16 



karakteristisk er den ikke meget lange Kauda og dybe, 

 brede Kanal. 



Apex hyder ingen Støtte som Artsmærke, da den 

 varierer etter Skallens Sculpturkarakter. 



Tab. VIII. fig. IS er en trekarineret Varietet fra 658 

 Favne iSt. 312). der synes at staa nær den af Verrill i 

 ovenciterte Arbeide afbildede. Jeg kan bekræfte Dr. Jef- 

 freys Iagttagelse, at Dybvandsformerne af denne Art er 

 hvide. hvorimod de fra grandt Vand er rodagtig eller rust- 

 farvede. 



Tænderne, Pl. X. Fig. 1"). 16, er sværdformede med 

 et noget langt Manubrium. 



Forekomst: 79. 124. 164, 173 &, 192, 200, 251, 260, 

 290, 312. 359. Magdalenebay (Spitsbergen) fra 30 til 658 

 Favne. 



Var. geminolineata. Fr. 



Tab. VIII. Fig. 19. 



..Catalog d. Spitzbergen Moll." (Jahrbiicher Mal. Gesell.) 



1879, Pag. 277. 



Formen fusiform. Spiret stærkt tilspidset og længere 

 end Mundaabningen. Den axiale Sculptur bestaar kun af 

 svage Vækststriber, Spiralsculpturen derimod af parvis op- 

 trædende Linier: paa næstsidste Vinding er der 4 saadanne 

 Liniepar. 



Der blev kun fundet et Exemplar paa 5 Favne. Ad- 

 ventbay (Spitsbergen). 



Denne hoist eiendommelig tegnede Varietet kommer 

 Varieteten lævior nærmest. 



Overgangen fra den typiske bicarinata til Formerne 

 cylindracea violacea og lævior ligger fuldstændig foran mig. 

 Fra St. 192 og 312. 650 og 658 Favne, altsaa Artens 

 dybeste Forekomst, haves Formerne: bicarinata, cylindracea 

 og lævior. Jeg opfatter her violacea i Overensstemmelse 

 med Prof. G. O. Sårs 1 . 



I begge disse Tilladde viser det sig. at unge Indivi- 

 der har den skarpeste og stærkest udprægede Sclulptur, 

 hvorimod de ældre, omend fuldstændig vel bevarede, har 

 Tilbøielighed kun at bevare den underordnede Spiralskulp- 

 tur. Dette stemmer i sine Principer overens med Prof. 

 Verrills Iagttagelser 2 . 



1 Moll. reg. are. Pl. 17. Fig. 2. 



- Cat. of Mar. Moll. 1882, Pag. Is::. 



these are invariably — even if they only occur as lines 

 of growth — curved. The most characteristic feature is 

 the, not very long, cauda, and the deep wide canal. 



Apex gives no assistance as a specific feature, because 

 it varies according to the sculptural character of the shell. 



PI. VIII. fig. 18 is a triply carinated variety, from 

 658 fathoms (station 312). which appears to he allied 

 to that illustrated by Verrill, in the above cited work.* I 

 can confirm Dr. Jeffreys observation that the deep-water 

 forms of this species are white, whilst those from the shal- 

 low-water are reddish, or rusty, in colour. 



The teetli. PI. X, fig. 15. 16. are ensiform, with a 

 somewhat long manubrium. 



Habitat: Stats. Xos. 79, 124. 164. 173?*. 192. 200, 

 251. 260, -2^K 312. 359. Magdalene Bay (Spitzbergen) 

 in from 30—658 fathoms. 



Var. gemminolineata, Friele. 



Pl. VTII. fig. in. 



Catalog d. Spitzbergen Moll. (Jahrbiicher Mal. Gesell) 



1879. Pag. 277. 



The shell fusiform; the spire strongly acuminate. 

 and longer than the aperture. The axial sculpture consists 

 of, only faint lines of growth, whilst the spiral sculpture 

 consists of lines occurring in pair's; in the penultimate 

 whorl there are 4 pairs of such lines. 



There was found, only one specimen, in 5 fathoms 

 depth, at Advent Bay (Spitzbergen). 



This highly remarkably distinguished variety approaches 

 most to the variety lævior. 



The transition, from the typical bicarinata to the 

 forms ri/liinhrtrea violacea and lævior. lies completely before 

 me. From Stations 192 and 312. in 650 and 658 fathoms. 

 consequently its deepest occurrence, we have the forms 

 bicarinata, cylindracea and lævior. I regard violacea in 

 accordance with Prof. G. O. Sars 1 



In both these cases, it is apparent that young indi- 

 viduals have the sharpest, and most distinctly marked, 

 sculpture, whilst the older ones, although perfectly well 

 preserved, have a tendency to retain only the subordinate 

 spiral sculpture. This accords, in its principles, with Prof. 

 Verrills observations 2 . 



1 ..Moll. reg. arc." Pl. XVII. fig. 2. 

 - Cat. el' Mar. Mull. 1882, pag. 4s3. 



