Rissoidae Gray 1847

44. Rissoidae indet. [Figs 16E–F] Material examined. • 1 spm, Stn. 2; • 1 spm, Stn. 10. Remarks. This slender rissoid gastropod is very similar to Subonoba turqueti (E. Lamy, 1906). It also shows the typical spiral-like surface structure. However, in the more than 300 specimens of S. turqueti found, we were never able to detect strong variability. We found one of these slender specimens in Fildes Strait and one in Ardley Cove in depths of between 60 and 70 m. These two slender specimens were listed separately here for the time being. The shell height was between 2.34 and 2.37 mm. The width was between 1.07 and 1.12 mm. The ratio of height to width was approximately 2.12 to 2.19, which is out of the range of S. turqueti given by us (see previous species) and Ponder (1983). However, if it is the same species as the previous one, it can be described as S. turqueti var. gracilis.