26 



Nathica bathybii, Fr. 



Pl. XL Fig. 1, 2. 



Natica bathybii, Friele, „Cat. Spitsb. Moll." 1879, Pag. 272. 

 Skallen solid, livid, globos mod 5 tumide Vindinger, 

 Spiret svagt hævet og afrundet, Mundaabningen oval, 2 / 3 

 Del til :! /4 af Skallens Længde, Callo tyndt udbredt og 

 Columellen tilbagekastet saaledes, at Umilieus for største 

 Delen er dækket og der viser sig kun en dyb. men smal 

 Ombilicalsplit. Skallen er glat og blot svage og uregel- 

 mæssige Vækststriber er synlige. Af Spiralsculptur viser 

 der sig paa yngre Exemplarer nogle s.vage Spor til Stria'. 

 der dog kun er synlig i en bestemt Belysning. 



Operculum hvidt. kalkagtig, middelmaadig tykt med 

 svage, skyg'geagtige Vækststriber. 



Størrelse: 15°"" Axiallængde, 13""" Diam.. Mundaab- 

 ningen 10'" m . 



Var. oblonga. 



Tab. XI. Fig. 2. 

 Spiret mere hævet. 



Forekomst: St, 51, 240, 251, 303. 312, 353 fra 650 

 til 1333 Favne. 



Baade den typiske Form og Varieteten oblonga fore- 

 kommer imellem hinanden. 



Denne Art har stor Lighed med N. affinis, Gml. og 

 synes i Skalform at variere omtrent indenfor de samme 

 G-rændser som denne, idet Formen occlusa, 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 

 Moll. 



Tændeme ligner N. affinis. 



Velutina Schneideri, n. sp. 



Tab. XI, Fig. 3, 4. 



Skallen oval. tynd, mørkebrun; Vindingerne 2 l j-, til 3 

 hvoraf sidste udgjor den væsentligste Del af Skallen, Spiret 

 hæver sig kun ubetydelig, Mundaabningen vid oval; Sculp- 

 turen bestaar af tætte Vækststriber og svage, utydelige, 

 noget fjernede og ubetydelig hævede Spiralribber; hvor 

 Epidermis er tjernet, fremkommer et fint chagrineret Ydre 

 over Skallen, Epidermis hudagtig, brun og tæt rynket. 



Størrelse: 10""" Axial, 9""" Diam. 

 Forekomst: Tromsø 20 Favne. 



Nathica bathybii. Fr. 



Pl. XL 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 eallo 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 sculp- 

 ture appears in a few faint traces of striæ, which are, 

 however, only visible in a certain light. 



Operculum, white, calcareous, moderately thick, with 

 faint, shadowy, lines of growth. 



Size: Axial length, 15'"'". Diam., 13""". Aperture, K)""". 



Var. oblonga. 

 PI. XI, fig. 2.' 



The spiral considerably elevated. 



Habitat: Stats. Nos. 51, 240, 251, 303, 312, 353. 

 Depth, (350 to 1333 fathoms. 



Both, the typical form and the variety oblonga, occur 

 together. 



This Jspecies has a great resemblance to N. affinis, 

 Gml. and its shell-form 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 

 bathybii. 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. 



Velutina Schneideri, n. sp. 



PI XL fig. :s, 4. 



The shell oval, thin, dark-brown. ' 2 1 )-, to 3 whorls, 

 the ultimate one ot which forms the largest part of the 

 shell. The spire is only slightly elevated. The aperture 

 wide, ovate. 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. 



