404 Mr. F. M'Coy on some new Mesozoic Radiata. 



surface with fine longitudinal punctured strise (about seven in 

 the space of one line) ; for rather more than a line from the 

 edge of each cell, every alternate superficial ridge becomes 

 narrowed and depressed, the intervening ones suddenly ac- 

 quiring a greater thickness and prominence, giving a plicated 

 appearance to the ends of the branches ; cellular axis and alter- 

 nating lamellae of the star as in the allied species of the 

 genus. 



This species most resembles the Lithodendron {Dendrophyllia) 

 granulosa (Munst.) of the Abtenau tertiary beds, of which Gold- 

 fuss has given a tolerably good figure in his ' Petrefacten/ but 

 the stem is smaller, not nexuous nor marked with annular con- 

 strictions ; it is also much more finely striated, and is remarkable 

 for the peculiar plication produced by the unequal projection of 

 the alternate ridges towards the mouths of the cells. 



Coralline oolite, Steeple Ashton. 



{Col. University of Cambridge.) 



Chrysaora similis (M'Coy). 



Sp. Char. Corallum forming depressed rounded masses (usually 

 about half an inch in diameter) ; upper convex surface with 

 numerous small conical projections, generally rather less than 

 a line apart, from which small, irregularly branching ridges 

 radiate ; the projecting points and ridges seem nearly solid and 

 smooth, the intervening spaces coarsely punctured by the 

 closely-placed openings of the minute cells. 



This is so closely allied to the Ceriopora [Chrysaora) venosa 

 (Gold.) of the Essen greensand that I scarcely can define their 

 difference ; the figures of Goldfuss of this latter species are both 

 2\ diameters larger than nature, but making this allowance the 

 character of the surface is nearly the same in both ; the present 

 oolitic coral seems however to be constantly smaller and more 

 delicate in all its parts, and forms smaller and more depressed 

 masses. 



Great oolite. Not uncommon at Minchinhampton. 



{Col. University of Cambridge.) 



ECHINODERMATA. 



Crinoidea. 



Bourgueticrinus cylindricus (M'Coy). 



Sp. Char. Column elliptical ; body cylindrical, scarcely exceeding 



the stem in diameter, composed of four upper columnar joints 



of equal diameter, but the two upper thinner than the third, 



the fourth nearly double the thickness of the third, round in 



