85 



Buccinum tenue. (i rav. 



Beechey*s Voy. is.",'.). Pag. L28, Pl. XXXVI. Fig. 19. 

 B. scdariforme(Beck) Møller, [nd. Moll. Groenl. 1842, Pag. 84. 



Forekomst: Stat. 326, 357, Xorskoerne (20—30 



Favne), 366, 374. Kra 20 til 125 Favne. 



I sin ydre Form er ogsaa denne Art stærkt varierende 

 og Forholdet imellem Spiret og Mundaabningen vexler, fra 

 Mundaabningen 8 / s af Spiret til over Spirets Længde. I 



Regelen er Vindinnrrnc sta-rkt tumide med dvli Sutur. men 

 fra Magdalenebay (Stat. 366) haves et Exemplar, der i 

 ydre Form ligner den almindelige />'. groenlandicum, og 

 Længdefoldene er kun svagt udviklet, men den eiendommelig 

 tine chagrainerede Sculptur kommer dog tydelig frem. Dr. 

 Leche omtaler derimod i sit oftere citerede Arbeide (Pag. 

 65) en Varietet med "tydelig udviklet Kjøl" og tilleier: 

 "Saavel paa Grund af denne Karakter som ogsaa ved hele 

 sin Form synes denne Varietet at danne Overgang til B. 

 undulatum, Møll." (B. Donovani?). 



Om end denne Art utvivlsomt horer til de bedste 

 Bucciuum-Arter, saa synes ogsaa her imellem at forekomme 

 Former, der tyder paa en ikke ganske ren Herkomst. 



Da nærværende Afhandhng i Januar 1881 blev ind- 

 leveret til Redaktionskomiteen, betragtede jeg den som 

 afsluttet fra min Haand, og de mange større og mindre 

 Arbeider over Buccinidæ, som senere er bleven offentlig- 

 gjort, har jeg derfor ikke kunnet tåge Hensyn til. I intet 

 væsentlig har disse dog forandret mine Anskuelser saaledes, 

 at jeg har fundet noget Omarbeide nødvendig, og lige saa 

 lidt er de af mig opstillede nye Arter, saavidt mig bekjendt, 

 beskrevet af senere Forfattere. Her skal forøvrigt oplyses, 

 at Separataftryk af Plancherne allerede i Anglist 1880 blev 

 sendt til malacologiske Venner i Europa og Amerika. 



Buccinum tenue, < i rav. 



Beechev's Vov. L839, p. L28, Pl. XXXVI, Bg. L9. 

 /.'. scalariforme (Beck) Mtøller, [nd. Moll. Groenl. 1842, p. 84. 



Habitat: Stats. 326, 357, Norway Islands (20— 30 

 laths.). 366, :i74 (20—125 laths.). 



This form varies, too. very considerably in its outer 

 characters. The proportions between the spire and the 

 aperture, for instance, vary from the aperture being two-thirds 

 to more than the length of the spire. The whorls are as a rule 

 very tumid, with a deep suture: but a specimen from Magdalena 

 Bay (Stat, 366) resembles in its habitus the normal form 

 of /.'. i/n>citl((>tdirni)i. the longitudinal folds being but slightly 

 developed, whereas the delicate granulous secondary sculp- 

 turing is distinctly perceptible. Dr. Leche mentions in his 

 aforecited work, p. 65, a variety with "a distinctly devel- 

 oped keel." -'Both by reason of this character and of its 

 general form, the said species would appear to approximate 

 B. undulatum, Moll." (B. Donovani?). 



Even in this, though unquestionably one of the best- 

 defined species of the genus, forms do, it seems, occasionally 

 occur indicating a spurious descent. 



The present Memoir having been forwarded to the 

 Editorial Committee in January 1881, I considered it as 

 finished from my pen, and to the numerous works on the 

 Buccinidæ, as well extensive as brief, that have since 

 appeared, I cannot therefore have due regard. None of 

 these, however, have affected my views to such extent, 

 that I have seen fit to re-write any portion of the Memoir ; 

 nor have the new species I have established, so far as I 

 am aware, been described by any subsequent author. For 

 the rest, I can state here, that copies of the plates were 

 distributed among malacological friends in Europe and 

 America as early as August 1880. 



Tran id into English b> John Hazeland. 



