BUCCINUM UNDATUM. 91 



Forbes and Haiilej, is not uncommon at Oakley and in the Scaldision of Belgium. 

 I have a somewhat similar Recent shell in my collection from Oban, on the west 

 coast of Scotland, and Dr. Nordmann has sent me another, nearly corresponding 

 to it, from Jutland. 



The specimens here represented show more accurately the character of this 

 variety prevalent at Oakley and elsewhere in the Red Crag and at Antwerp than 

 does that given by Wood. Our shells are larger and longer in the spire than his 

 figure, some of them attaining a length of 100 mm. by 55 mm. in breadth. 



Nyst does not notice this form.^ It has been found by Mr. van de A7ouver 

 rather abundantly, however, during some recent excavations at Antwerp. 



Var. striata, Pennant. Plate VI, figs. 6, 7. 



1777. Buccinum striatum, Penuaut, Brit. Zool., vol. iv, p. 121, tab. Ixxiv, fig. 91. 

 1848. Buccimmi undatum, var. striatum, S. V. Wood, Mon. Crag Moll., pt. i, p. 36, tab. iii, fig. I2h. 

 1867. Buccinum undatum, var. striata, Jeffreys, Brit. Couch., vol. iv, j). 286. 



1912. Buccinum undatum, var. siriato, Dautzenberg et Fischer, Camp. Scient. Pr. Monaco, vol. xxxvii 

 (MoUusques), p. 109, pi. iv, fig. 12. 



RentarJcs. — In this distinct form the longitudinal ribs are nearly or entirely 

 obsolete, the spiral lines being more or less regularly and clearly sculptured. It is 

 smaller and shorter than the last, measuring from 45 to 55 mm. in length and 

 30 to 35 mm. in breadth. It is fairly common at Oakley, and may be regarded as 

 one of the characteristic varieties of B. undatum in the Red Crag. 



Jeffreys reports it living from the coralline zone on the coasts of England, 

 Wales, and Ireland (not common), and Dr. Nordmann has sent me a somewhat 

 similar specimen from Jutland. 



Var. cserulea, G. 0. Sars. Plate VII, figs. 3, 4. 



1878. Buccinum undatuvi, var. cserulea, Gr. O. Sars, Moll. E,eg. Arct. Norv., p. 255, pi. xxiv, fig. 3. 

 1900-1. Buccinum undatum, var. cserulea, Br(^gger, Norges geol. unclersy)gelse, vol. xxxi,pl. xii, fig. 14. 

 1912. Buccinum imdatum, var. casrulea, Dautzeuberg ot Fischer, Camp. Scient. Pr. Mojiaco, vol. 

 xxxvii (MoUusques), p. 113, pi vi, fig. 2. 



Varietal Characters. — Shell ovato-conical, less solid than the type form; spire 

 more or less elongate, regularly tapering; apex blunt; whorls 6 or 7, the last 

 tumid, twice or three times the length of the spire; the upper whorls are generally 

 ornamented by inconspicuous longitudinal plications, but these are often obsolete 

 or nearly so ; the spiral sculpture is at times fine and indistinct, at others more 

 strongly marked, and there are flexuous and irregular lines of growth sometimes 



1 The shell figured by Nyst in 1881 as B. undatum approaches more nearly that given further on 

 as B. meridionale, var. inflata (PI. IX, fig. 3), than the typical form of the present species. 



