Mr. F. M'Coy on some new Mesozoic Radiata. 409 



tween the rays acute; disc and middle of the rays closely 

 covered with blunt tubercles about f ths of a line in diameter. 

 Each ray about h\ inches long and 1 inch wide at base. 



This species is distinguished from the A. Aalensis (Miinst.) 

 and the A. arenicola (Gold.) by the very long, rigid, straight- 

 sided rays, there being no dilatation beyond the base as in those 

 species, as well as its greater size, perfect specimens being up- 

 wards of a foot in diameter, while the others are little more than 

 half that. The Astropecten Orion (Forb.) seems much allied, 

 but is a smaller species with longer rays, the interradial angles 

 obtuse, and the lateral plates square and much fewer in number. 

 The starfish figured from the same locality as this in Charles- 

 worth's f London Geol. Journal/ no. 3. pi. 17, as the A. arenicola 

 of Goldfuss, agrees with the present species in every particular 

 save the dilatation of the rays beyond the base ; this character 

 exists clearly in the species of Goldfuss, which however is per- 

 fectly distinct by its shorter rays and other characters. I sus- 

 pected that in the English fossil alluded to, this appearance might 

 have been a fault of the artist ; Forbes however has I presume 

 seen the species, as he describes it (Mem. Geol. Survey, vol. ii. 

 part 2. p. 477) in accordance with this figure, also referring it to 

 Goldfuss* s species, but without referring to the figure of that 

 author, which is most accurate. 



Not uncommon in the calcareous grit of Filey Brig, Yorkshire 

 coast. 



(Col. University of Cambridge : three specimens.) 



(Echinida.) 



Echinus petallatus (M'Coy). 



Sp. Char. Conoidal (diameter 1-J- inch, height 1 inch 2 lines), 

 base slightly contracted, obscurely ten-lobed ; ambulacral arese 

 half the width of the interambulacral, three oblique pairs of 

 pores in each row ; the ambulacral and interambulacral spaces 

 have each an elliptical, petal-like, concave, smooth space ex- 

 tending from the vertex nearly to the base, each space being 

 one-third the width of its respective area ; the upper two-thirds 

 of the ambulacral arese have but one row of large tubercles on 

 each side, surrounded by a circle of very minute granules; 

 towards the base where the smooth central space stops there 

 are four rows of large tubercles ; the upper third of the inter- 

 ambulacral spaces has but two rows of large tubercles with 

 their circle of small granules, but they gradually increase to- 

 wards the base, and at the end of the smooth space there are 

 about eight rows. 



This is allied to the E. gyratus (Ag.), but is distinguished by 



