KUNGL. SV. VICT. AKADEMIENS HANDLNGAR. BAND 48. N:0 1. 



79 



Description of the New Fopms. 



Acmcea vircjinea (Müller) var. spilzbergensis n. var. 

 ri. 1 figs. 14—1.5. 



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. Tj. 

 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 tlie 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 ohscura (Couthouy) var. multilirata n. var. 

 I'l. 5 tigs. 28—30; V\. 7 tigs. IS, 20. 



Shell depressed conical, with rounded whorls of a yellowish white colour; spiral 

 sculpture about 7 lirte, 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.h, of aperture 2.8, diameter 6.4 mm. Radula 8 . 1 . (2 . 1 . 2) . 1 . 8 ; 

 median teeth finely denticulated; the innermost lamellae bilaterally denticulated. 



This shell differs from var. finraarchica (= M. obscura Couth, of Sars, 1878) 

 in its more depressed shape, its greater number of lirse 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. 

 ]•!. 5 fig. 39; PI. 7 tig. 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 



