Calcareous foraminifera from the Ordovician of Baltoscandia

Ordovician erratic boulders from northern Germany have yielded uniserial calcareous foraminifers which were previously unknown from the Baltoscandian Ordovician. They represent at least two new species which are provisionally placed in the genus Saccamminopsis Sollas, 1921.

. Ordovician forms from the Girvan area of Scotland recorded by various authors are listed by Cummings (1952, p. 225) as Saccamminopsis cf. fusufinaformis. This is the oldest occurrence of foraminifera in Britain (Murray, 1981, p. 13). The Silurian specimens from the basal Wenlock Woolhope Limestone of Wych, Malvern in the Welsh Borderlands (Brady, 1888), are considered by Cummings (1952, p. 225) to be identical "with either Ordovician o r Carboniferous examples of Saccamminopsis". The taxonomic position of the Ordovician specimens described by Bykova cannot be ascertained on the basis of the published figures.

SYSTEMATIC DESCRIPTIONS
S . fusulinaformis sensu Cummings, 1952 from the Ordovician is the same size (1.6 mm, range: 1 .3 -1 .7 mm) but cannot be compared with S. ? syltensis because of the lack of plates or figures.

PI. I ,
(PI. 2, figs. 1 , 2 (? figs. 3, S), Table 2) Derivation of name. From the type locality. Diagnosis. Length of holotype (4 chambers, first chambers missing) 2.42 mm. Chambers becoming longer in oral direction and wider with nearly constant length: width ratio (mean I .4). Chambers egg-shaped with blunt end up or elliptical; neck of chambers only short and relatively broad (%-" 1 5 of the greatest width of chamber). Holotype with a broad round aperture at the top of the final chamber (width about l/4 of the width of the chamber).  (Schallreuter, 1970 : 65). Table 2.

Dimensions. See
Remarks. The specimen from boulder 1B 10 (PI. 2. fig. 2) exhibits no broad aperture at the end of the final chamber, only a fine perforation; at the other (broken) end the test is open to full width. In one specimen with two chambers ( G P I M H 2573) the upper chamber shows (besides the normal neck) a short second neck-like projection with a broken end indicating bifurcation similar to that in the specimen of S. carteri figured by Brady (1871, pl. 11, fig. 2, right;right;Loeblich & Tappan, 1964, fig. 232.1, 31d chain from left).
Some of the smaller specimens from boulder 14B2 are distinguished from the typical specimen by having more slender chambers and broader necks between the chambers (PI. 2, fig. 3) The length of the chamber varies between 0.21 and 0.35 mm and is not very different between chambers of a row (2 or 3); the length: width ratio varies between 1.53 and 2.56. It is at present hard to say whether they represent more juvenile parts of rows or whether they belong to another species; they are therefore referred to here as S. ? sp. cf. teschenhagensis.
Saccamminopsis carteri is much larger. The chambers of a row are all of about the same size (hence the questionable generic assignment of the new species) and the necks between the chambers are very thin (Brady, 1871, pl. X11, fig. 2;Loeblich & Tappan, 1964, fig. 232.1).  (Schallreuter, 1970;1973;p. 65