/ 
Forekomst: St. 33, 124, 137, 267, 270, 312, 323, 
326, 363, 370 og 374 fra 60 til 658 Favne. 
Synonomien er her gjort noget vidtløftig, men neppe 
fuldstændig, for at vise den Ramme, indenfor hvilken jeg 
vil have Arten forstaaet. 
Hyad angaar det Navn, der bør have Præcedencen, 
da kan jeg med Sikkerhed ikke afgjøre dette, thi baade 
Morchs og Jeftreys Forfatterskab skriver sig fra 1867. 
I “Catalog der auf der Norweg. Nordmeer Exped. 
bei Spitzbergen gefundenen Mollusken” Pg. 280 fremsatte 
jeg den Paastand, at der findes alle Overgange imellem N. 
togata Møreh (Sabini Jeffr.) og curta Jeftr. (Stimpsoni Mørch). 
De 5 Exemplarer, der er illustreret Tab. II, Fig. 1—5, vil 
antagelig bevise det berettigede i denne Paastand. Ved i 
Frankfurt af Main at faa Anledning at se en smuk Række 
af N. curta, som Herr Verkriizen havde hjembragt fra Ny- 
fundland, faldt den store Overensstemmelse imellem begge 
Former mig straks i Øjnene, og da jeg for Sammenlignings 
Skyld havde medbragt flere af mine Spitsbergen Exemplarer 
blev ogsaa Dr. Kobelt opmerksom paa at her neppe kunde 
foreligge 2 distinete Arter. Fig. 5 er saaledes meget lig 
den i System. Conch. Cabin III Pg. 105 Taf. 35 Fig. 4 
og 5 afbildede N. Stimpsoni var, der er efter et af Ver- 
kriizens Exemplarer. 
Fig. 4 (fra St. 326 imellem Beeren Island og Spits- 
bergen) er en grovribbet Form, der, hvad Seulptur angaar, 
kommer N. Spitebergensis Reeve nær, men den hos denne 
eiendommelig udvidede Mundaabning mangler. 
Fig. 6 synes at antyde en Tilnærmelse til N. ventri- 
cosa, Gray. 
Det største Exemplar (fra St. 374 Spitzbergen) maaler 
TU” lang og dog er de 3 øverste Tophvirvler borte. Den 
arctiske Form opnaar saaledes en Størrelse, som ikke staar 
tilbage for den nordamerikanske. 
Dr. Jeffreys har opført som Fusus Sabinii Synony- 
mer: F. Spitzbergensis og turtuosus Reeve, samt ebur, togatus 
og Pfaffi Mørch. Hvad de to sidste angaar, da er jeg 
enig 1 at slaa dem sammen med F. Sabinii, Jeffr., men min 
Opfatning af N. (Siphonorbis) ebur, Mørch er derimod be- 
tydelig afvigende, dog derom senere. Overfor Reeves Arter 
er jeg mere ubestemt. Dr. Jeffrys har havt den Venlighed 
at sende mig Reeves Type af Fusus turtuosus til Sammen- 
ligning, men den Karakter, som jeg havde haabet skulde 
give den mest paalidelige Oplysning, nemlig Apex, er des- 
værre i en mutileret Tilstand, saa det lader sig ikke med 
Sikkerhed afgjøre, hvor den hører hjemme, men efter Formen 
af Skallen at dømme, skulde jeg nærmest tro at den til- 
hører N. (Siphonorbis) turrita, Sars og især tyder den ind- 
knebne dybe Canal herpaa. 
Dyret (Tah. I, Fig. 26) er stort, hvidt; Foden længer 
og noget bredere end Skallen; Sipho lang og tyk; Ten- 
taklerne middelmaadig lange, coniske, noget tykke ved Basis, 
hvor et Par smaa Øine sidde. 
Apex (Tab. Il, Fig. 7 a, 5, e, å) er i Regelen en Smule 
skjævbøiet, ophøiet og første Embryonalvinding sterkt af- 
smallende. Dr. Mørch opfører N. togata og Pfaffii under 
Siphonorbis sammen med ebwr. Meni Apexbygningen imel- 
15 
Habitat: — Stats, 33, 124, 137, 267, 270, 312, 323, 
326, 363, 370, and 374; from 60 to 658 fathoms. 
The synonymy is here given somewhat at length. 
though not exhaustively, to indicate the limits I would 
assign for the species. 
As to which name has the right of priority, I have 
no certain means of deciding, since the authorship of both 
Mörch and Jeffreys dates from 1867. 
In “Catalog der auf der Norweg. Nordmeer Exped. 
bei Spitzbergen gefundenen Mollusken,” p. 280, I confidently 
-asserted that all transition-forms between WN. togata, Mörch, 
(Sabinii, Jettr.) and cwrta, Jeftr. (Stimpsoni, Mérch), are met 
with. The 5 specimens represented in PI. IT, figs. 1—5, will, 
it is believed, show this to have been a well-founded statement. 
Having had, during a stay at Frankfurt on the Maine, oppor- 
tunity of examining a beautiful collection of N. ewrta, which 
Herr Verkriizen had brought home from Newfoundland, I 
was immediately struck with the remarkable agreement 
exhibited by the two forms, and on producing several of 
my Spitzbergen examples, taken with me for comparison, 
Dr. Kobelt felt disposed to share my views concerning the 
probable identity of the species, which, in his opinion too, 
could hardly be distinct. 
Fig. 4 represents a thick-ribbed form (from Stat. 236, 
between Beeren Eiland and Spitzbergen), which, with regard 
to the sculpturing, approximates N. Spitzbergensis, Reeve: 
but the expanded mouth, peculiar to that species, is wanting. 
The form represented in fig. 6 would appear to approx- 
imate N. ventricosa, Gray. 
The largest specimen (from Stat. 374, Spitzbergen) 
measures 77”" in length, and yet the 3 top whorls are 
gone. The Arctic form attains, accordingly, a size fully 
equal to that of the North American. 
Dr. Jeffreys has given the following synonømy of 
Fusus Sabin, viz. F. Spitzbergensis and ivtuosus, of Reeve, 
and F. ebur, togatus, and Pfaffi, of Morch. Regarding the 
two latter, I, too, am quite willing to unite them with 7. 
Sabinii, Jeffr.; but my opinion of N. (Siphonorbis) ebur is 
very different, respecting which I shall have more to say. 
As to the two species of Reeve, I am more doubtful. Dr, 
Jeffreys has had the kindness to send me Reeve's type-spec- 
imen of Fusus tlrtuosus for comparison; but as the apex 
is broken, the most reliable character is lost, and its deter- 
mination must be a matter of doubt, though judging from 
the form of the shell and the deep, constricted canal, I am 
disposed to refer it to N. (Siphonorbis) turrita, M. Sars. 
Animal (Pi, I, fig. 26) large and white; foot longer and 
somewhat broader than the shell; siphon long and thick; ten- 
tacles of moderate length, conical, and bearing at the base, 
which is rather thick, a pair of small eyes. 
Apex (Pl. II, fig. 7 a, 5, ¢, d) ås a rule slightly ob- 
lique, prominent, and with the first embryonic whorl rapidly 
Dr. Mörch has referred N. togata and Pfaff 
In the structure of the 
diminishing. 
to Siphonorbis, along with ebur. 
w 
