GASTEROPODA. 30 
Skxenea PLanorsis, F. et H. Turbo planorbis, O. Fabr. 
Skenea serpuloides, Gould, 247, f. 189. (non Angl.) 
— Litt. From Cape Cod northward. 
TURRITELLIDA. 
TurRITELLA cosTuLaTA, Migh. et Ad., Bost. Jour., iv. 50. 
—Corall. Eastport Harb., 30 f., rocky bottom, (W. 8.) 
Casco Bay, (Migh.) 
T. AREOLATA, St. Bost. Proc. iv. 16. 'T’. parva, subper- 
forata, turrita, rubra, costis transversis, distantibus, 
quatuor, (duabus ad anf. sup.) et plicis elevatis, inter- 
ruptis, —areolata; anf. 6 convexi; apertura anticé 
effusa; labro acuto. Long. .18, lat. .09, poll. 
This is probably a young shell, but it appears dis- 
tinct from any of our species. It approaches 7. re- 
ticulata, Migh., from the Gulf of St. Lawrence, but 
the transverse ribs are more prominent, and the lon- 
gitudinal ones less so, than in that shell. 
Corall. Mass. Bay. 
T. serosa, Couth. Gould, 267.— Corall., and Dp. 5S. 
Coral. In 50 f. mud, off Campo-bello, near Eastport, 
Me., (W. 8.) and southward to Cape Cod. 
T. acicuna, St. Pl. I.f.5. Bost. Proc. iv. 15. T. parva, 
turrita, subulata, candida, tenuis; anf. 10 valdé con- 
vexi, longitudinaliter striati, costis transversis qua- 
rum tribus majoribus, cincti; apertura rotundata, 
anticé effusa, labro acuto. Long. .22, lat. .08, poll. 
Corall. Off Grand Manan, in 40 f. sandy mud, 
and near Duck Island, in 5 f. sand, (W. 8.) and 
southward to Cape Cod. 
