15 



Forekomst: St. 33, 124. 137, 267, 270, 312, 323, 

 326. 363, 370 og .'174 Era 60 til'658 Favne. 



Synonomien er her gjort noget vidtloftig. men neppe 

 foldstændig, for at vise don Ramme, indenfor hvilken jeg 

 vil have Arten forstaaet 



Hvad angaar det Navn. der bør have Præceduncen, 

 da kan jeg med Sikkerhed ikke afgjøre dette, tin baade 

 Morchs og Jeffreys Forfatterskab skriver sig fra 1867. 



I "Catalog der auf dor Norweg. Nordmeer Exped. 

 boi Spitzbergen gefundenen Mollusken" Pg. 280 fremsatte 

 jeg den Paastand, at der findes alle Overgange imellom N. 

 togata Mørch i Sabinii Jeffr. | og cwrta Jeffr. | Stimpsoni Mørch). 

 De 5 Exemplarer, dor er illustreret Tab. II. Fig. i— .">, vil 

 antagelig bevise det berettigede i denne Paastand. Ved i 

 Frankfurt at' Main at faa Anledning at se en smuk Blekke 

 af N. curia, som Herr Verkrttzen havde hjembragt fra Ny- 

 fundland, faldt den store Overensstemmelse imellem begge 

 Former mig straks i Ojnene. og ila jeg for Sammenlignings 

 Skyld havde medbragt flere af mine Spitsbergen Exemplarer 

 blev ogsaa Dr. Kobelt opmerksom paa at lier neppe kunde 

 foreligge 2 distincte Arter. Fig. 5 er saaledes meget lig 

 den i System. Concli. Cabin HI Pg. 1U5 Tat'. 35 Fig. 4 

 og 5 afbildede A". Stimpsoni rar. der er etter et af Ver- 

 kriizens Exemplarer. 



Fig. 4 (fra St. 326 imellem Beeren Island og Spits- 

 bergen! er en grovribbet Form. der. hvad Sculptur angaar, 

 kommer N. Spitzbergensis Reeve nær, men don hos denne 

 eiendommelig udvidede Mundaabning mangler. 



Fig. 6 synes at antyde en Tilnærmelse til A r . rentri- 

 cosa Gray. 



Det storste Exemplar ('fra St. 374 Spitzbergen) maaler 

 77"" 1 lang og dog er de 3 øverste Tophvirvler borte. Den 

 arctiske Form opnaar saaledes en Størrelse, som ikke staar 

 tilliage for den nordamerikanske. 



Dr. Jeffreys har opført som Fusus Sabinii Synony- 

 mer: F. Spitzbergensis og turtuosus Reeve, samt ebtir, togatus 

 og Pfaffi Morcb. Hvad de to sidste angaar. da er jeg 

 enig i at slaa dom sammen med F. Sabinii, Jeffr., men min 

 Opfatning af X. (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 etter Formen 

 af Skallen at dømme, skulde jeg nærmest tro at den til- 

 hører N. (Siphonorbis) twrrita, Sårs og især tyder den ind- 

 knebne dybe Canal herpaa. 



Dgret iTah. I. Fig. 26) er stort, hvidt; Foden længer 

 og noget bredere end Skallen; Sipho lang og tyk: Ten- 

 t;iklerne middelniaadig lauge, ooniske. noget tykke ved Basis, 

 hvor et Par smaa Øine sidde. 



Apex ,Tab. II. Fig. 7 a, b, c, di er i Regelen en Smule 

 skjævbøiet, ophøiet og første Enihryonalvinding sterkt af- 

 smallende. Dr. Morell opfører N. togata og Pfaffii under 

 Siphonorbis sammen mod ebur. Men i Apexbygningen imel- 



Babitat: Stats. 33. 124. 137. 267. 270,312, 323, 

 326, 363, 37(>. and 374: from 60 to «58 fathoms. 



The synonymy is hero given somewhat at length, 

 tin nigh 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 moans of deciding, since the authorship of both 



Morch and Jeffreys dates from L867. 



\ 



In -Catalog der auf der Norweg. Nordmeer Exped. 

 bei Spitzbergen gefundenen Mollusken." p. 280. I confidently 

 asserted that all transition-forms between N. togata. Morch, 

 (Sabinii, Jeffr.) and curia, Jeffr. (Stimpsoni, Morch), are met 



with. The 5 specimens represented in Pi. n, tigs, l— .".. 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. CUrta, which 

 HeiT 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. 



F'ig. 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 tig. 6 would appear to approx- 

 imate N. rentricosa, 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 synonomy of 

 Fusus Sabinii. viz. F. Spitzbergensis and turtuosus, of Reeve, 

 and F. ebur, togatus, and Pfaffi. of Morch. Regarding the 

 two latter. I. too, am quite willing to unite them with F. 

 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 turtuosus 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) turritu. M. Sars. 



Animal (PI. I. tig. 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, b. e, ,i) as a rule slightly ob- 

 lique, prominent, and with the first embryonic whorl rapidly 

 diminishing. Dr. Morch has referred A. togata and Pfaffi 

 to Siphonorbis, along with ebur. In the structure of the 



