Sculpturen bestaar af meget fine Spirallinier og talrige, 
lidet bøiede, svage axiale Ribber, der ofte gaar over til 
fine Linier eller Vækststriber hvorved dannes et fint 
Netværk. 
Apex, Fig. 22 a, stump og glat. Første Vinding har 
omtrent samme Sculptur som de øvrige. 
Operculum ovalt. 
Tænderne, Tab. X, Fig. 19, ligne Bela Trevelyana. 
Forekomst: St. 35, 40, 240, 
fra 658 til 1333 Favne. 
Dr. Jeffreys sendte mig med sin sædvanlige Imøde- 
kommenhed Pleurotoma exigua fra ,Triton* Exped. til 
Sammenligning, men naar undtages, at den axiale Sculptur 
hos denne var noget kraftigere end paa mine Exemplarer fra 
de større Dyb i Nordhavet, fandt jeg ingen nævneværdig 
Afvigelse, og jeg kan derfor ikke betragte dem som arts- 
afvigende. Jeg skylder dog at tilføie, at min afdøde Ven 
var ikke enig med mig i denne Opfatning. Prof. Verrill har 
ligeledes været saa venlig at sende mig flere Exemplarer af 
Bela pygmæa. Disse stemme fuldstændig med vor Art. 
Verrill angiver Dybdeforholdene for B. pygmæa i ,2d 
Catalog* 1883 fra 312 til 1290 Favne. 
295, 283, 312 og 353 
Bela bicarinata, Couth. 
Pl. VIL, Fig. 18, 19, Pl. X, Fig. 15, 16. 
Pleurotoma bicarinata, Couthouy, Boston Journ. Nat. Hist. 
IL 1839, Pag, 104, Pl. 1, Fig. 11. 
Pleurotoma violacea, Migh. Proc. Boston Soc. Nat. Hist. I 
1841, Pag. 50. 
Defrancia cylindracea, livida & Beckii, Møller, Kroyers 
Tidsskr. 1842, Pag. 86 & 87, 
Bela bicarinata & violacea, G. O. Sars, Moll. reg. are. 
Pag. 237, Tab. 16, Fig. 11, 12 & Tab. 17, Fig. 2, 3. 
s bicarinata, Verrill, Cat. mar. Moll. 1882, Pag. 482 
Pl. LVIL, Fig. 16. 
At karakterisere denne Art er høist vanskeligt, thi 
baade Form og Sculptur er mere vexlende end i nogen 
anden af hele Slegten. Snart er Formen oval med Spiret 
omtrent af samme Længde som Mundaabningen, snart fusi- 
form med et længere stærkt tilspidset Spir; Vindingerne 
p 
er snart kjølede, snart afrundede cylindriske; Sculpturen — 
er snart overveiende kraftigst i den axiale Retning, snart 
i den transversale. Den typiske bicarinata har saaledes 
meget stærke Spiralribber uden anden axial Sculptur end 
Væxtstriber, hvorimod Varieteterne violace og cylindracea 
ofte har ganske kraftige axiale Ribber og disse er altid, 
selv om de kun optræder som Væxtstriber, bøiede. Mest 
15 
open. The sculpture consists of very fine spiral striations 
and numerous, but slightly curved, faint, axial ribs which, 
frequently, pass into fine striations, or lines of growth and, 
thus, form a delicate reticulation. 
Apex (fig. 22 a) blunt and smooth. The first whorl 
has a sculpture much similar to the others. 
Operculium oval, 
The teeth (Pl. X. fig. 19) resemble those of Bela 
Tvevelyana. 
Habitat: Stats. Nos. 35, 40, 240, 283, 295, 312, 
353, in from 658 to 1333 fathoms. 
Dr. Jeffreys with his usual amiability sent me, for 
comparison, Pleurotoma exigua from the ,Triton* Expedi- 
tion, but, with exception that the axial sculpture was 
somewhat stronger than in my specimens from the vast 
depths of the North Atlantic ocean, I found no variation 
worthy of notice, between it and B. ovalis, and I cannot, 
therefore, consider them as distinguishable species. I ought, 
however, to add that my friend did not coneur in this 
conclusion with me. Prof. Verrill has, also, been so kind 
as to send me several specimens of Bela pygmea. These 
accord, completely, with our species. Verrill gives the 
Soundings for B. pygmea in “2nd Catalogue“ 1884, as 
from 312 to 1290 fathoms. 
7 
Bela bicarinata, Couth. 
PI. VIII, figs. 18, 19, Pl. X, figs. 15, 16. 
Pleurotoma bicarinata, Couthouy, Boston Journal Nat. 
Hist. II 1839, pag. 105, PI. I, fig. 11. 
Pleurotoma violacea, Migh. Proc. Boston Soc. Nat. Hist. 
I 1841, pag. 50. 
Defranaa cylindracea, livida & Beckii, Møller, Kroyer’s 
Tidskr. 1842, Pl. 86, 87. 
Bela bicarinata & violacea, G. O. Sars, Moll. reg. are. 
pag. 237, Pl. XVI, fig. 11, 12 and Pl. XVII, figs. 2, 3. 
» bicarinata, Verrill, Cat. mar. Moll. 1852, pag. 482, 
Pl. LVIL, fig. 16. 
It is extremely difficult to characterise this species, 
because both its form and sculpture are more variable than 
in any other of the whole genus. Sometimes the form is 
oval, with the spire about the same length as the aperture, 
and sometimes it is fusiform, with a long, strongly acu- 
minate spire. The whorls are sometimes angulated and 
sometimes cylindrically rounded. The sculpture is, oftén, 
by far the most prominent in the axial direction, and 
often, it is so transversally. The typical bicarinata 
has, thus, very prominent spiral ribs devoid of other sculp- 
ture than lines of growth, whilst the varieties violacea and 
cylindracea, frequently, have quite prominent axial ribs, and 
