PLEUROTOMA.— Plate V. 



round the upper part with a series of closely- folded 



scales, like tubercles ; canal very short, recurved ; 



aperture oblong, interior highly enamelled, stained 



above and below with deep purple, 

 Lamarck, Anim. sans vert., vol. vii. p. 91. 

 Kiener, Icon., pi. 20. f. 1. 



Clavatula imperialis, Enc. Meth., pi. 440. f. I. a, b. 

 Hab. Cabenda, West Coast of Africa. (Found at five 



fathoms depth in soft mud, washed down by the 



waters of the Congo.) 



I am much indebted to Lieut. Hankey, R.N., for the 

 loan of this rare and highly interesting shell, obtained 

 by him at the above-mentioned locality with the animal 

 in it. Another specimen before me, belonging to Mr. 

 Cuming, was brought by Lieut. Shaw from the Gambia. 



Species 34. (Mus. Stainforth.) 



Pleurotoma bimarginata. Pleur. testd fusiformi-tur- 

 ritd, solidiusculd, tuherculiferd, fulvo-rubente ; an- 

 fractibus medio concavis, superne inferneque margi- 

 natis, suturis inter prqfundis ; canali brevi, sub- 

 ftexuoso. 



The double-edged Pleurotoma. Shell fusiformly tur- 

 rited, rather solid, tuberculous, yellowish red; 

 whorls concave in the middle, distinctly margined 

 above and below, leaving a deep, narrow suture 

 between them ; canal short, a little twisted. 



Lamarck, Anim. sans vert., vol. vii. p. 93. 



Kiener, Icon., pi. 2. f. 2. 



Hab. ? 



The double-edge peculiarity of this shell is remarkable, 

 and I am not acquainted with any other of this genus 

 which exhibits the same reddish cast of colour. 



Species 35. (Mus. Stainforth.) 



Pleurotoma annulata. Pleur. testd solidd, subulatd, 

 brunned, anfractibus leviter eonvexis, liris hevibus, 

 pallidioribus, numerosis, annulatim cinctis ; canali 

 subelongato. 



The ringed Pleurotoma. Shell solid, subulate, brown ; 

 whorls slightly convex, encircled with a number of 

 smooth, paler ridges, like rings ; canal rather long. 



Hab. 



This shell reminded me at first sight of the PL Dcs- 

 hayesii (PL elongata, Gray, Zoology of Beechey's Voyage, 

 p. 119.) ; it may, however, be readily distinguished from 

 that species by the number of well-marked, ring-like 

 ridges by which the entire surface is encircled. 



Species 36. (Mus. Stainforth.) 



Pleurotoma catena. Pleur. testd elongato-fusiformi, 

 turritd, acuminatd, flavido-grised ; anfractibus medio 

 valde eonvexis, quasi subitb tumidis, tuberculis exi. 

 miis, albis, obliquis, seriatim coronatis ; labro tenui, 

 sinu lato ; canali elongato, recto. 



The chain Pleurotoma. Shell elongately fusiform, 

 turrited, acuminated, yellowish grey ; whorls very 

 convex in the middle, as if suddenly swollen, 

 crowned with a series of oblique, very delicate, 

 white tubercles ; lip thin, sinus broad ; canal long 

 and straight. 

 Hab. ? 



The leading feature of this new and very distinct shell 

 is the bright, perlaceous series of link-shaped tubercles 

 which run round the periphery of the whorls. 



Species 37. (Brit. Mus.) 



Pleurotoma fulminata. Pleur. testd fusiformi, svb~ 

 pyriformi, Levi, albidd, flammulis maculisque rubris 

 longitudinaliter fulminata ; anfractu ultimo versus 

 basin transverse striato, striis prqfundis ; canali me- 

 diocri, leviter arcuato. 



The lightning-marked Pleurotoma. Shell fusiform, 

 somewhat pear-shaped, smooth, whitish, longitudi- 

 nally streaked with reddish flames and spots ; last 

 whorl very deeply striated towards the base : canal 

 middling, slightly curved. 



Kiener, Icon., pi. 10. f. 2. 



Hab. ? 



M. Kiener is mistaken in supposing this to be the 

 shell figured in Sowerby's genera under the title of PL 

 lineata, var. 



