VOL. XIV. (2) RHATIC ROCKS 139 
Upper Rhetic. The “Insect-limestone,” for which the name 
Pseudomonotis-bed is preferable, is a hard, light-grey, fissile 
limestone. The chief interest which attaches to this bed 
consists in the insect remains, which have been described 
by Brodie, who gives the following account of the bed :— 
“The insect remains consist chiefly of elytra belonging to 
several genera of Coleoptera, which are by no means 
uncommon, and a few wings bearing a close resemblance 
to some I have previously detected in the Wealden. 
There are others also which are stated by Mr Westwood 
to be allied to Chauliodes, one of the Neuroptera, and 
referable to the same group as the Wealden wing. Shells 
are not common, but Os¢vea, Unzo, and a small species of 
Modiola are the most abundant; there are also, though 
rarely, a few specimens belonging to the genus MMonodzs. 
Small fragments of carbonized wood, and one or two 
leaves of ferns (Otopteris obtusa) have been met with.” 
It was in this stratum that Brodie discovered “the first 
remains of insects in the Lias of this district.” A con- 
siderable time spent in examining the bed revealed only a 
few indeterminable remains of insects, a J7odzola minima, 
comminuted shell debris, and a piece of lignite. Psezdo- 
monotis decussata | have not recorded from this particular 
bed at Wainlode, but it occurs in the equivalent stratum 
at Coomb Hill. The Pseudomonotis-bed is on the same 
horizon as the “ Cotham Marble” of the Pylle Hill section. 
Above the Pseudomonotzs-bed are finely laminated brown 
and grey calcareous shales, similar to those capping the 
Pseudomonotis-bed at Garden Cliff, Westbury. At Wain- 
lode, the lower portion of these shales contains afew crushed 
Pseudomonotzs. Lithologically they resemble those shales 
below the Pseadomonotrs-bed, and probably it is from this 
deposit, described as “dark-grey, probably Rheetic shale 
1 “ Fossil Insects,” pp. 59, 60. 2 “The Geologist,” Vol. i. (1858), p. 374. 
