109 
Cylichna discus, Watson. 
Cylichna discus, Watson, Journ, Linn. Soc. London, vol. 17, 1883, p. 319. 
Findested. Stationerne 18, 31, 51, 87, 192, 200, 
240 og 295. Dybde 412—1163 fy. 
Paa de største havdyb forekom cylichna discus ret 
hyppig. Den er af ,,Challenger“expeditionen taget ved 
Culebra Island, Vestindien, 390 fy., og efter meddelelse 
fra Jeffreys, der i sin tid havde exemplarer fra den norske 
expedition til sammenligning, fandtes den af ,,Porcu- 
pine“expeditionen udenfor den spanske og portugisiske kyst, 
304—994 fy. 
De fleste exemplarer fra de større dyb havde spiret 
noget eroderet, saaat flere vindinger var synlige. - Hos ube- 
skadigede exemplarer saaes derimod blot en fordybning. 
Fra cylichna alba afviger denne art blot ved sin forholds- 
vis slankere mere cylindriske form. Dog maa bemærkes 
at exemplarerne fra de mindre dyb saasom station 18, 31 
og 87 nermede sig sterkt til cylichna alba. 
| 
Watson, Rep. Sci. Res. Challenger Exp. Zool., vol. 15, 1886, p 664, Pl. 49, fig. 19. 
Locality. Stations 18, 31, 51, 87, 192, 200, 240, 
and 295. Depth 412—1163 fathoms. 
C. discus occurred frequently at great depths. It 
was found by the ‘Challenger’ near Culebra I. in the West 
Indies (890 fathoms); and according to Jeffreys, who had 
had specimens from the Norw. Exped. for comparison, it 
was found by the ‘Porcupine’ off the Spanish and Portu- 
guese coast (304—994 fathoms). 
The spire in most of the specimens from the greatest 
depths was somewhat eroded, so that several whorls were 
visible. In uninjured specimens, on the other hand, only 
a depression was to be seen. ‘This species differs from 
C. alba in its comparatively slenderer, and more cylindrical 
form. It must be remarked, however, that the specimens 
from smaller depths, such as at Stations 18, 31, and 87, 
bore a strong resemblance to C. alba. 
Cylichna insculpta, Totten. 
Bulla tnsculpta, Totten, Sillimans Jour. of Sei., vol. 28, 1835, p. 350, fig. 4. 
Gould, Rep. Invert. Mass., 1841, p. 162, fig. 92. 
Cylichna reinhardti, Mørch, Rink, Dan. Greenland, 1877, p. 436. 
Findested. Jan Mayen, 10—20 fy., Magdalena Bay, 
40—60 fy. og station 366. 
| 
solitaria, Friele, Nyt Mag. for Naturvidensk., vol. 24, 1878, p. 5. 
remhardti, Leche, Kgl. Sv. Vet. Akad. Handl., vol. 16, no. 2, 1878, p. 73, Pl. 1, fig. 21. 
occulta, Friele, Jahrb. Deutsh. Mal, Gesell., vol. 6, 1879, p. 283. 
Locality. Jan Mayen (10—20 fathoms), Magdalena 
Bay (40—60 fathoms), and Station 366. 
Cylichna striata, Brown. 
Bulla striata, Brown, Ill. Conch., 1827, Pl. 38, fig. 41 & 42. 
Cylichna propinqua, M. Sars, Christiania Vidensk. Selsk. Forhandl., 1858, p. 49. 
G. O. Sars, Moll. Reg. Arct. Norv., 1878, p. 284, Pl 18, fig. 5, Pl. XI, fig. 5. 
scalpta, Leche, Kgl. Sv. Vet. Akad. Handl., vol. 16, no. 2, 1878, p. 73, Pl. 1, fig. 22. 
—: reinhardti, Aurivillius, Vega Exp. Vet. Iakt., vol. 4, 1885, p. 370. 
Findested. Stationerne 223, 224, 260, Tromsø og 
Alten, 20 fr. Dybde 20—127 fy. 
Cylichnaformerne: insculpta, solitaria, occulta, sein- 
hardti og scalpta bør visselig reduceres til to distincte 
arter, cylichna msculpta, Totten, og cylichna striata, Brown. 
Vor opfatning af disse to arter tror vi klart nok vil frem- 
gaa af ovenstaaende synonymilister. 
Til sammenligning med vort materiale fra Nordhays- 
expeditionen har vi fra Mørch havt cylichna tnsculpta fra 
Grønland, fra Dall c. solitaria fra N. Carolina, fra Krause 
c. striata fra Beringshavet og fra professor Sars c. pro- . || 
Loeality. Stations 223, 224, and 260, Tromsø, and 
Alten (20 fathoms). Depth 20—127 fathoms. 
The Cylichna forms, insculpta, solitaria, occulta, rein- 
hardti, and scalpta, ought certainly to be reduced to 2 
distinct species, C. nsculpta, Totten, and C. striata, Brown. 
Our view of these species will, we think, be sufficiently 
intelligible from the above list of synonyms. 
For the purpose of comparison with our specimens 
from the N. Atlantic Expedition, Mørch sent us C. in- 
sculpta from Greenland, Dall C. solitaria from N. Carolina, 
Krause GC. striata from the Bermg Sea, and Prof. Sars 
