33 



Magn. long, : J 1 lot. li '. apart, long. li', diem. 



max. 6' 



Forekomst: Stat. L92 — 649 Favne. 



Der er kun fundet el større og el ganske lidet Exem- 

 plar, men begge døde. Evorvidt man her har en ny Art 

 for sig eller en Varietet af en af de bekjendte, er vanskelig 

 at sige. Dens nærmeste Slægtning maatte vel være .R Mn- 

 marchianum eller hydrophanum, idet den glatte, glindsende 

 Epidermis og koniske Form ligne paa Varieteter af disse 

 Arter, men Sculpturen er saa væsentlig afvigende, at den 

 har ingen Sammenligningspunkter. 



Dr. Jeffreys skriver til mig, at han har denne Form 

 fra •• Porcupine" Exped.. 1869 Stat. i >r> — 345 Favne, "mit 

 consider it B. groerdandicum, var. i perhaps Mnmarchianum)." 

 Det forekommer mig dog at være en Støtte for Formens 

 Artsberettigelse, at den optræder uforandret paa saa for- 

 skjellige Punkter. 



Buccinum Terræ Novæ. Beck. 



Tab. III, Fin-. 13—16. 



Tritoniwm Terræ Novæ (Beck) Mørch. Gat. Moll. Spitzb. 



Pag. 14. 

 Buccinum Donovani, Reeve. Conch, icon. Fig. 2. 

 B. undatum, var. clathratum, S. Wood. Supp. to the 



Crag. Moll. Pag. 18. Tab. II. Fig. 3 a, b. 

 B. Terræ Novæ, Leche. 1. c. Pag. 61, Tab. II. Fig. 33. 

 B. Toften?. Friele. Cat. cl. Spitzb. Moll. Fag. 278. 



Forekomst: Stat. 366 og 37-4. Fra 20 til 60 Favne. 



I min -'Catalog d. Spitzb. Moll." har jeg opført denne 

 Form under Stimpson's B. Totteni. Jeg er vistnok ikke 

 bleven overbevist om. at dette er feilagtig, men eiter at 

 have seet en Del mere af den nordamerikanske Form, er 

 jeg bleven tvivlende om det er praktisk heldigt at slaa disse 

 to sammen. At de kan gaa over i hinanden, derom har 

 jeg overbevist mig. men saa tindes der ogsaa Overgange til 

 groenlandicum, og skal man være streng i Artsbegrebet inden 

 denne Slægt, bliver der ikke mange Arter tilbage. 



Neppe nogenArt er saa stærkt varierende som denne, 

 hvad man ogsaa kan domme efter de 3 afbildede Exempl. 

 Fig. 13, 14 og 15. der alle er tåget paa samme Lokalitet, 

 nemlig Adventbay (Spitsbergen). 



Som Regel har den grove Spiralribber og imellem 

 disse ligge talrige finere; hos alle mine Exemplarer tindes 

 der Længdefolde paa Tophvirvlerne, der igjen forsvinde paa 

 Hovedvindingen. Den secundære Striering bestaar af yderst 

 fine, meget tætte Spiralstriæ, der er svagt bølgende eller 

 næsten chagraineret, fremkommen ved at krydses af talrige 

 fine Væxtlinier. Denne mikroskopiske Sculptor hndes ogsaa 



Den norske Nordhavsespedition. Herman Friele: Mollusea. I. 



Magn. long. 27 am , lat. 1 i ■•• ■■'. wpert. long, li diam. 



max. 6 l / a mm . 



Eabital : Station 192, in 649 fathoms. 



( )nl\ two specimens were obtained, one a compara- 

 tively large and the other a very small individual, and both 

 dead. Whether this form represent a, new species, or merely 

 a variety of one of those already known, is difficult to de- 

 cide. It resembles some varieties of B. Finmarchianum or 

 hydrophanum in the conical form and smooth, glistening 

 epidermis; but the sculpture is wholly different, with not a 

 single approximating feature. 



Dr. Jeffreys writes me, that he has B. sulcatum 

 from the "Porcupine" Expedition, 1869, Station 65, .at 

 345 fathoms, "but regards it as II. groenlandicum, var. (pos- 

 sibly B. F/iniKinlnttiiinii)." The occurrence in so different 

 localities seems to me to be a proof in favour of the spe- 

 cific distinctness of this form. 



Buccinum Terræ Novæ, Beck. 



Pl. III. tigs. 13—16. 



Tritoniwm Terræ Novæ (Bech) Morch. Cat. Moll. Spitzb., 



p. 14. 

 Buccinum Donovani, Reeve. Conch, icon., fig. 2. 

 B. undatum, var. clathrabwm, S. Wood. Supp. to the 



Crag. Moll., p. 18, Pl. H, fig. 3 a, b. 

 B. Terræ Novæ, Leche, 1. c, p. 61, Pl. II, fig. 33. 

 B. Totteni, Friele. Cat. d. Spitzb. Moll., p. 278. 



Habitat : — Stats. 366, 374 ; from 20 to 60 fathoms. 



In my -'Catalog d. Spitzb. Moll.," this form is refer- 

 red to Stimpson's B. Totteni, and I am not as yet convin- 

 ced that in so doing I was mistaken; but having since seen 

 a good many more North American specimens. I think it 

 most practical to leave these two forms, B. Terræ Novæ and 

 B. Totteni, specifically separated. That they do sometimes 

 merge into each other, I have satisfied myself; but there 

 are also transition-forms to groenlandicum; and if a searching 

 criticism be applied to the species of this genus, few would 

 indeed be left. 



There is not. perhaps, another species of the genus 

 that varies to such an extent, as a glance at the 3 speci- 

 mens represented in tigs. 13. 14. and 15 — all of them 

 from the same locality (Advent Bay. Spitzbergen) — will 

 suffice to show. 



As a rule, the shell is sculptured with coarse spiral 

 ribs, or carina, between which are numerous tiner ours. 

 All of my specimens have the top whorls with longitudinal 

 folds, which disappear on the body-whorl. The secondary 

 striation consists of exceedingly delicate, closely disposed 

 spiral stria', which, being intersected by numbers of delicate 

 lines of growth, give an almost shagreened appearance to 



