Nathica bathybii, Fr. 
Pl. XI, Fig. 1, 2. 
1 
Natica bathybii, Friele, ,,Cat. Spitsb. Moll.“ 1879, Pag. 272. 
Skallen solid, hvid, globos med 5 tumide Vindinger, 
Spiret svagt hævet og afrundet, Mundaabningen oval, 2/5 
Del til % af Skallens Længde, Callo tyndt udbredt og 
Columellen tilbagekastet saaledes, at Umilicus for største 
Delen er dækket og der viser sig kun en dyb, men smal 
Umbiliealsplit. Skallen er glat og blot svage og uregel- 
mæssige Vækststriber er synlige. Af Spiralsculptur viser 
der sig paa yngre Exemplarer nogle svage Spor til Striæ, 
der dog kun er synlig i en bestemt Belysning. 
Operculum hvidt, kalkagtig, middelmaadig tykt med 
svage, skyggeagtige Vækststriber. 
Størrelse: 15”” Axiallengde, 18”” Diam., Mundaab- 
ningen 107”, 
Var. oblonga. 
Tab. XI, Fig. 2. 
Spiret mere heevet. 
Forekomst: 
til 1883 Favne. 
Baade den typiske Form og Varieteten oblonga fore- 
kommer imellem hinanden. 
Denne Art har stor Lighed med WN. affinis, Gml. og 
synes i Skalform at variere omtrent indenfor de samme 
Grændser som denne, idet Formen occluwsa,; Wood, er en 
tilsvarende Varietet af affinis som oblonga af bathybii. 
Fra N. affinis vil dog vor Art let adskille sig ved den 
tydelige Navlesplit, der ligner den hos Lunatia groenlandica 
Møll. 
St. 51, 240, 251, 303, 312, 353 fra 650 
Tænderne ligner N. affinis. 
Velutina Schneideri, n. sp. 
Tab. XI, Fig. 3, 4. 
Skallen oval, tynd, mørkebrun; Vindingerne 21/4 til 3 
hvoraf sidste udgjør den væsentligste Del af Skallen, Spiret 
hæver sig kun ubetydelig, Mundaabningen vid oval; Seulp- 
turen bestaar af tætte Vækststriber og svage, utydelige, 
noget fjernede og ubetydelig hævede Spiralribber; hvor 
Epidermis er fjernet, fremkommer et fint chagrineret Ydre 
over Skallen, Epidermis hudagtig, brun og tæt rynket. 
Lov” Axial, 97 Diam. 
Tromsø 20 Fayne. 
Størrelse: 
Forekomst: 
‘Nathica bathybii, Fr. 
PI. XI, figs. 1, 2. 
Natica bathybii, Friele, Cat. Spitzb. Moll. 1879, pag. 272. 
The shell solid, white, globular, with 5 tumid whorls; 
the spire slightly elevated, and rounded; the aperture oval, 
measuring two-thirds to three-fourths of the length of the 
shell; the calle thinly spread out, and the column doubled 
back so that the umbilicus is, for the most part, covered, 
and there appears only a deep, but narrow, umbilical split. 
The shell is smooth, and only faint irregular lines of 
growth are visible. In young specimens. the spiral seulp- 
ture appears in a few faint traces of striæ, which are, 
however, only visible in a certain light. 
Operculum, white, caleareous, moderately thick, with 
faint, shadowy, lines of growth. 
Size: Axial length, 15””. Diam., 13". Aperture, 10”, 
Var. oblonga. 
Je NUL sie, 2 
The spiral considerably elevated. 
Habitat: Stats. Nos. 51, 
Depth, 650 to 1333 fathoms. | 
Both, the typical form and the variety oblonga, occur 
together. 
This {species has a great resemblance to N. affinis, 
Gml. and its shellform appears to differ, within about 
similar limits to that, because the form occlusa, Wood, 
is a corresponding variety of affinis, just as oblonga is of 
bathybu. Our species is, however, distinguishable from N. 
affinis by its distinct. umbilical split, which resembles that 
of Lunatia groenlandica, Moll. 
The teeth resemble those of N. affinis. 
240, 251, 303, 312, 353. 
Velutina Schneideri, n. sp. 
Pl XT, fe 3, 4 
The shell oval, thin, dark-brown. 21/2 to 3 whorls, 
the ultimate one of which forms the largest part of the 
shell. The spire is only slightly elevated. 
wide, ovate. 
The aperture 
The sculpture consists of close-set lines of 
growth, and of faint, indistinct, somewhat separated, and only 
slightly elevated, spiral ribs; where the epidermis is removed, 
a fine shagreen-like exterior appears on the shell: the 
epidermis coriaceous, brown, and closely puckered. 
Size: Axial length, 10"". Diameter, 9””. 
Habitat: Tromso. Depth, 20 fathoms. 
