&ALACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 163 



striate ; the last whorl rather broader than the length of the 

 spire ; the suture distinct ; the mouth ovato-oblong, with the 

 outer lip rather thin, but sometimes thickened, the notch 

 distinct, the columella with an oblique indistinct groove ; the 

 colour whitish, pale red, or brownish-red ; the epidermis more 

 or less villous, yellowish-grey or brownish ; the inside white, 

 tinged with red or yellow. Length from four to five inches, 

 breadth from two to two-and-a-half. 



Animal elongated, spiral ; with the head anteriorly depressed, 

 with two tapering flattened contractile tentacula, each having 

 a lobe at the base externally, bearing a very small black eye ; 

 in the mouth an exsertile, cylindrical proboscis, about an inch 

 long, containing 'a long filiform bright red lingual mass, the 

 foot large, oval-oblong, marginate ; the operculum of an irre- 

 gular oval shape, concentrically striate ; the penis very large, 

 about two inches long, flattened, subclavate, obliquely striate, 

 with a papillar prominence on the left side near the end ; an- 

 terior part of the mantle membranous, a little thickened at the 

 margin ; the siphonal canal short, and emarginate ; the bran- 

 chiae long, unequal, striate ; the muscle of adhesion large, 

 flattened. The general colour is yellowish-white, the tentacula 

 yellow, the margin of the mantle reddish or yellow. 



The shell varies greatly in the prominence of the undulated 

 ribs, w r hich are sometimes obsolete on the spire, and entirely 

 absent on the last whorl. Individuals having the shell very 

 thin, without ribs, have by many been considered as a distinct 

 species and named Buccinum striatum. Young shells are fre- 

 quently banded with brownish-red. 



The nidus is composed of a great number of whitish mem- 

 brano-cartilaginous, roundish, thin sacs, convex on one side, 

 concave on the other, united by a ligament into a roundish 

 mass ; each sac with an internal delicate membrane and con- 

 taining three or four young, which at the period of exclusion 

 have the shell already well-formed, with about four whorls. 



The animal is sometimes used for bait. 



Abundant along the coast from Stonehaven to Banff; very 

 frequently taken up by the fishing-lines, and often cast on shore. 



Buccinum imdatum. Linn. Syst. Nat. 1204. Buccinum unda- 

 tum. Penn. Brit. Zool. iv. 121. PI. 73. f. 90. Buccinum striatum. 

 Perm. Brit. Zool. iv. 121. PI. 74. f. 91. ; Ed. n. iv. 272. PI. 77. 

 Buccinum undatum. Mont. Test. Brit. 237. Buccinum crassum, 

 rufescens, striatum et undatum. List. Anim. Angl. 156. PI. 3. f. 2. 

 Buccinum tenue, leve, striatum et undatum. Lister, Anim. Angl. 

 157. PI. 3. f. 3. Buccinum undatum. Flem. Brit. Anim. 342. 



