ACT ZONIDA. 229 
SUPPLEMENT TO MONOGRAPHS OF TECTIBRANCHIATA CEPHAL- 
ASPIDEA. 
Family ACTEONIDZ (Vol. XV, p. 135). 
Genus ACT ZEON (p. 147). 
A. ExILis Jeffreys (Vol. xv, p. 156) has also been dredged off 
Treland to the southeast of Rockall, in 1215 fms. (Norman, Ann. 
Mag. N. H. [6], vi, 1890, p. 63). Another figure is given in Proc. 
Mal: Soe. i, pl. 16, f. 8. 
Cossmann refers this species to Crenilabium, asubgenus of Actwon- 
idea. ‘The latter group is in reality a synonym of Rictazis Dall, 
1871 (not 1891 as Cossmann states). The references to Crenila- 
bium are as follows: 
Crenilabium Cossm., Catal. Illustr. des Coq. Foss. de ’éocene des 
Environs de Paris, in Annales de la Soc. Roy. Malac. de Belgique, 
xxiv, 1889, p. 302 (type A. aciculatus Cossm.); Ess. Pal. Comp., 1, 
p. 53.—Lissacteon Monrrrosarto, I] Naturalista Siciliano, p. 188, 
1890 (type A. exilis Jeffr.). 
A. BRown! Jordan. PI. 61, fig. 60. 
Shell spindle-shaped, opaque and somewhat glossy. Sculpture 
numerous spiral incised lines, those on the base being much stronger 
and visible to a sharp eye without the aid of a lens; the spaces be- 
tween these lines vary in width. Color ivory white; spire moder- 
ately elongated and gradually tapering to the apex. Whorls 5, but 
possibly 6, the apex being broken off, moderately rounded, the last 
forming about two-thirds of the shell. Suture slightly chanelled 
when examined by looking down the spire ; mouth about two-thirds 
of the length of the shell, acute angled above. Outer lip thin and 
unfortunately broken. Inner lip inconspicuous; pillar short and 
flexuous. Fold or plait winding obliquely down the pillar, and not 
tooth-like as in A. tornatilis. Operculum ear-shaped and marked 
with transverse lines of growth. Long. 8°12, diam. 3°15 mill. (Jor- 
dan). 
“Warm area, Faroe Channel,” about 80-90 miles N. of the Butt 
of Lewis, 570 fms. 
Acteon browni JORDAN, Proc. Malac. Soe. i, p. 267, pl. 16, f. 7. 
One specimen collected. 
