eam 
Wi 
neces made to it by Dr. Gould, seems to differ from it but slightly. 
The Acteon, De Montfort, ( T’ernatella, Lamarck,) is easily dis- 
tinguished from these genera by the fold on the columella, and it 
unquestionably has priority over Odostomia, Fleming, and Ja- 
minia, Brown. There are also the genera Truncatella, Cho- 
ristoma, Alvania and Acmea, which I have only met with* as 
synonymes to Rissoa. 
Genus Actzon.—De Montfort. 
A. parvus. Pl. 1, fig. 7. 
A. testa acuto-conoidea, sub-tenui, leevi, alba, nm bilieatii? spira 
acuta; anfractibus quinis, platralatis ; suturis linearibus ; ultine’ 
Sit fratea sub-angulato; umbilico parvo; apertura suits effusa ; 
columella uniplicata ; labro acuto. 
Shell acutely conical, somewhat thin, smooth, umbilicated ; 
spire acute; whorls five, flattened ; sutures linear ; last whorl sub- 
angular; mouth ovate, somewhat effuse; columella with one 
fold ; outer lip acute. 
Estigit ‘075. Breadth -037 of aninch. | 
Hab. Delaware Bay. Cabinet of I. Lea. 
- Remarks.—In this little species there is nothing very remark- 
able. The mouth is 025 of an inch in length, and not very 
acutely angular above. It appears to have a thin, horny opercu- 
lum, though from the extremely small size of the shell, I cannot 
be certain as to that point. The only one of our species with 
which it can be confounded, is the Acteon trifidus, Totten, but 
the umbilicus, want of transverse strie, and the difference in the 
shape of the mouth, will immediately distinguish it from that 
shell. It bears énnsioniile resemblance to one or two fossil spe- 
cies described by M. Grateloup,t from near Dax, in France. 
Genus Ceriruium.—Bruguiere. 
C. cancellatum. PI. 1, fig. 8. 
C. testa turrita, sub-tenui, tenebroso-fusca, sub-perforata, cancel- 
lata, sulcis longitudinalibus, striisque transversis; spira acuta; 
anfractibus octonis, convexis; suturis sub-profundis ; basi ken 
nea ; apertura elliptica, supra angulata, infra sub-canaliculata ; co- 
lumella brunnea; labro acuto; operculo nigro. 
Shell turrited, somewhat thin, dark brown, sub-perforate, can- 
* The three first genera in Philippi’ - ka _ napmerstie Mollascoram Sicilie,”’ seg 
dhe: in Cuvier's ‘« Animal Ki 
t Transactio. ns of the the Linnean Society of Bordeaux, fr November, 1858. 
aoe 
