PLEUROTOMA. 



Plate XL 



Species 90. (Mus. Cuming.) 



Pleurotoma granulosa. Pleur. testd turrito-pyrami- 

 dali ; anfractibus prope suturam Icevibus, tumidiuscu- 

 lis, in medio rotundato-costatis, costis lineato-decus- 

 satis, lineis decussantibus, minutissime granulosis; 

 aperturd brevi; canali brevi, lato ; sinu rotundato. 



The granulous Pleurotoma. Shell turrited, pyra- 

 midal, light brown ; whorls smooth and rather 

 swollen near the suture, rotundately ribbed in the 

 middle, ribs crossed with very finely granulated 

 lines ; aperture short, broad ; sinus rounded. 



Sowerby, Pro. Zool. Soc, 1833. 



Hab. Bays of Montija and Panama (found in sand at the 

 depth of eight fathoms) ; Cuming. 



The granules which characterize this shell are scarcely 

 perceptible to the naked eye. 



Species 91. (Mus. Cuming.) 



Pleurotoma rustica. Pleur. testd rudi, crassiusculd , 

 oblongo-pyramidali, fusco-nigricante ; anfractibus 

 prope suturam unicarinatis, infra longitudinaliter 

 costatis, costis numerosis, acutis, ultimi costis lineato- 

 decussutis, decurrentibus ; aperturd brevi ; canali 

 brevissimo, sinu rotundato. 



The rustic Pleurotoma. Shell rude, rather thick, 

 oblong, pyramidal, brownish black ; whorls keeled 

 near the suture, longitudinally ribbed below, ribs 

 numerous, sharp ; ribs of the last whorl flowing 

 down, crossed with lines ; aperture short ; canal 

 very short; sinus rounded. 



Sowerby, Pro. Zocl. Soc, 1843. 



Hah. Xipixapi, West Columbia (found under stones) ; 

 Cuming. 



This shell is of a more solid cylindrical form than the 

 P. nigerrima, to which it is nearly allied, and the aper- 

 ture is much the shorter. 



Species 9'2. (Mus. Cuming.) 



Pleurotoma unicolor. Pleur. trstii crassiusculd, ob- 

 longd, pyramidali, pallide fusco-nigricante ; anfrac- 

 tibus Itevibus, prope suturam serie unicd granularum 

 ornatd, infra longitudinaliter costatis; aperturd brevi; 

 canali brevissimo ; sinu rotundato. 



The uniformly-coloured Pleurotoma. Shell rather 

 thick, oblong, pyramidal, pale brownish black ; 

 whorls smooth, encircled with a single row of gra- 

 nules near the suture, longitudinally ribbed below ; 

 aperture short ; canal very short ; sinus rounded. 



Sowerby, Pro. Zool. Soc, 1S43. 



Hab. Panama (dredged from a sandy muddy floor at the 

 depth of about eight fathoms) ; Cuming. 



A very dark horny-looking shell. 



Species 93. (Mus. Harford.) 



Pleurotoma Harfordiana. Pleur. testd obeso-pyra- 

 midali; anfractibus nigerrimis, in medio luteo-baltea- 

 tis, convexis, transversim subtilissime striatis, superne 

 depressiusculis, serie unicd nodulorum ornatd, infra 

 noduloso-costatis ; aperturd breviusculd ; sinu parvo, 

 rotundato. 



Harford's Pleurotoma. Shell stoutly pyramidal ; 

 whorls very black, girt round the middle with a 

 narrow yellow belt, convex, transversely very finely 

 striated; upper part of the whorls rather depressed, 

 encircled with a row of small nodules, below nodu- 

 lously ribbed ; aperture rather short ; sinus small, 

 rounded. 



Reeve, Pro. Zool. Soc, 1843. 



Hab. ? 



I have much pleasure in dedicating this species to its 

 possessor, an intelligent conchologist, and one highly 

 worthy of remembrance. The yellow belt which passes 

 round the middle of each whorl has a strikingly neat 

 appearance. 



Species 94. (Mus. Stainforth.) 



Pleurotoma Perronii. Pleur. testa fusiform i, lurrila. 

 liiriusculd, pallide luted ; anfractibus plain's, superrii 

 Icriter angulatis, ultimo infern'e coarctato, transver- 

 sim lirato, liris regularibus, subdistantibus ; sinu sub- 

 centrali; canali subetougato, recto. 



Perron's Pleurotoma. Shell fusiform, turrited, rather 

 smooth, pale yellow ; whorls flat, slightly angu- 

 lated round the upper part, lower portion of tin- 

 last whorl contracted and transversely ridged, 

 ridges regular, and somewhat distant from each 



May 1843. 



