750 
Transactions of the Society. 
regards profusion and size, in the Plicatula bed, zone x., at Folke- 
stone, where it attains a length of 1/15 in. It is recorded by 
Eeuss from Folkestone, and from various strata of Upper Cretaceous 
age in Germany and Bohemia, including the Gault. It has been 
recorded by Dr. Brady as a recent tropical form, from one station 
only, at a depth of 155 fathoms. At Folkestone it is found in zone v., 
very rare ; zone vii., very rare ; zone x., very common ; zone xi., 50 ft. 
from the top, very rare ; 45 ft., very rare ; 35 ft., frequent ; 30 ft., 
common; 25 ft., frequent; 20 ft., very rare; 12 ft., very common; 
6 ft., common. 
Tritaxia pyramidata Reuss, plate XI. fig. 2 a, b. 
Tritaxia pyramidata Reuss, 1862, Sitzungsb. k. Ak. Wiss. Wien, 
vol. xlvi. p. 32, plate i. fig. 9 a, b, c. T. pyramidata Berthelin, 1880, 
Mem. Soc. geol. France, ser. 3, vol. i. No. 5, p. 25, plate i. fig. 9 a-c. 
This form was originally described by Reuss from specimens found 
by him in the Minimus- Thon and Flammenmergel of North-west 
Germany ; and he also notes it from Folkestone. It has been re- 
corded by Berthelin from the Gault of Montcley. This somewhat 
wild-growing form occurs in the Gault in zone vii., rare ; zone viii., 
very rare ; zone x., common ; zone xi., 50 ft. from the top, common ; 
30 ft., frequent; 25 ft., frequent ; 20 ft., common; 12 ft., common ; 
6 ft., common. 
Spiroplecta Ehrenberg [1844]. 
Spiroplecta annectens Parker and Jones sp., plate XI. fig. 3 a, b. 
Textularia annectens Parker and Jones, 1863, Ann. and Mag. 
Nat. Hist., ser. 3, vol. xi. p. 92, woodcut, fig. 1 . Spiroplecta annectens 
Brady, 1883, Chall. Rep., vol. ix. p. 376, plate xlv. figs. 22, 23 a, b. 
In many Textularian forms there is a more or less decided 
tendency for the test to commence spirally, before taking on the 
biserial arrangement of the chambers. In the case of those spirally 
commenced forms which can be referred to their Textularian equiva- 
lents, 1 have retained the specific name whilst placing them in the 
genus Spiroplecta , and such an example may be found in the Spiro- 
plecta annectens; other forms there are, however, which do not 
resemble any type species of Textularians, and in these cases it is 
convenient to give distinct specific names. This form has been 
recorded from the Gault of the South-east of England and of Biggles- 
wade, by Messrs. Parker and Jones, and from the latter locality the 
specimens obtained were so extraordinarily developed that they 
exhibited a trimorphous arrangement, commencing spirally, pro- 
ceeding biserially, and ending uniserially. By the kindness of Pro- 
fessor Rupert Jones I have had an opportunity of examining the 
specimens of Spiroplecta collected from the two localities above 
mentioned, and also the privilege of seeing the notes and drawings 
made by the late Professor Kitchen Parker referring to the same. 
