86 F. B. Meek on Acteonide. 
Devonian?) period. D’Orbigny’s description, published in 1842, 
when first proposing to establish a distinct family for these shells, 
The pe» of this family first published by d’Orbigny 
(Paleont. Francaise, Terr. Cret. vol. 2, p. 106) is as follows: 
“« Shell generally oval, without epidermis, marked most usu- 
ally with punctured revolving striz or rows of pits. Spire short, 
sometimes entirely enveloped. Mouth entire or sinuate in front: 
lip simple, trenchant, or reflected and thickened without, some 
times dentate. Columella geome always provided with large, 
more or less numerous, plicati 
The genera then included by him were »—Acteonella, Volva- 
ria, Acton, Ringinella, Ave a Ringicula and Globiconcha. 
To these he subsequently = “TS50) a ded Pedipes,* Varigera, 
(= Sarees Sharpe), and Pterod: 
The following description of this an ily, and arrangement of 
sub- Saopilica, genera and sub-genera, are proposed, after a care- 
ful review and study of all the known genera, both fossil and 
recent, believed by the writer to be related to this interesting 
Groep 
eee ACT AONIDA, oe tee 
rounded or ‘terminating in a noteh or sinus in fro ip en 
pa sharp or obtuse, sometimes vilanian and ‘eisieacdd without, 
mooth or crenate withi 
Animal (in the recent typical genus)* with lingual teeth ip 
diverging transverse series, without a middle row (12-12); 
* Now referred by Conchologists to the Marginellida. 
* Now known to belong to the Auriculide. 
__* Phe structure of the animal here given is of ee known to a se a 
fo are 
ble to the existing species. The extinct 
classified from analogous characters of the shell only. 
, 
