62 



sed suture, whicb is crenulated by the entrauce of the ribs from 

 above : aperture rather small : labrum produced along the middle 

 and in dead shells usually broken off : sinus deep, a little below the 

 extremity of the labrum : canal very short. This species is allied to 

 P. unicolor Sowh., P- rustica Sowh., and P. fuscescens Gray. 



Mean divergencce 27° ; length of spire .45 inch ; total length .08 

 inch ; breadth ,28 inch. 



Pleurotoma fuscocincta. Shell clavate pyramidal : pale yel- 

 lowish white, with a sutural line of brown, anteriorly wax yellow with 

 revolving lines of yellowish white : with a spiral series of large 

 smooth well rounded nodules, on slightly elevated wide ridges on the 

 lower half of the whorls ; anteriorly with a few spiral raised lines : 

 apex acute : spire with the outlines rectilinear : whorls seven or eight, 

 not convex, with the suture not impressed : aperture rather wide : 

 canal very short. 



Mean divergence 33°; length of spire .17 inch; total length .27 

 inch; breadth .13 inch. 



Pleurotoma mactjlata. Shell ovate-fusiform : white with a 

 spiral series of large distant yellowish brown spots on the upper part 

 of the whorls ; anteriorly with a spiral band of very pale yellowish 

 brown terminating often in a deeper spot on the labrum : with eleven 

 or twelve transverse ridges on each whorl, which are decussated by 

 several spiral prominent lines : apex acute : spire with the outlines 

 moderately convex : whorls seven, angular, with a well impressed su- 

 ture : aperture small, nearly in the form of a <:j : labrum well ex- 

 curved, denticulate within: sinus not very small, near the upper ex- 

 tremity of the labrum : canal short, turning to the left. 



Mean divergence 31° ; length of spire .1 inch; total length .17 

 inch ; breadth .08 inch. 



This species has some resemblance to P. quadrata Rv. 

 Pleurotoma quadrata (?) Rv. The figure of this species in Reeve's 

 Conch. Icon, represents quite accurately a species, which inhabits Ja- 

 maica, but the figure is three times the linear dimensions of our shell, 

 although it is not said to be magnified. If our specimens belong to 

 a distinct species, it may receive the name of P. diminuta. 



Pleurotoma decokata. Shell ovate-fusiform : covered, on a 

 whitish ground, with a net work of bright brown irregular spots and 

 lines, which on the upper whorls are less numerous, somewhat regu- 

 lar and darker : with, on the upper whorls, strong transverse ridges 

 which become smaller and at length disappear on the penult whorl ; 



