PLEUROTOMA.— Plate XXVIII. 



anfra dibits superne et inferrie micarinatis, medio longi- 

 tudinaliter crebriliratis ; carinis albidis, anfractibus 

 medio cceruleo-fuscis, lirk albicantibus ,■ aperturd pared; 

 canali brevissimo. 



The four-banded Pleurotoma. Shell pyramidal, 

 whorls encircled with a single keel above and below, 

 longitudinally closely ridged in the middle ; keels 

 whitish, middle of the whorls blueish brown, ridges 

 whitish ; aperture small ; canal very short. 



Gkay, MSS. (private cabinet.) 



Sab. ? 



The band-like painting of the middle portion of the 

 whorls with the white ridges running across is very charac- 

 teristic. 



Species 252. (Mus. Metcalfe.) 

 (Magnified to nearly three times its natural length.) 

 Pleurotoma eeflexa. Pleur. testa ovatd, Tritoniformi, 

 concentrice costatd, Irausversini forliter liratd ; aper- 

 turd loiigiusculd sinuosd, labro reflexo, iufits denliculato. 

 The reflexed Pleurotoma. Shell ovate, Triton-shaped, 

 concentrically ribbed, transversely strongly ridged ; 

 aperture rather long, sinuous, lip reflexed, denticu- 

 lated within. 

 Reeve, Pro. Zool. Soc, 1845. 



Hob. ? 



Very much the aspect of some of the small Tritons. 



Species 253. (Mus. nost.) 



Pleurotoma quadrata. Pleur. testa ovatd, spird tnr- 

 ritd, anfractibus forliter angulalis, longitudinaliter 

 costatis, costis ad unguium mucronatis, infra sfriis 

 duabus elevatis cingulatis, anfractus ullimi parte infe- 

 rioriUrdmucronatd clatliratd; flavicante, costarum iu- 

 terstitiis rufo-castaneis ; sinu parvo. 



The squared Pleurotoma. Shell ovate, spire turreted, 

 whorls strongly angulated, longitudinally ribbed, ribs 



pointed at the angle, encircled beneath with two 

 raised stria;, lower part of the last whorl latticed with 

 ' a pointed ridge ; yellowish ; interstices between the 

 ribs reddish chesnut ; sinus small. 



Reeve, Pro. Zool. Soc, 1845. 



Ilab. ? 



A widely latticed shell of very characteristic growth. 



Species 254. (Mus. Metcalfe.) 



Pleurotoma parvula. Pleur. testa fusiformi-ocata, 

 anfractibus tumidiuscutis, longitudinaliter costatis, 

 transversim creberriuie liratis ; canali breviu-sculo ; 

 luteseeuie. 

 The small Pleurotoma. Shell fusiformly ovate, whorls 

 rather swollen, longitudinally ribbed, transversely very 

 minutely ridged ; canal rather short ; pale rusty 

 yellow. 

 Reeve, Pro. Zool. Soe. 1845. 



Sab. ? 



This species may be recognised by its delicate and closely- 

 latticed sculpture. 



Species 255. (Mus. Gray.) 

 (Magnified to three times its natural length.) 



Pleurotoma pentagoxalis. Pleur. testa oblongo-oratd, 

 lavigalii, longitudinaliter pentagonali, ad angulos com- 

 presso-coslatd, costis ad anfractuum parte swperwri 

 mueroiialis ; eburned. 



The pentgonal Pleurotoma. Shell oblong-ovate, 

 smooth, longitudinally five-angled, compressly ribbed 

 at the angles, pointed at the upper part of the ribs ; 

 ivory white. 



Gray, MSS. (private cabinet.) 



Sab. St. Vincents, West Indies ; Guilding. 



A minute species with five ribs on each whorl following 

 one under the other. 



