shell, a member of the division of ampullariform Natics, was found by the Duchess of Argyle in the pleistocene beds at Ardincaple. That specimen was presented to Mr. Smith, and was figured and described by Captain Brown in the eighth volume of the Wernerian Transactions. It has since, unfortunately, been destroyed. From its delicacy, it is not likely to occur in the more disturbed beds of the drift, but should be looked for in the Clyde beds. It is extremely probable that when an opportunity for comparison may occur, the Bulbus Smithii will be found to be identical with the Natica flava of Gould, a rare living inhabitant of the Newfoundland Bank.
[150. Coriocella perspicuus (Helix sp.), Linnæus.
Syn., Bulla haliotoidea, Montagu. Sigaretus haliotoideus of Fleming.
Loc., fossil. Sweden.
Loc., living. Seas of Europe and Boreal America.]
151. Bulla obtusa, Montagu.
Syn., Bulla minuta, Woodward.
Loc., fossil. Mammaliferous crag.
Loc., living. European Seas.
152. Margarita undulata, Sowerby?
Syn., Trochus inflatus, Smith. Trochus tumidus, Hisinger (not of other authors).
Loc., fossil. Clyde beds. [Sweden.]
Loc., living. Arctic Seas and seas of Boreal America. Very rare in the northern European region.
153. Trochus ziziphinus, Linnæus.
Loc., fossil. In the upper beds of the Irish drift. The variety found is very strongly ribbed spirally, and the ridges slightly nodose. The same variety now lives in Falmouth harbour.
Loc., living. Throughout the Northern, Celtic and Lusitanian regions of the European Seas, but chiefly developed in the two former.
Note, It occurs in the red crag.
154. Trochus exasperatus, Pennant
Syn., Trochus exiguus, Montagu. Trochus crenulatus, Brocchi.
Loc., fossil. One of the southern species which occur in the Wexford beds.
Loc., living. In the southernmost parts of the British Seas, and abundant in the Lusitanian region. Phillippi enumerates it among Ehrenberg's Red Sea shells.
155. Trochus cinerarius, Linnæus.
Loc., fossil. In the Scotch, and rarely in the Irish beds.
Loc., living. In the northern and Celtic regions of the European Seas.
156. Trochus tumidus, Montagu.
Loc., fossil. Dalmuir.
Loc., living. In the northern and Celtic regions of the European Seas.
Articulata.
Cirrhipeda.
1. Balanus communis, Pulteney.
Syn., Lepas balanus, Linnæus. Balanus sulcatus, Lamarck.
