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- just below the suture (sometimes continued from these as wavy 
longitudinal lines), and on the spiral row just below the groove 
of the sinus, and finer spiral lines of spots on alternate trans- 
verse rows of costal granules, over the body-whorl to the base. 
Aperture white. Operculum moderately large, elongate-ovate 
acute (Pl. vii., fig. 3c). ; : 
Length, 20 mm.; breadth, 8:25 mm.; aperture length, 10-25 ; 
width, 3°25. 
Type in my cabinet. ; 
Habitat.—Five examples alive in 15 fathoms off Thistle Island, 
in weed, brought up in two successive casts off the dredge 
(Verco). 
Diagnosis.—S. Quoyi, Rve., is a larger shell, with the sub- 
sutural band not at all or scarcely nodulated, and with large 
nodules in the groove of the sinus, and no longitudinal coste. 
S. Owent, Gray, has in the spire-whorls the sinus nodules imme- 
diately above the suture, instead of at or slightly above the centre 
of the whorls. The nodules are only half as numerous, 20 in the 
body-whorl instead of 40; its longitudinal plicse are very fine, 
and are just twice the number of the nodules. 
It is named after Dr. R. H. Perks, the Secretary of our 
Section, a naturalist well known in South Australia. 
The character of the operculum with its apical nucleus suggests 
a doubt whether this shell should be placed in Sureula. Accord- 
ing to Fischer, in his Manuel de Conchyliologie, p. 591, this genus 
has an operculum with its nucleus medio-lateral and internal like 
that of Clavatula, of which he gives a figure. I find, however, 
that the operculum of Surcula Quoyi has its nucleus apical. The 
two shells are conchologically closely allied. I place my species, 
therefore, with it, in Surcula for the present, and leave the 
character of the operculum and its importance as a generic 
Bees for further consideration. 
_ -furrieuta apicitineta, spec. nov. Pl. viii., figs. 4, 4a, 4b. Zz VA 4 
Shell turretted, fusiform, rather thin, shining. Spire, elate of 
eight whorls, including nucleus. Nucleus distinct dextral, two 
turns, excentric, sometimes slightly mammillate, smooth, suture 
well marked, pinkish brown, retaining its color in the dead white 
shell, and prettily tinting its apex. Spire-whorls sloping, 
convex, the convexity varying in different individuals, Longi- 
tudinally finely costate throughout; cost most valid in the 
earlier whorls, about 35 in the penultimate, slightly nodulated at 
the posterior suture, wider than the interstices in the earlier 
whorls, narrower in the later, rounded, rather broader than high; . 
Sutures distinct impressed. Transverse lirz numerous, three in 
the penultimate whorl, flattened, wider than the interstices, 
scarcely 
