278 PLIOCENE MOLLUSOA. 



of some of the Arctic Belas by Jeffreys with B. tnrricula, he agrees with 

 Troschel and Prof. G. 0. Sars that the latter is " perfectly different,"^ and cannot 

 be regarded as a parent form. He does not even group them with B. rugulata, 

 to which he thinks they have a closer affinity, because he is desirous of elucidating 

 their geographical distribution. In the following pages I propose to regard these 

 northern forms as specifically distinct, under the names generally adopted by 

 Scandinavian conchologists. 



I doubt whether any of the specimens figured by Wood as B. turricula 

 represent the typical British species, and I am not aware that any verified 

 specimens of the latter have been reported from polar seas.^ 



It seems to me that B. tnrricula may be regarded as a distinct species, which 

 may be easily distinguished from the northern Belas, differing from them, both in 

 form and sculpture, more widely than some of them, regarded as specifically 

 different, do from each other. 



Bela scalaris (MoUer). Plate XXXI, figs. 1—4. 



1841-70. Fusus turricula, aould, Rep. Inv. Mass., ed. 1, p. 292, fig. 19-3, 1841 ; Bela turricula, ed. 2, 



p. 351, fig. 620, 1870. 

 1842. Defrancia scalaris, MoUer, Ind. Moll. Groenl., p. 12. 



1872. Pleurofoma scalaris .^ S. V. Wood, Mon. Crag Moll., 1st Suppl., pt. i, p. 39, pi. iii, fig. 12. 

 1878. Bela scalaris, G. O. Sars, Moll. Eeg. Arct. Norv., p. 229, pi. xxiii, fig. 5. 

 1S86-1901. Bela scalaris, Friele, Norske Nordli. Exped. (Mollusca), pt. ii, p. 6, pi. vii, figs. 10, 11 ; 



pi. ix, figs. 16—20, 1886 ; vol. iii, p. 89, 1901. 

 1887. Bela scalaris, Kobelt, Martini und Chemnitz, Concb. Cab., ed. 2, vol. iv (Pleurotoniidae), p. 161 , 



pi. xxxiii, fig. 1. 

 1893. Plenrofonia scalaris, A. Bell, Proc. Roy. Phys. Soc. Edin., vol. xii, p. 22. 

 1899. Bela nohilis, var. scalaris, Posselt, Medd. om. Gronl., vol. xxiii, p. 149. 

 1905. Bela iurricula scalaris, Kobelt, Icon, schalentrag. europ. Meeresconcb., vol. iii, p. 239, pi. 



Ixxxii, figs. 10, 11. 

 1912. Bela turricula, var. scalaris, Dautzenberg et Fischer, Camp. Scient. Pr. Monaco, vol. xxxvii 



(MoUusques), p. 42. 



Specific Oliavaclers. — Shell solid, turreted, sub-fusiform ; whorls 7 — 8, slightl}" 

 conve.v, regularly tapering, the last about two-thirds the total length, strongly 

 angulated, with a sloping shelf below the suture ; ornamented by about twenty 

 longitudinal costae, not very prominent, narrower than the spaces between them,, 

 slightly nodulous on the keel, obliquely continuous upon the shelf, as well as by 



1 Norske Nordh. Exped. (Mollusca), pt. ii, p. 7, 1886. 



2 The name of B. turricula occurs iu a MS. list of Walton fossils compiled by the late R. G. Bell 

 and Prof. Kendall many years ago. At that time all the Crag Belas were included under that name, 

 as stated above, and as, indeed, is still largely the case. I know of no evidence to show that the 

 typical B. turricula occurs at Walton. 



