Bela Schantarica, Midd. 
PI. VIII, Fig. 20 a, 3, PI. X, Fig. 17, 18, 
Pleurotoma Schantaricum, Middendorff. 
Beitr. Mall. Ross. Pag. 118. 
udibir. Beise+ Pag, 223, Pl. XII, Fig. 17—19. 
Pleurotoma violacea, var. gigantea (Mørch) Leche, ,,Hafs- 
moll.* Sv. Vet. Akad. Handl., Bd. 16, Pas. 57, Tab. 
li Te I), 
Formen oval fusiform, Vindingerne tumide, underti- 
den svagt kjølede, undertiden afrundede (det sidste hyppigst), 
-Mundaabningen længere end Spiret og ikke meget udvidet, 
Kanalen kort og bred; Sculpturen, fine, tætte undulerede 
Spirallinier og axiale Folde, der hos udyoxne Exemplarer 
paa sidste Vinding ofte næsten forsvinde; hyorimod de 
altid vil gjenfindes paa de øvre Vindinger. 
Om Apex kan jeg intet oplyse, da alle mine Exem- 
plarer har denne Del af Skallen eroderet. 
Operculum, Fig. 20 0. 
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 
af B. simplex, Midd. Jeg tør ikke paastaa. at man maaske 
ikke skulde finde Mellemformer imellem disse to, men uag- 
tet jeg har ganske vakre Svitter af begge 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 øvre Vindin- 
ger, og hos unge Individer (Fig. 20 a) er disse ogsaa 
paa Hovedvindingen stærkt fremtrædende, og Spiret, naar 
det ikke er for stærkt eroderet, forholdsvis længere. 
Prof. Leche! kommer til samme Resultat, at begge 
disse Former ikke godt kan sammenblandes, og fremhæver 
yderligere, 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 U. S. Nat. Museum Pag. 524, 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 Brodering. Da jeg imidlertid 
ikke har seet Exemplaret, tør jeg ikke udtale mig afgjorende. 
“(Chin te, Letra, aS}, 
Den norske Nordhavsexpedition, Herman Friele: Mollusca. II. 
17 
Bela Schantarica, Midd. 
PI. VII, figs. 20 a, 5, PI. X, fig. 17, 18. 
Pleurotoma Schantaricum, Middendorff, Beitr. Mall. Ross 
pag. 118. 
»sibir. Reise“ pag. 223, Pl. XII, fig. 17—19. 
Pleurotoma violacea, var. gigantea (Mørch) Leche, ,,Hafs- 
moll.“ Sv. Vet. Akad. Handl., Bd. XVI, pag. 57, 
Tae, i 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 fine, close, undulated spiral striations 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, 
my specimens this part of the shell was eroded. 
Operculum, fig. 20 0. 
The teeth (Pl. X, figs. 17—18) ensiform, with a short 
manubrium. 
Habitat: 
fathoms. 
Dr. Jeffreys considered this form to be only a var- 
iety of B. 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 simplex is always smooth, with a fine chagreen- 
like spiral sculpture, and a very short spire. B. Schanta- 
ricd, on the other hand, is never without longitudinal 
folds on the upper whorls, and young individuals 
(fig. 20 a) these are prominent on the body whorl, and the 
spire is, when not too greatly eroded, relatively longer. 
Prof. Leche* arrives at the same conclusion, viz. that 
these two forms cannot well be placed together, and aecent- 
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 U. S. Nat. Museum, p. 524, 
Pl. II, fig. 8, Prof. W. H. Dall has described a Bela muwr- 
dochiana which is closely allied to Middendorff’s species. 
The sculpture accords, and the very short spire appears, 
to judge from the illustration, to be due to a strong ero- 
as in all 
Spitzbergen (Magdalene Bay) 30-50 
in 
sion. As I have, however, not seen the specimen I can- 
not speak definitely. 
T Op: c: pas. 58. 
