13 
JU 
UR 
KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:o 1. 15 
B. Radula with fewer (5—30) lamell&e with falciform apex; lateral tooth of 
the same form as the median ones or the first lamellzx, well developed ; shell 
often with net-like or granular sculpture :Solariella SEARLES Woop 1842 
(= Macheroplax FRIELE 1877). 
Gibbula Risso 1826. 
Whorls flattened, not inflated nor nodulous below the suture. 
A. Shell often pyramidal, narrowly umbilicated with close-set grayish to 
brownish radiating stripes, often broken into dots, intervals as narrow as 
the stripes; these extending mostly to the umbilicus; sculpture formed by 
fine spiral thread-like ridges, of which 11—14 on the base, of uniform 
strength. H. 12—20 mm G. cineraria (LINNÉ 1758). 
Pl. 3 figs. 4—7. 
B. Shell depressed, conical but never pyramidal, narrowly umbilicated, with sparse reddish stripes (inter- 
vals broader than these), extending to the umbilicus, never broken into dots; sculpture formed by 
coarser ridges, of which 6—938 stronger and a few finer on the base; body-whorl with a broad 
flattened nearly smooth peripheric angular ridge. «H. 17, D. 20 mm (England) 
G. obliquata (GMELIN 1783) 
(= Trochus umbilicatus Montacu 1803). 
Wbhorls inflated in their upper part and truncated at the suture. 
A. Shell conic, narrowly umbilicated; whorls not nodulous; colour yellowish or 
greenish with a brilliant lustre; longitudinal stripes of brown sparse, wavy 
or zigzag, usually broken up in dots on the base, disappearing toward the 
umbilicus. H. 10—14 mm G. tumida (MoNntAGU 1803). 
Pl. 3 figs. 8—15. 
B. Shell depressed, widely umbilicated; whorls nodulous at the suture; colour 
yellowish without lustre, variegated by brown dots or irregular and abrupted 
stripes. H. 11-—20 mm (England) G. magus (LINNÉ 1758). 
BIN fika 
Calliostoma SWwAINSON 1840. 
Zizyphinus GRAY 1840. 
Radula as in Gibbula (rhachian tooth with broad basal plate); shell granulated 
by crossing spiral riblets and longitudinal lamell&e; colour variegated with light 
yellowish and darker red or brownish spots or stripes. H. 12—18 mm 
C. miliare (BrRoccHIi 1814) 
(= Trochus millegranus PHILuiPPI 1836). 
Pl. 3 figs. 16—20. 
Radula typical (rhachian tooth with narrower basal plate); shell with spiral 
sculpture only. 
A. Lateral teeth of the radula 5 on each side; whorls flattened with 3—5 spiral 
riblets and 2 stronger on the base; sides of the shell (from apex to base) 
slightly convex; colour pale yellowish or reddish with brown dots or stripes. 
H. up to 28 mm C. conuloide (LAMARCK 1822) 
(= Trochus zizyphinus JEFFREYS 1865, not LINNÉ 1758). 
Pl. 3 figs. 21—2; 
