138 
WILLIAM SMITH : HIS MAPS AND MEMOIRS 
Page 1 begins : — 
" LONDON CLAY 
TESTACEA 
UN I VALVIA 
VOLUTA. 
Voluta spinosa. Sowerby's Mineral Conchology. Fig. 5 and 6, London 
Clay Plate, Strata identified, &c. A cast of the inside of the shell ; 
oblong, with a short spire and not many volutions, a few longitudinal 
undulations on the upper part of each. 
Bognor." 
Other univalves are dealt with ; then follows BIVALVIA. EQUI- 
VALVED BIVALVES, etc., " London Clay " occupying four pages. 
Similar information follows relating to the Crag, Chalk, Green Sand^ 
Brick-Earth, Portland Rock, Oaktree Clay, Coral Rag and Pisolite, 
Clunch Clay and Shale, Kelloways Stone, Cornbrash, Forest Marble, 
Clay over the Upper Oolite, Upper Oolite, Fuller's Earth Rock, Under 
Oolite, Sand and Sandstone and Marlstone. These occupy to page 118. 
Then follows a " Stratigraphical Table of Echini," and there are 
" Obseivations on Echini," occupying other three unnumbered pages. 
This " Table of Echini " is an extraordinary production. It is- 
divided into headings, as under : — 
ANOCYSTI. PLEUROCYSTI. CATOCYSTI. 
Cidaris Clypeus SPATANGUS. Conulus Galea 
Rays in Rays not in 
Furrows. Furrows. 
There are elaborate " Descriptions and Names," and the " Strata 
containing Echini " are Chalk, Green Sand, Coral Rag and Pisolite, 
Cornbrash, Clay over the Upper OoHte, Upper Oolite, Fuller's Earth 
and Rock, and Under Oolite. 
The descriptions of the various species of Echini are somewhat 
quaint ; we quote two : — 
" Oval, very pointed at one end, rounded at the other ; rays- 
biporous one third of the height downwards from the apex, distinct 
on the base ; ridge sharp ; apex excentric towards the broad end." 
