84. CRETACEOUS LAMELLIBRANCHIA. 
Non 1873. ‘Trtconra attrormis, H. B. Geinitz. Das Elbthalgeb. in Sachsen (Paleon- 
; toegraphica, vol. xx), pt. 2, p. 58. 
— 1897. — ALmFormis, A. Fritsch. Stud. im Gebiete der bohm. Kreide- 
format. vi. Die Chlomeker Schichten, p. 55, 
fig. 60. 
Types.—From Blackdown. I have not been able to trace the type. Sowerby’s 
specimens are in the British Museum, except the original of fig. 3, which is in the 
Bristol Museum. The specimens figured by Lycett are in the Museum of 
Practical Geology (figs. 3—6), and in Mr. Vicary’s collection (pl. xxvin, fig. 5). 
The specimen figured by Newton is m the British Museum. 
Distribution.—Greensand of Blackdown (Zones iv to vi) and Devizes. Stated 
by Lycett to occur at Haldon, but not recorded by Downes (1882); I have seen no 
example from that locality. Zone of Hoplites interruptus of Okeford Fitzpaine. 
The variety attenuata is found in the Upper Greensand of Niton, Ventnor, and 
Warminster. Agassiz’’ record of this form from the Greensand near Cambridge 
is erroneous. ? Folkestone Beds of Copt Point, Folkestone. 
TricontA Mnyert, Lycett, 1875. 
1875. Lycett, p. 125, pl. xxiii, fig. 6; pl. xli, figs. 15, 16. 
1896. A. J. Jukes-Browne and W. Hill. Quart. Journ. Geol. Soe., vol. lii, p. 154. 
Types.—In the Museum of Practical Geology—from near Sidmouth and Duns- 
combe. 
Distribution —Cenomanian (Meyer's Beds 10, 11, 12) of Dunscombe, Culver 
Hole (Devon), west of Pinhay, ete. Base of Chalk Marl (zone of Schlanbachia 
varians) of Titherleigh, near Chard. 
Triconta Vucttana, Lycett, 1875. 
5 eK 
Additional Synonymy. 
1818. Triconra aLHrormis, J. Sowerby. Min. Conch., vol. iii, p. 27 (parti), 
pl. cexv, fig. 2 (not 1, 3, 4 
). 
1875. = Vecriana, Lycett, p. 128, pl. xxiv, figs. 10, 11; pl. xxv, fig. 7. 
Types.—Museum of Practical Geology—from the Perna-bed of Atherfield. 
Distribution.—Perna-bed and Bed 45 (Fitton) of Atherfield. Perna-bed of 
1 «tudes crit. Moll. Foss.,’ Trigon. (1840), p. 31. 
