104 SUPPLEMENT TO GREAT OOLITE MOLLUSCA. 



Geological Position and Locality. The Porest Marble of Burton Bradstock ; in the 

 collection of W. Walton, Esq. 



Phasianella variata, Lye. Tab. XLV, figs. 28, 28 a, h. 



Testa ovato-elongata, sjpira acuta, anfractibus (6-7), subconvexis, latiusculis,suturisvalde 

 itnpressis, ultimo anfractu amplo, apertura obliqua, ovato-elongata. 



Shell variable in figure, ovately elongated ; spire lengthened, with the apex acute ; volu- 

 tions six to seven, wide, more or less convex ; the sutures strongly impressed ; the last volu- 

 tions conformable, the aperture oblique, ovate, narrow, but always less than half the height 

 of the shell. 



The variability in the convexity of the volutions and their height is considerable. The 

 general aspect resembles P. elegans, Mor. and Lye, in which the spire is always less 

 pointed and less slender, the last volution being also longer. 



Geological Position and Locality. The Porest Marble of Laycock ; in the collection of 

 W. Walton, Esq. 



Solarium turbiniformis. Lye. Tab. XLV, figs. 23, 23 a, b. 



Testa turbinata, spira dextra, elevata^ obtusa, anfractibus (4), tuberculis nunierosis, coro- 

 natis ; basi convexa, umbilico magno, margine, nodis {circa 9) cingendo, sujperjicie lineis 

 transversalibus et longitudinalibus decussatis ; apertura suborbiculari. 



Shell turbinated, spire dextral, elevated, volutions four, their borders coronated with a 

 circle of tubercles, about eighteen in a volution ; the base is convex, with a large and 

 deep umbilical cavity, bordered by large nodose elevations, about nine in the volution ; the 

 aperture is suborbicular ; the entire surface has encircling lines, with more narrow inter- 

 stitial spaces decussated and rendered granular by densely arranged transverse striations. 



Allied to Straparollus alius, D'Orb. ; the latter species, however, has the last volution 

 more elevated and the sides much more flattened, which impart a subquadrate figure to 

 the aperture ; the nodose elevations encircling the umbilicus are also fewer and larger. 



Geological Position and Locality. The Great Oolite of Hampton Cliffs ; in the collec- 

 tion of W. Walton, Esq. 



Solarium Waltoni, Lye. Tab. XLV, figs. 20, 26 a, b, c. 



Testa discoidea, latere superiori et inferiori concavo, dorso angusto, convexo, tuberculis 

 per series duobus instructis ; latere superiori anfractibus subconcavis, varicibus obscuris 



