0 
KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:o 1. 19 
B. No keels on the whorls nor around the umbilicus; surface closely and finely 
reticulated; colour whitish with a margaritaceous lustre. H. 6.5, D. 7 mm. 
Radula as in the type var. affinis JEFFREYS 1883. 
Pl. 5 fig. 38. 
C. 2—3 prominent spiral ridges on the last whorl, the subsutural one con- 
sisting of sparse tubercles; 4—3 nodulous ridges on the convex base; aper- 
ture quadrangular; colour yellowish white, somewhat nacreous. H. 6.7, D. 
Tämm S. infundibulum (WATSON 1879). 
PEFS fo. 
Fam. Cyclostrematide. 
:BRadula 0&.1.(5.1.5).1. &; shell solid with strong transverse ribs; operculum 
calcareous Moelleria JEFFREYS 1865. 
Radula &.0.(4.1.4).0. &; shell thin, finely sculptured (or smooth); oper- 
culum corneous Cyclostrema MARRYATT 1818. 
Moelleria JEFFREYS 1865. 
Shell depressed, with longitudinal dense ribs, extending on the base to the 
umbilicus; this moderately wide, surrounded with about 4 spiral riblets ; colour white, 
grayish or brownish. H. 2, D. 2.4 mm; Wh. 3 M. costulata (MÖLLER 1842). 
0 
Pl. 5 figs. 43—47. 
Cyelostrema MARRYATT 1818. 
Delphinoidea BRown 1827. 
Surface cancellated by elevated spiral and longitudinal lines (subg. Cyclostrema 
sensu stricto). 
Shell highly depressed, sculptured by spiral lines and denser longitudinal ones; umbilicus very wide, 
without peculiar peripheric sculpture; colour transparent white. H. 0.9; D. 1.4 mm; Wh. 3 
C. areolatum G. 0. Sars 1878. 
Surface spirally striated (subg. Tubiola A. ADAMS 1864). 
A. Whole surface with microscopical, densely punctured strige; shell depressed, widely umbilicated: 
distance form apex to the insertion of outer lip (oblique spire height) about ”/1+ of the aperture 
height; colour shining white. H. 0.8, D. 1.2 mm; Wbh. 3 C. millepunctatum FRIELE 1886. 
B. Surface not punctured; usually only the base striated. 
1. Basal strie concentric with or emerging from the umbilicus. 
a. Spire low, depressed; the oblique spire height ”/s of the aperture; 
shell globose; umbilicus moderately wide; breadth of aperture > half 
the breadth of the shell; surface smooth, only the base with 8—10 
strie; colour white. H. 2.3, D. 2.5 mm; Wh. 4 
C. basistriatum (JEFFREYS M. S.) G. O. SaArRs 1878. 
Pl- 5, figs, 40:.and.£23-P1. 17.,fig. 8: 
Surface striated all over var. striolata G. O. SARs 1878. 
Surface finely and regularly striated all over; aperture more expanded than in the type 
(its height = ?/3 of the height of the shell) var. profunda FRIELE 1879. 
