Mundaabningen er omtrent halve Skallens Længde, rund 
oval, noget angulær i øvre Ende; ydre Læbe skarp; Umbi- 
licus liden, men dyb. Sculpturen bestaar af tætte, over- 
ordentlig fine Spiralstriæ; Apex er glat og nedtryt. 
Størrelse: 1.5" Axiall., 1.27” Diam. 
Forekomst: St. 853—1333  Favne. Et levende 
Exemplar. 
Hvorvidt man her har et fuldt udyiklet Individ for 
sig, eller et Ungdomsstadie, vil være vanskeligt at afgjøre. 
Samtidig med Rissoa Griegi beskrev jeg i ,Mal. Jahr- 
biieher,, 1879 Rissoa semipellucida fra samme Station. Ved 
nærmere Sammenligninger er jeg imidlertid kommen til det 
Resultat, at denne er en Dybvandsform af Rissoa turgida, 
Jeffreys og den maa saaledes udgaa som selvstændig Art. 
Odostomia sublustris, n. sp. 
Tab. XI, Fig. 11, a. 
Skallen conisk oval, hvid glindsende, Vindingerne 5 con- 
vexe, jevnt tiltagende, Suturen dyb; Apex glat, stump og 
Nucleus nedtrykt og noget tilsidebøiet; Mundaabningen oval, 
afrundet vinklet i nedre Ende; Columellen er ubetyde- 
lig bøiet og der er en svag Antydning til Fold; Umbilicus 
liden, men tydelig. Sculpturen bestaar af 16 til 18 grove 
Axialribber; lste Vinding er glat. 
Størrelse: 2.57" Axiall,, 1.27” Diam. 
Forekomst: St. 124, 192, 251 fra 350 til 649 Favne, 
Odostomia Normani, n. sp. 
Tab. XI, Fig. 12. 
Skallen aflang, noget tynd, hvid opak, glindsende; Vin- 
dingerne 4'/; svagt convexe og raskt tiltagende, sidste 
Vinding er omtrent halve Skallens Længde, Apex stump 
med nedtrykt Nucleus (ligner foregaaende Arts), Suturen 
grund; Mundaabningen piriform, tilspidset opad; Columel- 
len næsten ret med en meget svag, foldlignende Tand øverst, 
Umbilicus meget liden; Sculptur ingen; den er fuldstændig 
glat, kun enkelte Exemplarer vise Tegn til mikroscopisk 
fine Vækststriber. 
Størrelse: 27" Axjall., 17” Diam. 
deep; the aperture measures about half the length of the 
shell, subeireular, somewhat angular in the upper extremity; 
the outer lip sharp; umbilicus small, but deep. The seulp- 
ture consists of close, extremely minute, spiral striæ; apex 
smooth and flattened. 
Size. Axial length, 1.5””, Diam., 1.2". 
Habitat: Stat. No. 353. Depth 1333 fathoms. One 
living specimen. 
Whether. we have before us, here, å mature, or, only, 
an immature stage, is difficult to determine. 
Along with Rzssoa Griegi I described, in ,,Mal. 
Jahrbiicher* 1879, Rissow semipellucida, obtained at the 
same station. Upon further comparative examination I 
have, however, arrived at the opinion that the latter is a 
deep-water form of Rissoa turgida, Jeffreys, and it must 
therefore be struck out as an independent species. 
Odostomia sublustris, n. sp. 
Pl. XI, fig. 11, a. 
The shell oval, coniform, lustrous white, 5 convex, 
regularly increasing, whorls; suture deep; apex smooth, 
obtuse, with nucleus depressed and somewhat laterally 
twisted; the aperture oval, rounded angularly in the 
lower extremity; the column is only slightly curved, and 
there is a faint indication of a fold; umbilicus small, but , 
distinct. The sculpture consists of 16 to 18 coarse axial 
ribs. The first whorl is smooth. 
Size. Axial length, 2.5%", Diam., 1.2”. 
Habitat: Stats. Nos. 124, 192, 251. Depth, 350 to 
649 fathoms. 
Odostomia Normani, n. sp. 
18 SN fås 060 
Shell oblong, somewhat thin, opaque white, lustrous; 
4*/, faintly convex, and rapidly imcreasing, whorls; the 
ultimate whorl is about half of the length of the shell. 
Apex obtuse, with depressed nucleus (similar to that of 
the preceding species); suture shallow; aperture piriform, 
acuminated upwards; the column almost straight, with a 
very faint fold-like tooth at the upper extremity; umbilicus 
very small. It is perfectly smooth; only occasional spec- 
imens shew traces of, microscopically minute, lines of growth. 
Size. Axial length, 2”", Diam., 1”, 
