse revolving strife anteriorly ; otherwise smooth and shin- 

 ing : apex acute : spire with the outlines slightly convex : whorls 

 eight or nine, moderately convex : aperture rather long, subelliptical, 

 acute above : labrum sharp : canal very short, and very wide. 



Mean divergence 38°; length of spire .29 inch; total length .57 

 inch ; breadth .24 inch. 



Pleurotoma AUGUSTS. Shell long ovate-fusiform : bright red, 

 whitish on the folds and anteriorly, with a wide or sometimes a linear 

 spiral band of brown, which is interrupted by the ribs : with nine 

 broad longitudinal ribs on each whorl : apex obtuse : spire with the 

 outlines nearly rectilinear : whorls six and one-half, a little convex, 

 with a lightly impressed suture : aperture obovate : sinus shallow : 

 canal very short, wide, and strong. 



Mean divergence 30° ; length of spire .48 inch ; total length .74 

 inch ; breadth .27 inch. 



Pleurotoma jatana. Shell clavate-pyramidal : black, with a 

 broad spiral pale yellowish nodiferous band, and another of the same 

 color anteriorly : with a series of broad close-set smooth not promi- 

 nent nodules on the lower half of the whorls of the spire ; ante- 

 riorly with four or five distant raised revolving lines, which are 

 sometimes granulous, the granules being white : apex acute : spire 

 with the outlines nearly rectilinear: whorls eight, planulate above the 

 series of nodules, with a lightly impressed suture ; last whorl subangu- 

 lar : aperture small : sinus a little below the extremity of the la- 

 brum : canal very short. 



Mean divergence 30°; length of spire .31 inch; total length 

 .5 inch ; breadth .24 inch. 



This species resembles P. zebra Kr., for which it was for some 

 time mistaken. 



Pleurotoma solida. Shell clavate pyramidal : very dark brown 

 or nearly black, with the intercostal spaces pale brown : with a very 

 slight keel on the upper part of the whorls, and a smooth space be- 

 low it, and somewhat oblique transverse ribs abruptly commencing 

 above the middle of the whorls, and spiral stride in the intercostal 

 spaces ; anteriorly with prominent raised revolving lines decussating 

 the transverse ribs : apex subacute : spire with the outlines nearly 

 rectilinear : whorls eight, a little convex, with a moderately impres- 



