398 Mr. F. M^Coy on some new Mesozoic lladiata. 



edges of the cups gives a supei'ficial 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, excen eric towards the 

 side where the margins are inroUed ; 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 diff*erence of form and size, this is distinguished 

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

 Phillipsii (Reuss, Versteinerungen der bohmischen Kreidefor- 

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



