KUNGL. SV. VET. AKADEMIENS HANDLNGAR. BAND 48. N:o 1. 79 
Description of the New Forms. 
Acmeea virginea (MÖLLER) var. spitzbergensis n. var. 
Pl. 1 figs. 14—15. 
Shell elliptic, solid, rather high, of a uniform cream colour without any traces 
of red stripes, sculptured with distinct radiating threads and concentric lines of 
growth. Pallial scar with a deep circular lateral sinus behind the head region. L. 
10.9; Br. 8.2; h. 3.9; apex perpendicularly from anterior margin 2 mm. 
This variety is distinguishable from the type by its distinct radiating sculpture 
and its uniform colour. The size falls within the limits of variation of the species, 
and it may be considered as a geographical variety confined to the north coast of 
Spitzbergen (cfr pag. 26). Only 2 dead shells of this form have been obtained. 
Solariella obscura (CouTHOUY) var. multilirata n. var. 
P1 5Ig0sT28—30; PI. 7 figs. 18; 20. 
Shell depressed conical, with rounded wbhorls of a yellowish white colour; spiral 
sculpture about 7 lirXe, prominent and weak ones alternately, on the last whorl, base 
striated, coarser around the umbilicus, but without keels; longitudinal sculpture in- 
distinct, present in very faint traces only on the uppermost whorls; umbilicus large. 
Height of shell 4.3, of aperture 2.8, diameter 6.4 mm. Radula 8.1.(2.1.2).1.8; 
median teeth finely denticulated; the innermost lamell& bilaterally denticulated. 
This shell differs from var. finmarchica (=M. obscura Couth. of Sars, 1878) 
in its more depressed shape, its greater number of lire and in the absence of 
distinct longitudinal sculpture. The two forms are nearly allied and connected by 
transition stages (cfr pag. 70—73). 
Cyclostrema turgidum n. sp. 
Pl. 5 fig. 39; Pl. 7 fig. 7. 
Shell depressed conical, with 4 tumid whorls and deep suture, white, covered 
with a light yellowish-green cuticula; spire elevated, aperture circular with simple 
