32 



Fra Stat. 366 (Magdalenebay) haves 2 Exemplarer. 

 der er afvigende paa en høist eiendommelig Maade. Oper- 

 culum er hos hydrophanum rundt, lidet og dets Gjennem- 

 snit i Regelen mindre, men aldrig større end halve Mund- 

 aabningens; Nucleus er central eller ubetydelig til Siden. 

 Hos hine to er derimod Operculum paafaldende storre end 

 det normale, og for det ene Exemplars Vedkommende ei- 

 det et ægte B. groenlandicum Operculum. Et af Exempla- 

 rerne har en Kjol rundt sidste Vinding noget nedenfor 

 Periferien. 



Ægfotpxlcrne iFig-. 2:>) ere enten enkelte eller nogle 

 faa sammenvoxne. Overdåden er fint punkteret og ligner 

 nærmest Appelsinens Ydre. 



Tænderne ligne B. groenlandicwms. 



Buccinum nivale. n. sp. 



Tab. III. Pig. 24. 25 „. h. 



Testa orata. tenuis, nivea, anfradibus 5 (?) tumidis, 

 ultimo magno et rentricoso. apertura magna, orata. epider- 

 mide laevi. Superficies uMque striis spiralibus densis tenui- 

 bus striisque incrernenti numerosis, irregularibus seulpta, oper- 

 culo parvo, oral/, nucleo subterminali. 



Magn. long. 11""". lat. 9 mm . 



Station 164 — 457 Favne. 



Der er kun fundet et ungt, men levende Exemplar af 

 denne Form. Skallen adskiller sig ikke i noget væsentlig 

 fra B. hydrophanum, naar undtages den snehvide Farve, 

 og maaske er det kun en Varietet af denne. Men hoist 

 eiendommelig er Operculum (Fig. 2."> ... b); det er ovalt, 

 har Nucleus henimod nedre Ende, Undersiden ( Fis. -i:> b\ 

 har en bred, noget fortykket Rand og Væxtlinierne er kun 

 synlig igjennem Midtpartiet. 



Tænderne give som sædvanlig ingen Oplysninger; de 

 ligne B. groenlandicwms. 



Buccinum sulcatum, n. sp. 



Tnh. III. Fig. IS. 



Testa temas, nitida, riolacea, conica, anfradibus 6 

 planis, aequaliter crescentibus, sn/ura minn* conspicua, aper- 

 tura orata, utrinque acuminata, dimidiam fere testae longir 

 tudinem aequante, columella reda, plicis 2 leviter impressis'. 

 Sttperficies costis spiral/has crassis, in anfradu penultimo 4, 

 una vel in superiore anfradus parte plurib&s tenuioribus 

 interposiiis, striisque incrernenti densis, sed obsohtis seulpta, 

 epiåermide laevi. 



From Stat. 366 there are 2 specimens differing re- 

 markably from the typical form. The operculum in hydro- 

 phanum is round and small, with a diameter as a rule less, 

 never greater, than half the length of the opening of the 

 mouth, the nucleus being central, or nearly so. In the two 

 aforesaid specimens, the operculum is. on the other hand, 

 very considerably larger than that of the normal form. nay. 

 in one of them, it cannot be distinguished from the oper- 

 culum in B. groenlandicum. The other specimen is keeled 

 round the last whorl, a little below the peripheral line. 



The egg-capstiles (fig. ■_':;, cither simple or a few only 

 grown together. Surface delicately punctured, causing it to 

 resemble the rind of an orange. 



Dentition as in B. groenlandicum. 



Buccinum nivale, n. sp. 



PI. III. figs. 24. 25 ». /-. 



Testa orata. tenuis nivea, anfradibus ~> (?) tumidis, 

 ultimo magno d rcufr/<-<>st>. apertura magna, orata, epider- 

 mide laevi. Superficies ubique striis spiralibus densis tenui- 

 bus striisque incrernenti numerosis, irregularibus seulpta, oper- 

 calo parvo ovali, nucleo subterminali. 



Magn. long. 11""". lat. 9 mm . 



Habitat: — Station 164. in 4o7 fathoms. 



Only one specimen, young but living, was obtained. 

 The shell does not exhibit any material difference from that 

 in B. hydrophanum, of which B. nivale is perhaps a mere 

 variety. But the operculum (fig. 2'. ... 5) has very peculiar 

 features; it is oval in form, with the nucleus near the lower 

 extremity, the under surface (fig. 25 '>< furnished with a 

 broad, somewhat inspissated margin, and the lines of growth 

 visible through the medial portion only. 



Nothing, as usual, to be learnt from the structure of 

 the teeth, which is similar to that in B. groenlandicum. 



Buccinum sulcatum, n. sp. 



Pl. III. fis. 18. 



Testa tenuis, nitida, riolacea, conica, anfradibus 6 

 planis, aequaliter crescentibus, sntnra minus conspicua, aper- 

 tura orata, utrinque acuminata, dimidiam fere testae longi- 

 tudinem aequante, columella reda, plicis 2 leviter impressis. 

 Superficies costis spiralibus crassis, in anfradu penultimo 4, 

 una vel in superiore anfradus parte pluribus tenuioribus 

 interpositis, striisque incrernenti densis, sed obsoletis seulpta, 

 epidermide laevi. 



