Cyclostrema Willei, n. sp. 
PI. XI, fig. 19. 
Skallen hvid solid, nedtrykt, Vindingerne 3, sidste 
stærkt buget, Spiret svagt hævet; Mundaabningen rund, 
Læben sammenhængende og uden nogen indvendig Fortyk- 
kelse; Umbilicus vid og dyb omtrent som hos foregaaende 
Art. Skulpturen bestaar af middelmaadig tætte Spiralstriæ 
over hele Skallen; paa den øvre Side er de dog svagere 
end paa Undersiden. 
Størrelse: 1” Axiall., 1.3" Diam. 
Forekomst: St. 173 6, 192 fra 300 til 649 Favne. 
I ydre Form ligner denne foregaaende Art, kun er 
Spiret noget mere heevet. 
Cyclostrema profundum, Fr. 
Tab. XI, Fig. 20, 
2, 22. 
C. profundum, Friele, ,,Cat. Spitzb. Moll.“ Jahrb. Mal. 
Gesell. 1879, Pag. 272. 
Skallen skjæv oval, noget solid, opac hvid, Vindin- 
gerne 4 raskt tiltagende, tumide, Spiret noget hevet, Sutu- 
ren dyb; Mundaabningen rund, Læberanden skarp og 
indenfor denne gaar en svag Fortykkelse. Sculpturen 
bestaar af tætte fine Spiralstriæ, kun Apex er glat; Umbi- 
licus dyb, men halvt dækket. 
Størrelse: 2.57" Axiall., 87” Diam. 
Forekomst: St. 192, 353, 357 fra 120 til 1333 Favne. 
» Dr. Jeffreys holder nærværende Form for en Varietet 
af C. basistriatum, Jeff, men denne Opfatning kan jeg ikke 
dele. Den ligner vistnok denne nærmest, men ved at sam- 
monholde begge Arter, vil der vise sig en ikke uvæsentlig 
Forskjel baade i Form og Seulptur. Spiret er nemlig hos 
C. basistriatum mere hævet, Mundaabningen ikke saa ud- 
videt og Sculpturen er aldrig saa regelmæssig og distinkt 
strieret over hele Skallen som hos C. profundum. 
Paa den dybeste Station 1358 forekom den temme- 
lig talrig i et Stykke Tre, der var stærkt gjennemboret af 
en Teredo. Den laa skjult dybt inde i Gangene. 
34 
Cyclostrema Willei, n. sp. 
PI. XI, fig. 19. 
Shell white, solid, compressed; 3 whorls, of which 
the ultimate one strongly tumid; the spire slightly elevated; 
the aperture circular, the lip continuous, and without any 
internal tumification; umbilicus wide, and deep, about the 
same as in the preceding species. The sculpture consists 
of moderately close spiral striæ over the entire shell; on 
the upper surface the striz are, however, more faint than 
on the lower surface. 
Size. Axial length, 1”, Diam., 1.3"”, 
Habitat: Stats. Nos. 1730, 192. Depth, 300 to 649 
fathoms. 
In Habitus it resembles the preceding species, except 
that the spire is somewhat more elevated. 
Cyclostrema profundum, Fr. 
1811 DOG treg 20 il, 22 
1 
C. profundum, Friele, ,Cat. Spitzb. Moll.“ Jahrb. 
Gesell. 1879, pag. 272. 
The shell obliquely oval, somewhat solid, opaque white; 
4 tumid, rapidly increasing, whorls; spire somewhat elevated ; 
suture deep; aperture circular; lip-edge sharp, and inside 
of it a slight tumification occurs. The sculpture consists 
of close, minute, spiral striæ, the apex alone being smooth. 
Umbilicus deep, but half covered. 
Size. Axial length, 2.57”, Diam., 37”. 
Habitat: Stats. Nos. 192, 353, 357. 
to 1333 fathoms. 
Dr. Jeffreys considers this form to be a variety of 
C. basistriatum, Jeft., but I cannot share that opinion. It, 
indeed, resembles it most, but on comparison of both 
species it will be apparent, that there is a not immate- 
rial difference both im form and sculpture. The spire is, 
for instance, in C. basistriatum more elevated, the aper- 
ture not so dilated and the sculpture is never so regular 
and distinctly striated over the whole shell as in C. pro- 
fundum. 
In the deepest locality — 1333 fathoms — it occur- 
red pretty abundantly in a piece of wood that was much 
perforated by a Teredo. It lay deeply concealed in the 
passages. 
Mal. 
Depth, 120 
