IKEDALE : SYNOPSES CONTENTS BEITISH MUSEDM. 303 



Atrifia, 1840. 1842, p. 83. "The Finna have an elongated shell 

 with a longitudinal crack filled with a cartilage in the middle 

 of eacli valve, and Atrina are shorter shells without any such 

 crack." 



Azar, 1840. In the Proc. Zool. Soc. 1847, on p. 186, Azor, Leach, 

 MkSS. 1819, is included with type Solen vesperthms. On p. 189, 

 Azor, Leach, MSS. 1819, is again included with type Solen 

 anfiquatus. Its usage in connexion with the latter species needs 

 investigation. 



Bacalia, 1840. Does not seem to be further mentioned by Gray, 

 either in 1842 or 1847. H. & A. Adams (Gen. Eec. Moll., 

 vol. i, p. 312, 1854) quote it as a synonym ot Liitorina, a con- 

 clusion which its position in the previous tables (between 

 Ulsso, = jyiso, and Rissoa) would not liave suggested. 



Bankia, 1840. 1842, p. 76. "In Bankia thty [the pallets of 

 Teredo~\ are elongated, and formed of small cones one within the 

 other, looking somewhat like a quill." 



Barhatia, 1840. 1842, p. 81. '' The Bariaiia are elongated shells, 

 covered with a hairy periostraca ; the teeth on the middle of the 

 line are small, of the ends large and oblique." 



Barnia, 1840. 1842, p. 76. " Pholas has an elongated shell with 

 three pieces on the back. The Barnia has only one piece, and 

 the Zirfcea are short shells with very large gapes at each end, 

 and no distinct dorsal pieces. The Martesia, when the animal 

 arrives at full size, closes up the gape in front of the shell with 

 a shelly plate, and the dorsal ligament is covered with a large 

 shield like convex plate. The Talona differ from the latter in 

 being longer, and in the back margin being reflecteil, and only 

 furnished with two small back pieces." 



Jiolania, 1840. Not further mentioned, either in 1842 or 1847. 



Brachi/chlamns, 1840. 1847. Brachychlanis, Ehr. 



Brijopa, 1840. 1842, p. 77. "The Bryopce, which are only known 

 in a fossil state, appear to have lived in sand like the Asper- 

 ffillmn, for the tubes are of a regular club shape with a fringe of 

 small tubes round the disk." 

 Callia, 1840, p. 129. 1840a, p. 133. " The Ca/lue have a peculiarly 

 polished shell very like the former \_FHpiua"], but they want the 

 groove." 

 Camitia, 1840. 1842, p. 57. "The Talopia are like the Rotella; 

 the shell is striated and umbilicated, the umbilicus being edged 

 with a striated callus edge, which in Camitia is so large as 

 nearly to hide it." 

 Catmabiiia, 1840. 1847. ? Cannabina, Gray, 1840. No type or 



further information given. 

 Cardinalia, 1840. 1842, p. 56. "In Pyramis the front of the 

 inner lip lias a slight canal, and in Cardinalia it ai>i)ears 

 notched." 

 Cepatia, 1840. 1842, p. 60. "The operculum of JVatica is simply 

 liorny ; Cepatia differs in the axis being covered witli a large 

 callosity. Mammilla chief! v differs from the latter in tlie axis 



