734 PROF. REYNOLDS AND MR. VAUGHAN ON THE [ Nov. 1902, 
Ammonites striatulus occurs of two very distinct types: the one, 
with rounded whorl-sides, nearly resembles Amm. striatulus, Sow. ; 
the other, with flat sides, is exactly similar to the form so common 
at Wootton-under-Edge, and is Amm. toarcensis, d’Orb. 
Amm. radians is the radians of Buckman, but not of Wright. 
Amm. fallaciosus is the radians of Wright. 
(d) The Cephalopod-Bed. ° 
Capping the sands is a hed, or rather a series of beds, about 10 
feet thick, and very uniform in character throughout. 
Lithologically, this rock is a compact marl, coarsely ironshot and 
often to such an extent as to resemble linseed-meal. It was 
encountered in the three successive shafts numbered 6, 5, & 4; and 
very characteristic specimens of it, labelled with the depth at which 
they occurred, are preserved from each of these shafts, We are thus 
enabled to determine very accurately the average dip of the strata 
in the neighbourhood of the Cross Hands. A simple calculation 
indicates an easterly dip of about 3°5°. 
The rock is crowded with fossils throughout its entire thickness. 
Three separate paleontological horizons can be easily, and 
invariably, distinguished :— 
(1) The Lima-Bed, characterized by the abundance of spe- 
cimens of a very large, flattened Lima of the Htheridgei-type, as well 
as by numerous other lamellibranchs which are identical with, or 
remarkably similar to, common Inferior-Oolite forms. 
(2) The Belemnite-and-Cynocephala-Bed, a thick bed, 
crowded with Rhinchonella cynocephala and with tripartite 
belemnites. 
(3) The Opalinid-Bed, a softer bed, in which ammonites of 
the Opalinid-type are so common that, in places, the rock is entirely 
composed of them. In this bed, as in the Lima-Bed, Oolitic forms 
of lamellibranchiata abound, associated with a few forms of more 
Liassic aspect. 
The following is a complete list of the fossils which have been 
obtained from these beds, assigned, so far as possible, to the 
particular horizon from which they were derived. 
Since there is no direct evidence of succession, these three fossili- 
ferous beds are arranged in descending vertical series by com- 
parison with the sections contained in Mr. Buckman’s paper on the 
Cotteswold Sands.' (In many characters, however, the Lima-Bed 
bears a much closer resemblance to the Opalinid-Bed than it does to. 
the Belemnite-and-Cynocephala-Bed; in particular, we may note the 
abundance of Oolitic lamellibranchs in both the first-named beds 
and their absence from the last.) 
1 «Qn the Cotteswold, Midford, & Yeovil Sands, ete.’ Quart. Journ. Geol. 
Soe. vol. xlv (1889) p. 440. 
