﻿SOLARIUM. 



323 



256. Solarium polygonoides, sp. nov. Plate XXVI, fig. 9. 



Description : 



Diameter . . . . .4 mm. 



Height . . . . .3 mm. 



Spiral angle . . . . .115°. 



This rare form, although related to the species last described, differs from it 

 in being somewhat less depressed ; the radial costas are wider apart, and more 

 strongly developed towards the periphery, thus imparting a slightly polygonal 

 outline, which is well seen in the body-whorl. The bicarination of the body- 

 whorl is less pronounced, and the ring of tubercles at the margin of the umbilicus 

 less distinct. [The conditions of preservation leave some doubt upon this 

 point.] 



Relations and Distribution. — From specimens of 8. polygoniurn, d'Arch., in the 

 Great Oolite of Minchinhampton this form is distinguished by the greater number 

 and lesser salience of the angles of the periphery, and by other points of 

 ornamentation. As a matter of fact, S. polygonoides would seem to occupy an 

 intermediate position between S. pisoliticum and 8. polygonium, and this accords 

 with its stratigraphical position in the Clypeus-grit at Barrington. A single 

 specimen. 



257. Solarium diadema, Lycett, MS. Plate XXVI, fig. 10. 



Note. — No publication has given me so much trouble and cause for perplexity 

 as the paper by Lycett on the " Fossil Shells from the Inferior Oolite in 

 Gloucestershire," which appeared in the first volume of the ' Proceedings of the 

 Cotteswold Naturalists' Club ' in 1853 ; and previously in the ' Annals.' In that 

 paper (p. 80) Lycett describes " Solarium " Gotswoldise and no other species, 

 although previously (p. 72) he had enumerated in addition three species of 

 Solarium, one of which received the specific name "diadema." 



Of mere names in a table I should not feel bound to take notice unless there 

 was corroborative evidence on the point. It so happens that in Mr. Brodie's 

 Collection there is a very pretty fragment marked " Solarium diadema," presumably 

 on Lycett's authority. It is different from any other form, and seems worthy of 

 distinction. 



Description- : 



Diameter . . . . .7 mm. 



Height . . . . .6 mm. 



Spiral angle ..... 100°. 



