Bela Schantarica. Midd. 



Pl. VIII. Pig. 20 ... 6, Pl, x. Fig. i:, is. 



Fleurotoma Schantaricum, Middendorff. 



Beitr. Mull. Koss. Pag. l is. 



..Sibir. Beise"- Pag. 223, Pl. XII. Pig. 17— l 1 .). 

 Fleurotoma violacea, var. gigantea (Mørch) Leche, „Hafs- 



111011." Sv. Vet. A.kad. Handl.. Bd. 16, Pag. 57, Tal). 



1. Pig. 19. 



Fonnen oval fusiform, Vindingerne tumide, underti- 

 den svagt kjølede, undertiden afrundede (det sidstc hyppigst i, 

 Mundaabningen længere end Spiret og ikke meget udvidet, 

 Kanalen kort og bred; Sculpturen, tine, tætte undulerede 

 Spirallinier og axiale Folde, der hos udvoxne Exemplarer 

 paa sidste Vinding ofte næsten forsvinde; hvorimod de 

 altid vil gjenfindes paa de ovre Vindinger. 



Om Apex kan jeg intet oplyse. da alle mine Exem- 

 plarer har denne Del at' Skallen eroderet. 



Operculum, Fig. 20 U. 



Tænderne, Tab. X. Fig. 17 — 18. sværdformede med 

 et kort Manubrium. 



• Forekomst : Spitzbergen ( Magdalenebay) 30 — 50 Favne. 



Dr. Jeffreys holdt denne Form for kun en Varietet 

 at' B. simplex, Midd. Jeg tor ikke paastaa, at man maaske 

 ikke skulde finde Mellemformer imellem disse to. men uag- 

 tet jeg har ganske vakre Svitter af hegge for mig. har 

 jeg dog ikke seet nogen Tilnærmelser. 



Bela simplex er altid glat med en fin chagrineret 

 Spiralsculptur og et meget kort Spir. B. Schantarica 

 mangler derimod aldrig Længdefolde paa de ovre Vindin- 

 ger, og hos unge Individer (Fig. 2» > a) er disse ogsaa 

 paa Hovedvindingen stærkt fremtrædende, og Spiret, naar 

 det ikke er for stærkt eroderet. forholdsvis hengere. 



Prof. Leche 1 kommer til samme Resultat, at begge 

 disse Former ikke godt kau sammenblandes, og fremhæver 

 yderligére, hvad ogsaa er noteret i ovenstaaende Diagnose, 

 at Vindingerne er svagt vinklede hos sidstnævnte Art. 

 Leche holder imidlertid begge Former for Varieteter af 

 Bela violacea, Migh. 



I Proc. of F. S. Xat. Museum Pag. 1)24. Pl. II. 

 Fig. 8 har Prof. W. H. Dall beskrevet en Bela murdochiana, 

 som staar Middendorffs Art meget nær. Sculpturen kan 

 passe og det meget korte Spir synes efter Tegningen at 

 dømme, at skyldes en stærk Erodering. Da jeg imidlertid 

 ikke- har seet Exemplaret, tor jeg ikke udtale mig afgjørende. 



■ . Pag "- 



Bela Schantarica. Midd. 



Pl. VIII. figs, '-'o a, /.. l'). X. fig. 17. 18. 



Fleurotoma Schantaricum, Middendorff, Beitr. Mali. Ross 



pag. US. 



..Sibir. Reise" pag. 223, Pl. XII. fig. 17 — 1U. 

 Fleurotoma violacea, var. gigantea (Mørch) Leche. „Hafs- 



moll." Sv. Vet. Akad. Handl.. VA. XVI, pag. 57, 



Pl. I, hg. 19. 



The shell ovo-fusiform ; the whorls tumid, occasionally 

 faintly angulated, occasionally rounded (most frequently 

 the last |. The aperture longer than the spire and not 

 much dilated; the canal short and wide; the sculpture 

 consists of tine, close, undulated spiral striatums and axial 

 folds, which, in adult specimens, often, almost disappear on 

 the ultimate whorl, whilst they, invariably, are recognised 

 on the upper whorls. 



Apex. Regarding it I can say nothing, as in all 

 my specimens this part of the shell was eroded. 



Operculum, fig. 'in h. 



The teeth (PI. X. tigs. L7 — 18) ensiform, with a short 

 manubrium. 



Habitat: Spitzbergen i Magdalene Bay) 30-50 

 fathoms. 



Dr. Jeffreys considered this form to be only a var- 

 iety of />'. simplex, Midd. I dare not affirm that we may 

 not. perhaps, be able to discover forms intermediate between 

 these two. but although I have before me very complete 

 consecutive sets of both of them. I have been unable to 

 detect any approaches to each other. 



Bela simple. r is always smooth, with a hue chagreen- 

 like spiral sculpture, and a very short spire. B. SchantOr 

 rica, on the other hand, is never without longitudinal 

 folds on the upper whorls, and in young individuals 

 (fig. 20 «) these are prominent on the body whorl, and the 

 spire is. when not too greatly eroded, relatively longer. 



Prof. Leche 1 arrives at the same conclusion, viz. that 

 these two forms cannot well be placed together, and accent- 

 uates, further, what has also been stated in the above 

 diagnosis; that the whorls are faintly angular in the last 

 named species. Leche. however, considers both forms to 

 be varieties of Bela violacea, Migh. 



In the Proceedings of the F. S. Xat. Museum, p. r>24. 

 PI. II. fig. 8. Prof. W. H. Dall has described a Bela mur- 

 dochiana which is closely allied to Middendorffs species. 

 The sculpture accords, and the very short spire appears, 

 to judge from the illustration, to be due to a strong ero- 

 sion. As I have, however, not seen the specimen I can- 

 not speak definitely. 



1 Op. c. pag. " -. 



Den norske Nordhavsexpedition. Herman Friele: Mollusca. II. 



