BELA DECUSSATA. 289 



unlike anything described in the recent concliological works that are accessible 

 to me. 



Posselt quotes Jeffreys' opinion, " Litora G-roenlandise subfossilis tantum notge," 

 but I cannot find the reference. 



Bela decussata (Couthouy). Plate XXXI, figs. 24—26. 



1889. Pleurotoina decussata, Couthouy, Bostou Journ. Nat. Hist., vol. ii, p. 183, pi. iv, fig. 8. 

 1841-70. Bela decussata, Gould, Rep. Inv. Mass., ed. 1, p. 280, fig. 185, 1841 ; ed. 2, p. 354, fig. 



623, 1870. 

 1842. Defrancia viridula, Miiller, lud. Moll. Groenl., p. 14. 



1884. Pleurotoina decussata, Jeffreys in Lamplugh, Quart. Journ. Geol. Soc, vol. xl, p. 320. 

 1886-1901. Bela decussata, Friele, Norske Nordli. Exped. (Mollusca), i)t. ii, p. 12, pi. viii, figs. 12, 



13 ; pi. X, figs. 12, 13, 1886; pt. iii. p. 91, 1901. 

 1887. Bela decussata, Kobelt, Martini und Chemnitz, Conch. Cab., ed. 2, vol. iv (Pleurotomidse), 



p. 153, pi. xxxii, fig. 6. 

 1899. Bela decussata, Posselt, Medd. cm Gronl., vol. xxiii, p. 152. 

 1905. Bela decussata, Kobelt, Icon, schalentrag. europ. JMeeresconch. , vol. iii, p. 252, pi. Ixxxiii, figs. 



20, 21. 

 1910. Bela decussata, Odhner, Kongl. Svensk. Vet-Akad. Handl. Stockholm, vol. vii, p. 10. 



Specific Characters. — Shell small, ovate, whorls convex, the last tumid; spire 

 short, less than one-third the total length ; ornamented with numerous sinuous 

 and inconspicuous longitudinal i*ibs which do not reach the base, and by faint 

 spiral strice ; suture clearly marked ; mouth oval, angulate above ; outer lip gently 

 rounded ; canal wide, very short ; columella excavated. 



Dimensions. — L. 8 — 12. B. 4—5. 



Dlxtrihution. — Recent : Tromso, Finmark, Iceland, Greenland, east coast of 

 North America, Faroe Channel, Nova Zembla, Kara Sea, Spitzbergen, Arctic 

 coasts of Siberia (Friele). 



Fossil : Icenian Crag : Norwich zone — Bramerton ; Weybourne 

 zone — East Runton. 



Pleistocene : Bridlington. Siberia. 



Remarks. — The Crag specimens here represented are from the Fitch collection 

 in the Norwich Museum and have been identified by Mr. Friele ; in both of them 

 the sculptui-e is almost obliterated. They differ in size and form, those from 

 East Runton being much shorter in the spire than that from Bramerton or than 

 in the North American shell described by Gould. For the Recent shell from 

 Greenland I am indebted to Dr. Odhner. The Bridlington specimen, from the 

 Headley Collection, is of the short-spired variety. 



Var. inflata, Posselt. Plate XXXI, fig. 27. 



1884. BeJa simplex, Jeffreys in Lamplugh, Quart. Journ. Geol. Soc, vol. xl, p. 320. 

 1889. Bela decussata, var. inflata, Posselt, Medd. om Grcinl., vol. xxiii, p. 154, pi i, fig. 4. 



37 



