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



edges of the cups gives a superficial resemblance to some Lobo- 

 phyllice. 



Not uncommon in the greensand of Lyme Regis. 



(Col. University of Cambridge.) 



Jerea pastinaca (M'Coy). 



Sp. Char. Very elongate- conic, subcylindrical, gradually tapering 

 towards the base (the extreme apex sometimes abruptly nar- 

 rowed), free end obtusely subtruncate with rounded margin, 

 but not contracted in diameter ; mouths of the vertical excre- 

 tory tubes rather less than a line in diameter, chiefly confined 

 to a circular area in the middle about half the diameter of the 

 individual, leaving an external margin about one-fourth the 

 diameter of a dense reticulated substance having a slightly 

 radiated structure in the cross section and destitute of the 

 large tubes. Average length 6 inches, diameter 2 inches, or 

 larger. 



This species resembles a carrot or parsnip in size and shape, 

 whence the specific name ; it is distinguished from the Siphonia 

 pistillum (Gold.) and Jerea pistilliformis (Lamx.), besides its pe- 

 culiar form, by the vertical tubes being confined to the central 

 part of the cylindrical mass, while in the terminal disc or trans- 

 verse section of those species they are seen to open almost uni- 

 formly through every part ; they are also much more numerous 

 and rather smaller than in the present fossil. 



Very common in the greensand of the Vale of Pewsey, Wilts. 



(Col. University of Cambridge.) 



Manon Reussii (M'Coy). 



Sp. Char. A large, auriform, foliaceous expansion, averaging 

 rather more than half an inch thick and from 3 to 5 inches in 

 diameter ; undulato-concave above and irregularly convex be- 

 low ; the pedicle of attachment small, excencric towards the 

 side where the margins are inrolled ; edge obtusely rounded, 

 of a fine lacunose or spongy texture ; upper and under surfaces 

 with thickly scattered, prominent, wart-like mouths of excre- 

 tory ducts a line in diameter, averaging twice their diameter 

 apart on the upper surface, more crowded and irregular on the 

 lower ; intervening spaces of a more dense and uniform porous 

 structure than the margins. 



Besides the difference of form and size, this is distinguished 

 from the Spongia marginata (Phil., Geol. of Yorkshire) and M. 

 Phillipsii (Keuss, Versteinerungen der bohmischen Kreidefor- 

 mation) by having the large excretory pores on the outer as well 



