PLEUROTOMA.— Plate VI. 



md highly deserving the distinction given to it by 

 Kiener. 



Species 47. (Mus. Cuming.) 



Pleurotoma MAURA. Pleur. testa turritd, acuminatd, 

 fusco-nigricante ; anfractibus medio tuberculatis, 

 inferni punetato-striatis, superne depressione sinum 

 labri sequente ; eanali recurvo. 



Vhe dark-coloured Pleurotoma. Shell turri ted, acu- 

 minated, blackish brown ; whorls tuberculated in 

 the middle, dotted round the lower part, whilst the 

 upper part exhibits a depression from the rilling up 

 of the sinus ; canal recurved. 



sowerby, Pro. Zool. Soc, 1833, p. 134. 



EIeeve, Conch. Syst., vol. ii. pi. 133. f. 4. 



Hub. Island of La Plata, west coast of Columbia (found 

 in coral sand at the depth of fourteen fathoms) ; 

 Cuming. 



Care should be taken not to confound this beautiful 

 ihell with the PI. maura of Valenciennes described and 

 igured by Kiener. 



Species 48. (Mus. Sinfield.) 



Pleurotoma echinata. Pleur. testd turritd, tubercu- 

 lato-echinatd, albidd, maculis elongatis rufescentibus 

 radiutim pictd ; anfractibus medio angulatis, angulo 

 tuberculis acutis, subcompressis, armato ; eanali brevi, 

 attenuate. 



rHE prickly Pleurotoma. Shell turrited, prickly, 

 tuberculated, white, radiately painted with long, 

 reddish brown spots ; whorl? angulated in the 



middle, angle armed with sharp, slightly com- 

 pressed tubercles ; canal short, attenuated. 



Lamarck, Anim. sans vert., vol. vii. p. 91 ; Enc. Meth., 

 pi. 439. f. 8. 



Hob. Coast of New Guinea ; Kiener. 



This species is remarkably distinct from any other of 

 the genus ; I only know of few specimens. 



Species 49. (Mus. Cuming.) 



Pleurotoma turricula. Pleur. testd acuminato-pyra- 

 mida/i, fused ; anfractibus superne tuberculatis, tuber- 

 culis inserieunicd dispositis; inferne longitudinaliter 

 cost at is, costis decussatis ; apcrturd fauce purpureo- 

 nigricante ; eanali brevi. 

 The turriculated Pleurotoma. Shell sharply pyra- 

 midal, brown ; whorls with the upper part tubercu- 

 lated, tubercles in a single row; lower part longitu- 

 dinally ribbed, ribs decussated ; interior of the aper- 

 ture blackish purple ; canal short. 

 Sowerby, Pro. Zool. Soc, 1833, p. 137. 

 Reeve, Conch. Syst., vol. ii. pi. 233. f. 6. 

 Testa minor. 



' Pleurotoma corrugata, Sowerby (not of Kiener), 



Pro. Zool. Soc, 1833, p. 137. 

 I have carefully examined the identical specimens de- 

 scribed by Sowerby under the separate specific names 

 of PI. turricula and corrugata, but am unable to discover 

 the slightest difference between them ; the distinction 

 which he claims for the latter, of the tubercles assuming 

 the nature of a tuberculated keel, is quite imaginary. 

 Such an error is, however, most excusable, when it is 

 considered with how vast an amount of new material he 

 was at the time occupied. 



