NASSA.— Plate XVIII. 



The decussated Nassa. Shell ovately conical, twisted 

 at the base, whitish, stained and obscurely banded 

 with brown ; whorls angled in the middle, trans- 

 versely thread-ridged, longitudinally plait-ribbed, ribs 

 compressly noduled at the angle ; aperture rounded, 

 interior ridged, columella callously laminated. Up 

 varicose. 



Kiener, Icon. coq. vivantes, p. 109. pi. 30. f. 3. 



Hah. Brisbaue Water, East Australia ; Strange. 



More angular and less varicose than the preceding 

 species. 



Species 122. (Mus. Cuming.) 



Nassa nivea. Nms. tenia pyrmnidali-conicd, Candida; 

 sjiird acuta, suturd impressd ; anfractibics planulatis, 

 longitudinaliter siibdutanter plicatis, traiisversim snl- 

 catis ; aperturd pand, fauce liratd, columelld lamind 

 callom, lahro mnplici. 



The snowy Nassa. Shell pyramidally conical, white; 

 spire sharp, suture impressed ; whorls flattened, longi- 

 tudinally rather distantly plaited, transversely grooved; 

 aperture small, interior ridged, columella with a callous 

 lamina, lip simple. 



A. AD.1.MS, Pro. Zool. Soc. March 1851. 



Hah. Batangas, Island of Luzon, Philippines (in coarse 

 sand at twenty-one lathoms) ; Cuming. 



A solid colourless pyramidally conical species, sculptured 

 with gentle ripple-like plaits, crossed with numerous linear 

 grooves. 



Species 133. (Mus. Cuming.) 



Nassa polygonata. Nasn. testd globoso-conicd, cram, 

 albidd, fnsco-rubente thiddet Uiieatd; spirdaculd ; an- 

 fradibus rotmidatk, longitud'maliter plicato-costatu, 

 transvenim filoso-Uratis ; aperturd parvd, fortiter li- 

 ratd, columelld laminatd et plicatd, lahro valde in- 

 crassalo, varicose. 



The many-angled Nassa. Shell globosely conical, 

 thick, whitish, stained and lineated with brown-red; 

 spire shai-p ; whorls rounded, longitudinally plicately 

 ribbed, transversely thread-ridged ; aperture small, 

 strongly ridged, columella laminated and plaited, lip 

 very thickened, varicose. 



Lamakck, Anim. sans vert. (Deshayes' edit.) vol. 10. p. 

 184. 



Hah. Isle of Camiguing, Philippines (in sandy mud at 

 thirty fathoms) ; Cuming. 

 A solid globose species, approaching in general aspect a 



well-known form of C'awcellaria. 



