322 
Transactions of the Society. 
A very distinct Gault form, consisting of 8-12 chambers. The 
shell is composed of sandy particles of a pale to a ruddy-brown colour 
and of medium texture. The arched slit-like aperture is very nearly 
central. In a few examples the last chamber is developed to twice 
the usual length, thus imparting a crosier-like aspect to the shell. 
This species is recorded by Dr. v. Reuss from the Flammenmergel 
and Miuimusthon of North Germany, and also as occurring “ seldom 
and generally small and imperfectly formed ” from the Folkestone 
Gault. A form from the Neocomian (?) beds of the Richmond Well- 
boring is recorded by Prof. Rupert Jones under the name of Haplo- 
phragmium depressum, Quart. Journ. Geol. Soc., vol. xl. p. 765, 
plate xxxiv. fig. 1, which closely resembles the above form. 
Zone i., specimen h, common ; zone ii., specimen b, common ; zone ii., 
specimen c, very common ; zone iii., rare ; zone iv., very common ; 
zone v., very common ; zone vi., frequent ; zone vii., very common ; 
zone viii., common ; zone ix., common ; zone x., very common ; zone 
xi., 55 ft. from the top, common ; 50 ft., common ; 45 ft., very 
common ; 40 ft. common ; 35 ft., common ; 30 ft., very rare ; 25 ft., 
common ; 12 ft., common ; 6 ft., common. 
Haplopliragmium elegans, plate V. fig. 10. 
This variety, which appears to merit a distinctive name, though 
perhaps only as one of local value, has probably arisen from 
II. nonioninoides by the angulation of the middle dorsal portion of 
each segment, thus giving to the shell the scalloped contour. In the 
shape of the aperture and in the width of the shell the two forms are 
similar. There are six chambers showing in the specimen figured. 
Diameter 1/35 in. It is found in zone ix., one specimen ; zone xi., 
55 ft. from the top, one specimen. 
Haplopliragmium acutidorsatum Hantken, plate Y. figs. II a, l, c. 
Haplopliragmium acutidorsatum Hantken, 1868, Magyar. Foldt. 
Tarsulat., vol. iv. p. 82, plate i. fig. 1. 
This species resembles H emaciatum Brady, but with the difference 
that in the latter form the whorls are evolute, whilst in H. acutidor- 
satum they are involute. The specimens from the Gault are almost 
white, and consist of about eight chambers. The central portion of 
the side of each chamber is slightly concave, instead of presenting a 
full even surface as in the specimens figured by von Hantken from the 
Hungarian Tertiaries ; and the slit-like aperture is placed slightly to 
one side. Fig. 11c shows the chambered structure of the shell and also 
the stolon passages between the last few chambers ; this is an example 
from the Gault of Merstham. It is found in zone i., specimen b, very 
rare ■, zone ii., specimen b, frequent ; zone ii., specimen c, common ; 
zone iii., very common ; zone iv., frequent ; zone v., frequent ; zone 
vi., very rare ; zone vii., rare ; zone viii., rare ; zone ix., very rare ; 
