34 



Cyclostrema Willei, n: sp. 



PI. XI, fig. 19. 



Skallen livid solid, nedtrykt, Vindingerne 3, sidste 

 stærkt buget, Spiret svagt hævet; Mundaabningen rund, 

 Læben sammenhængende og aden nogen indvendig Fortyk- 

 kelse; Umbilicus vid og dyb omtrent som hos foregaaende 

 Art. Skulpturen bestaar af middelmaadig tætte Spiralstriæ 

 iiver hele Skallen; paa den ovre Side er de dog svagere 

 end paa Undersiden. 



Størrelse: 1""" Axiall., 1.3' Diam. 



Forekomst: St, 1 7-S b, 192 fra 300 til 649 Favne. 



I ydre Form ligner denne foregaaende Art, kun er 

 Spiret noget mere hævet. 



Cyclostrema profundum, Fr. 



Tab. XI, Fig. 20, 21, 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 hævet, 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. 



Sftnreke: 2. 



Axiall., 8""" 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- 

 manholde begge Arter, vil der vise sig en ikke uvæsentlig 

 Forskjel baade i Form og Sculptur. Spiret er nemlig hos 

 C. basistriatum mere hrevet, Mundaabningen ikke saa ud- 

 videt og Sculpturen er aldrig saa regelmæssig og distinkt 

 strieret over hele Skallen som hos C', profundum. 



Paa den dyheste Station 1333 forekom den temme- 

 lig talrig i et Stykke Træ, der var stærkt gjennemboret af 

 en Teredo. Den laa skjult dvbt inde i Gangene. 



Cyclostrema Willei, n. sp. 



Pl. 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 striæ are, however, more faint than 

 on the lower surface. 



Size. Axial length, 1""", Diam., 1.:!""". 



Habitat: Stats. Nos. 173 6, 192. Depth, 300 to 649 

 fathoms. 



In Habitus it resembles the preceding species, except 

 that the spire is somewhat more elevated. 



Cyclostrema profundum, Fr. 



PI. XI, figs. 20, 21, 22. 



C. profundum, Friele, „Oat. Spitzb. Moll. - ' Jahrb. Mai. 



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. 2.5""", Diam.. 3""". 



Habitat: Stats. Nos. 192, 353, 357. Depth. 120 

 to 1333 fathoms. 



Dr. Jeffreys considers this form to be a variety of 

 C. basistriatum, Jeff., 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 in form and sculpture. The spire is, 

 for instance, in C. basistriatum more elevated, the aper- 

 ture not so dilated and tin/ 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 

 parages. 



