MALACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 1 65 



outer side ; the proboscis long, cylindrical ; thicker 

 toward the end ; the foot rather large, elliptical ; the 

 operculum ovate, concentrically striate, thin, horny. 



Shell ovate, elongated ; the spire moderate, pointed ; 

 the aperture roundish or oval, with a deep narrow oblique 

 notch anteriorly ; the columella rounded, plaited, generally 

 with a mass of callosity ; the outer lip thickened with a 

 strong external rib. 



Marine mollusca, similar in habits to the Buccina. 

 Young shells, not having the lip thickened, present all 

 the characters of that genus. 



1. Ndssa incrassdia. Black-spot 1\ asset. 



Shell ovato-conical, thick ; with the spire tapering to a 

 bluntish point ; the turns convex, longitudinally grooved, trans- 

 versely ribbed, nodulose at the intersections of the ridges ; the 

 first three turns smooth and glossy, the last about the same 

 breadth as the length of the spire ; the suture distinct ; the 

 mouth ovato-elliptical, the outer lip much thickened with a 

 strong external rib, and internal plica? ; the notch short, deep, 

 and narrow ; the columella callous, with oblique ridges ; the 

 exterior white, reddish, pink, brown, or variegated, the tip 

 pink; the mouth and lips white, a dusky spot over the notch. 

 Length half an inch, breadth a quarter. 



Sometimes covered with a yellowish or olivaceous epidermis ; 

 the rib of the outer lip sometimes smooth and white, or white 

 and grooved, or of the same colour as the rest of the shell. 

 Some individuals elongated, others abbreviated. 



Animal pale yellow, spotted with black ; the tentacula fili- 

 form, but bulging at the base ; the branchial siphon long, 

 variegated with brown and black ; the proboscis long, thicker 

 toward the end ; the foot large, pale yellow. 



Tritonium incrassaturu. Mull. Zool. Dan. Prodr. 244. — Nassa 

 incrassata. Flem. Brit. Anim. 340. — Xassa incrassata. Johnst. Berw. 

 Tr. iii. 238.— Buccinum Macula. Mont. Test. Brit. 241. PI. 8. 

 f. 4. — Buccinum minutum. Penn. Brit. Zool. iv. 122. PI. 79. 



About low-water mark, and in deep water, at Stonehaven, 

 near Aberdeen, Cruden, Peterhead, Boddam, Banff, Portsoy, 

 and other parts of the coast ; frequently cast on the beach, 

 and sometimes brought up by the lines. 



