102 YIAOCKKK MOTJ.USCA. 



Diincnsi()iii<. — L. 55 mm. B. 27 mm. 



Dlstrihiitioii. — Recent : Finmai'k, Lofoten Islands, Iceland, Spitzbergen. 



FoskU : Waltonian Crag: Little Oakley (very rare). Pleisto- 

 cene : Norway. 



Bemarls. — This is another of the northern species of moUusca which made 

 their first appearance in the Crag basin at the Oakley stage, a group fairly 

 numerous as to species, excessively rare as to specimens : I have obtained but one 

 or two from the small pit at Oakley which has yielded me a fauna of such extra- 

 ordinary variety and richness as the result of many years' work. B.finmarchianniit 

 was dredged by the Norwegian North Atlantic Expedition at a depth of 127 

 fathoms. 



The imperfect shell here represented has been recognised by Dr. 0yen as 

 B. finmai'chianain; I give it on his authority. It corresponds more nearly with 

 one of the specimens figured l^y Prof. Kobelt in 1883, op. cit., pi. Ixxvii, fig. 4, than 

 with those given by Prof. G. 0. Sars, being wider and shorter in the spire than 

 the latter. 



Buccinum perdix (Beck), Morch. Plate IX, figs. 13, 14. 



1868. Tritonium groenJandicum, var. perdix. Beck, in MiJrcli, Fauu. Moll. Isl., p. 27. 

 1877. Tritonium perdix, Beck, Morch, in Rink, Dan. Greenl., p. 438. 



1877. Buccinum perdix, Morch and Poulseu, MS. list and plates in the G-eological Museum, Copen- 

 hagen, no. 21, pi. iii, fig. 4 (unpublished). 

 1899. Buccinum perdix, Posselt, Medd. om G-ronl., vol. xxiii, p. 203, pi. ii, figs. 9, 13. 



Specific CJtaracters. — Shell rather small, ovato-conical ; whorls G or 7, convex, 

 in the Crag specimens decidedly so, the last two-thirds the total length ; ornamented 

 by fine and incons})icuous spiral stri^, and usually by longitudinal plications which 

 are not very prominent, and tend to die away towards the base of the shell, 

 together with varix-iike foldings on the body-whorl ; suture deep ; spire regularly 

 diminishing in size, ending in a small and blunt point; mouth oval, shorter than 

 the spire, rather wide ; inner lip forming a thin glaze upon the pillar ; pillar 

 twisted ; canal short, open. 



Dlinensions. — L. 30 — 35 mm. B. 15 — 20 nnu. 



Distribution. — Recent : Iceland, west coast of Greenland. 

 FossU : Waltonian Crag : Little Oakley. 



Remarks. — In 1899 Posselt grouped together B. fiiimarchiainmi £ii\d B. Hiim- 

 2)]ireysianum under Beck's name of B. perdix, associating with them some shells 

 differing materially from the forms figured as typical of the two first-named species 

 by Profs. G. O. Sars and Kobelt, which are without longitudinal plications and 

 have whorls l)ut little convex. Three of those figured as B. perdix by Posselt, on 



