Var clathratus. nub. 



Tab. VII Fig. J. 



Rundt Vindingernes Midte gaar en fremtrædende List 

 hvorved en stormasket gitret Sculptur fremkommer. 

 Forekomst: Station 270—136 Favne. 

 Operculum (Fig 2 6) er typisk lang oval. 



Var spitzbergensis. nob. 



Tab. VII Fig. 3, ;U, 4 og Tab. IX Fig. (i, Oa. 



Formen og Forholdet imellem Spir og Mundaabning 

 er typisk. I Skulpturen afviger nærværende Varietet ved 

 en stærkere fremtrædende Kjøl, der kan gaa over til en 

 skarp fremstaaende Kant (Fig. 4i og en noget kraftigere 

 Spiral striering. 



Operculum Fig. >> a synes at være noget bredere end 

 det typiske. 



Størrelse. Axiallængde 19"" Diameter 10""°. 



Tænderne (Pl. IX Fig. 6, 6 a) har en eiendommelig 

 Indskjæring paa den ene Side; Formen forøvrigt er den 

 brede typiske. Af 6 undersøgte Exempl. viste alle ufor- 

 andret den samme Struktur. 



Forekomst: Magdalenebay (Spitzbergen) 40 til 50 

 Favne. 



Dr. A. Krause, som forleden Sommer besogte mig. 

 har fundet denne Form i Beringshavet og hans Tegninger 

 af Tænderne stemme aldeles overens med mine. Han var 

 tilbøielig at holde den for en god Art væsentlig paa Grund 

 af dens udprægede Tandstructur. ' 



Var bergensis, nob. 



Tab. VII Fig. o a b o, >'. Tab. IX Fig. 7. 8. 



Spiret noget længere end Mundaabningen; axiale 

 Ribber talrigere end hos den typiske. 



Apex (Fig. o a !>) afrundet, første Vinding har 3 — 4 

 Spiralribber. 



operculum (Fig. 5 c) er ikke væsentlig afvigende fra 

 det typiske. 



Tænderne (Tab. IX Fig. 7. 8) har jeg hyppigst fun- 

 det som afbildet i Fig. 8 med det dybe Indsnit i Siden. 

 men den derfra væsentlig afvigende Form i Fig. 7 er imel- 

 lem forekommen. 



Forekomst: Under Expeditionen fandtes den ved 

 Sognefjordens Munding. Forøvrigt har jeg oftere fundet 

 den ved Bergen paa omkring 100 Favne, og Dr. Daniels- 

 sen har den fra Molde. Nordenfor dette Sted har jeg ikke 

 observeret den. Min afdøde Ven Dr. Jeffreys holdt den 

 for en god Art. 



1 Efteral na rværende Arbeide var færdig skrevet, har Ur. 

 Arth. Kran-.' været gaa venlig at send.' mig e1 Separataftryk af: 

 n Ein Beitrag zur Kenntnisz 'l. MoU. Fauna Beringsmeeres" , og jeg ser 

 deraf, al han har bibeholdt det af mig givne Navn for Formen. 



Var. clathratus, nob. 



Pl. VII flg. _'. 



Round the middle of the whorls, a projecting fillet 

 occurs, producing a coarsely cancellated sculpture. 



Habitat: Station No. 270. Depth 136 Fathoms. 

 The operculum (Fig. 26) is typically elongato-ovate. 



Var. spitzbergensis. nob. 



PI. VII figs. 3, :!«, 4 and PI. IX figs, fi, da. 



Shell, and the relations between the spire and the 

 aperture, are typical. This variety differs, in its sculpture, 

 in having a more protectant angle, which may occasionally 

 pass into a sharp protuberant edge (tig. 4), and in a some- 

 what more marked spiral striation. 



The open iilum (fig. 3a) appears to be somewhat broader 

 than the typical one. 



Size. The axial length 19 '; the diameter 10 



The teeth (PI IX tig. 6, 6 a) have a peculiar recess- 

 ment upon the one side; the form, otherwise, is the broad 

 typical one. Out of • > specimens examined, all showed the 

 same uniform structure. 



Habitat: Magdalene Bay (Spitzbergen). Depth, 40 — 

 50 fathoms. 



Dr. A. Krause, who visited me last summer, has 

 found this form in Behring's sea ; and his illustrations of 

 the teeth accord completely with mine. He was inclined 

 to regard it as a separate species, principally, on account 

 of its distinct dental structure. ' 



Var. bergensis, nob. 



Pl. VII fig. 5 a h c, l>, PI. IX fig. 7. R. 



The spire is somewhat longer than the aperture, and 

 the axial ribs are more numerous than in the typical form. 



Apex (fig. 5 a 6) obtusely rounded. The first whorl 

 has 3 — 4 spiral ribs. 



The operculum (fig. 5 c) is not materially different 

 from the typical one. 



The teeth (PI. IX fig. 7, 8), which I have most fre- 

 quently found, are like those illustrated in fig. 8, with the 

 deep recessment in the side, but the structure differing 

 materially from it, shown in fig. 7, occasionally appears. 



Habitat: It was found by the Expedition at the 

 mouth of the Sognefjord. 1 have, otherwise, frequently 

 found it near Bergen, in about 100 fathoms, and Dr. Dan- 

 ielssen has found it at Molde. To the North of that 

 place I have not observed it. My lamented friend Dr. 

 Jeffreys regarded it as a distinct species. 



1 Since the present work was written, Dr. Arth. Krause has 

 been so kind as to send me a copy "t' „Ein Beitrag zur Kenntnisz d. 

 Mull. Fauna Beringmeeres", and I see, from it. that he lias retained 

 Hi'' appelation which I have given to the form. 



