SUPPLEMENT. 491 
CHI1LODONTOIDEA, genus nov. 
Shell short, thick, eucycloid, slightly pupxform, imperforate. Whorls irregular, 
the anterior ones carinate ; body-whorl considerably shorter than the spire; ornamen- 
tation subreticulate. Aperture externally quadrate and oblique, with a double callosity 
on the columella, which is dentate at the angle ; a broad callosity inside the outer lip 
further restricts the aperture internally. 
There are many points of resemblance between this curious genus and Chilo- 
donta, Etallon, which, however, is represented as having five internal teeth or 
callosities. ‘The Corallian genus also has a more distinctly trochiform spire, 
though the character of the ornamentation is somewhat similar. Fischer “‘ Manuel,’ 
p. 818) makes Chilodonta a sub-genus of Clanculus, one of the Trochide. In this 
connection the following references may be useful. 
Chilodonta clathrata, Etallon. Corallien du Haut Jura ii, p. 54. 
Trochus (Monodonta) clathratus, Etallon. Zittel, Gast. Stramb. Schicht, p. 329, 
pl. xlvii, figs. 27 and 28. 
Chilodonta clathrata, Etallon. De Loriol, Mém. Soe. Pal. Suisse, vol. xvii 
Gis90)5 p. 147, .pl. xvi, fig. 15. 
454, CHILODONTOIDEA OOLITICA, sp. nov. Plate XLIII, figs. 19, 20 a, 20. 
Description : 
Height ‘ 3 : 9 mm. 
Body-whorl to total height : : oy edo LOO: 
Spiral angle irregular and convex. 
The apex is sharp; number of whorls eight, flat to subconvex in the early 
stages, strongly carinate in the later ones, and separated by a deep suture. The 
ornaments in the upper part of the whorls consist mainly of delicate and rather 
sinuous axial lines, which on the keels produce a fine granulation ; in the anterior 
portion of the whorls the ornaments are chiefly spiral. The shell gapes somewhat 
between the penult and body-whorl, which latter is stumpy, and towards the 
aperture its, upper margin encroaches on the penult. The body-whorl is carinate 
and spirally ornamented on the base. There are, however, considerable differences 
in ornamentation according to locality. 
The characters of the aperture are those of the genus. 
Relations and Distribution—The distinction between this form and Chilodonta 
