P L E U R T M ARIA. 



Genus PLEUROTOMARIA, De/rancc. 



Tt:<l<i Irocliiformi, intus nacrca, exlils cancellata ; an- 

 frartibns hn^ntis, medio vel supcrm' canali cicatriccv- 

 formi, arcitatim striata, spiraliter sculptis. 



Labium externum Jissrira elongatA incisd emar- 



i/itialiim. 

 SlicU trochif'orm, jiearly within, c;inceliated without; 



whorls turretod, spirally sculjitured in the ndddle 



01- al)ove with a scar-like, curved-striated canal. 



Outer lip emargiiiated with an elongated incised 



fissure. 

 Two species only oC this hitherto-supposed extinct 

 genus are now known. The fir.st was published in the 

 .Journal de Conchyliologie, in 1855, from the Island of 

 Marie (ialante. The other is in the collection of 

 M. Crosse, the present conductor of that work, who 

 de.scribed it in 1861 : both represented by unique 

 specimens. In the later and larger sjiecimen tlie lip 

 is so broken away that it does not exhibit the fissure, 

 which, however, is inferred by a spiral scar on the 

 uppc-r part of the whorls. 



Species 1. (Fig. <', /', Mus. Crosse.) 

 PLi:iitOT().M.\Ri.\ Ai).\NSON'lA.\A. Pie. testd mayna, 

 tiochifiinni, umhilico imiijno perforata, infra 

 coiivexo-planuLatd, omnino spiraliter liratd, liris 

 minoribus concentricis decussata, pallide lutesr.enti, 

 inacidis 'i~ufis irregularihus pictd ; anfractibus un- 

 ilccim, lente crescentibiis, prnpe sttturam obliipi!: 

 ptauulatis tunc angulatis ; cicatrice spiraii lata, 

 temiiter arcuatim stiiatd, ad angidum superioran 

 locato. 



Adan.son'.s Pleurotomauia. Shell large, trochiform, 

 perforated with a large umbilicus, flattened-convex 

 below ; spirally ridged all over, decussated with 

 smaller ribs ; pale yellowish, irregularly painted 

 with irregular red patches ; whorls eleven, slowly 

 increasing, obliijuely flattened near the suture, 

 then angular ; sjiiral cicatrix broad, with fine 

 curved strice, placed .at the upper angle. 



Crossk Axr> Fi.scilER. Jiiurnal de Conchyliologie, 18G1. 



Hob. Marie-Galante. 



Species 2. (Fig. a, h, Mus. De Burgh.) 



Pi,i:uR0T0MAiaA Qdovana. I'k. testd trochifurmi, can- 

 cellatd, imperforatd, corneo-piirpurasccnti , inandis 

 .ivbf/undratiii pictd ; npird moderate cleraUi ; an- 

 fractibus novem, sidirolundis ; cicatrice spiraii pro - 

 ftuuld, v<didi striata circa medium locatd ; f.ssurd 

 ebnu/atd. 



(Jl'oy's Pi.f.ui;uto.mai!IA. Shell trochiform, cancellated 

 imperforate, purj>lish-fleshy, painted with scjuare 

 patches ; spire moderately raised ; whorls nine, 

 rather rounded ; spiral cicatrix deep, strongly 

 striated, placed about the middle ; fissure elon- 

 gated. 



Fischer anh Beunarik. Journal de Conchyliologie, 

 \K)'), p. IG;'). 



Ilab. ? 



This species has no umbilicus, its whorls are fewer 

 than in the preceding species, and the cicatrix is in the 

 centre of the whorls, instead of being at the upper part 

 near the angle. 



February, 1874. 



