gere end bred og de 3 Tænder paa Skjæreranden staa tæt 
sammenstillede med Midttanden længst; Sidepladerne ligne N. 
islandicas. Fig. 14 holder jeg for at være Artens Normal- 
form, men af 6 undersøgte Exemplarer viser kun 2 denne, 
de øvrige 4 har Uregelmæssigheder snart i Sidepladernes, 
snart i Centralpladens Bygning. Et Exemplar (Fig. 16) 
viser hvor nær Overgangen er til Mohnias Tandform, idet 
Centralpladens Tænder forener sig til en forlænget Spids og 
Sidepladens Midttand voxer sammen med den indre ‘and. 
Rækkernes Antal varierer fra 90 til noget over 100. 
Neptunea (Sipho) gracilis, dCost. 
Tab. I, Fig. 19, a, 6, ¢. 
Buccinum gracilis, da Cost. Br. Conch. Pg. 124. 
Sipho glaber, Verkr. Jahrb. Mal. Gesell. 1876, Pg. 174, 
Tab. 3. 
Forekomst: St. 
20 til 341 Favne. 
Formen Sipho glaber Verkruzen afviger i Grunden 
saa lidet fra gracilis at der neppe er noget andet end den 
brungrønne Epidermis, der skulde berettige nogen Adskil- 
lelse. Hvad Sculptur angaar, da ser jeg ingen Forskjel 
imellem Explr. her fra Bergen og fra Finmarken, 
9, 23, Bodø (20 F.), 255 og 261 fra 
Apex (Fig. 19 a, 5, c) er som Regel let at adskille 
fra N. islandica, men om end denne Karakter hører til de 
mest paalidelige til Bedømmelse af Arterne, saa er den dog 
ikke, ligesaalidt som nogen anden Karakter, absolut konstant. 
Fig. 19 c viser en stor Tilpærmelse til N. islandica 
og der kan 1 det Hele taget forekomme Exemplarer, over- 
for hvilke man vil staa meget tvivlsomme. Fra St. 261 
(Tanafjord) haves saaledes et Exemplar, som paa Grund 
af den slanke Form og noget skarpere Sculptur end hos 
graeilis, er bestemt for zslandica, men Apex hører dog 
nærmere den første til. Dette er vistnok et sjeldent Til- 
fælde, og det eneste, der er forekommet mig. 
Tænderne er ikke at adskille fra N. islandica. 
12 
than broad, and having closely disposed the 3 cusps. 
of which the median is the longest; the laterals res- 
emble those in N. islandica. Fig. 14 represents, as I 
conceive, the normal character of the dentition in this 
species, though of 6 specimens examined only 2 were 
found to share it, the other 4 exhibiting divers irregular- 
ities, now in the structure of the laterals, now in that of 
the central plate. One example (fig. 17) shows how closely 
the dentition approximates that in Mohnia, the 3 cusps on 
the central plate uniting into a single elongated point, and 
the median cusp of the laterals growing together with the 
inner one. 
Number of rows from 90 to upwards of 100. 
Neptunea (Sipho) gracilis, d’Cost. 
Pl. I, fig, 19, a, 5 6. 
Buccinum gracilis, da Cost. Br. Conch, p. 124. 
Stpho glaber, Verkr. Jahrb. Mal. Gesell. 1876, p. 174, 
Ils Bp, 
Habitat: — Stats. 9, 23, Bodø (20 f.), 255, and 261; 
from 20 to 341 fathoms. 
The difference between the form Sipho glaber and 
B. gracilis is so trifling, that the brownish-green epidermis 
constitutes about the only feature on which to found a di- 
stinction. As regards the sculpture, I cannot detect the 
slightest diversity on comparing specimens from Bergen 
with others collected on the coast of Finmark. 
The apex (fig. 19 a, 5, c) May as a rule be readily 
distinguished from that in N. islandica; but, though one of 
the safest of specific characters, it does not prove more 
absolutely constant than any other character. 
Fig. 19 ¢ represents a close approximation to N. 7s- 
landica; indeed, examples of gracilis can give rise to con- 
siderable doubt. Thus, for instance, a specimen was taken 
at Station 261 (Tanafjord), which, owing to its slender 
form and a stronger, more distinct sculpturing than in gracilis, 
has been referred to islandica, although the apex presents 
greater resemblance to that in the former species. Mean- 
while, this is a rare case, nay the only one I have met with. 
The dentition is not to be distinguished from that 
in N. zslandica. 
