Chrysallida brattstroemi: The shell is very small and cylindrical, blunt, and colourless, with strong, orthocline axial ribs and three weaker spiral ribs. The larval shell is somewhat depressed, consists of slightly less than one visible whorl, is perfectly smooth and has a diameter of 0.32 mm. The teleoconch consists of about 2.3 rather flat whorls of slowly increasing diameter, with a main sculpture of about 20 strong, rounded, slightly flexuous, orthocline ribs per whorl and irregular and much finer incremental lines. The spiral sculpture consists of three ribs, which do not cross the axial ribs, and which are placed so that the lowermost one is concealed by the suture. The axial ribs continue basally to the lower spiral rib and enter, although then much weaker, the umbilicus. The suture is deep and channelled. The aperture is large, ovate, and slightly expanded in the lower part. The parietal callus is well developed. There is no columellar fold. The umbilicus is fairly wide. Height of the holotype 1.15 mm.

Chrysallida brattstroemi: Chrysallida brattstroemi could easily be mistaken as a young specimen of some other species of Chrysallida, and the specimens examined are probably not adult, but the short, blunt, cylindrical shape with convex whorls, is more pronounced than in any other species. It has also been found sympatrically with C. eximia on two occasions and than constantly showing the more depressed protoconch and flat whorls. The shape is similar to that of Parthenina flexuosa (Jeffreys MS. Monterosato. 1874), a more southern deepwater species which has a distinct subsutural notch, giving the ribs a strong subsutural curvature. Chrysallida brattstroemi also differs from C. eximia and C. hoeisaeteri in having proportionally lower whorls, about 2.3 times as broad as high, in the others about 2-2.1 times.

Hoisaeter: This species seems to have a more southern distribution than C. eximia (not known south of western Scotland), C. hoeisaeteri and C. bjoernssoni. These also have a narrower and longer shell. I provisionally place it in a group together with these species, although the relationship might be to some more southern, deep water species, e.g. C. stefanisi (Jeffreys, 1869).

Chrysallida brattstroemi: Type locality: Skagerrak, 58°54*N, 10°33'E, 200-220 m, mud with arenaceous foraminifera.
This species was described from 21 specimens from a sample taken just south of Faerder in the Skagerrak (58°54'N, 10°33'E, 200-220 m). Waren reported in addition five specimens from the shelf outside Korsfjorden (60°08'N, 250 to 380 m) and a single shell from Trondheimsfjorden. In my material 13 specimens and 16 shells. Three shells from Tomfjorden (66°12'N, 380-300 m, mixed bottom), one specimen and one shell from outer part of Bindalsfjorden, (65012'N, 12°10'E, 510-460 m, soft bottom), and four samples from Risvaer-fjorden (65°N, 11°29'E, 100-200 m, shells only). Finally 12 well preserved specimens from the shelf outside Korsfjorden (60°07.5'N, 4°51'E, 317-315 m, silty sand with lots of foraminiferans; coll. and leg. A. Waren). Outside Norway known from the Italian Lower Pleistocene and as Recent from the western Mediterranean (Waren 1991, Micali et al. 1993, Penas et al. 1996).