340 ECHINOBRISSUS 



the Royal Agricultural College Farm, which is the best locality ; at Coates, at the Wood- 

 house in Earl Bathurst's Park, at Downs Farm, and Stowell Park, on the Stow Road, 

 and at Stratton, and North Cerney, near Cirencester. The specimens obtained from the 

 Woodhouse were from some light excavations to mend a private road, where they were 

 abundant. In one instance (near Stowell Park) the rubbly bed containing the E. 

 Woodwardii was covered over with Bradford Clay, about two feet in thickness, when 

 the characteristic fossil Terebratula digona, Sow., occurred in abundance. In two or 

 three instances E. Woodwardii was found associated with Trigonia Phillipsii, Lye, which 

 has not been very long recognised as a Gloucestershire shell ; it is not improbable that 

 the two may be found together in Northamptonshire. I am not aware that this species has 

 been found out of the Great Oolite. 



In three specimens collected from the same white marly bed of the Great Oolite, whilst 

 this sheet was passing through the press, the small apical disc is better preserved than in 

 those I had previously examined. The ovarial plates are long, narrow, and lanceolate, 

 with large, oblique, oviductal holes, perforated near their apices, the madreporiform body 

 covers so much of the disc, that I cannot discern whether there are supplementary plates 

 in its centre as in E. orbicularis. The ocular plates are small, and have minute marginal 

 orbits. 



EcHiNOBRissus Griesbachii, Wric/ht, nov. sp. PI. XXV, fig. 1 a, b, c, d, e, f. 



Test quadrate, elevated ; sides tumid ; posterior lobes small ; apical disc large, expanded ; 

 anal opening large, adjoining the disc without any intermediate depressed space between 

 the disc and the vent ; poriferous zones narrow ; pores approximated throughout ; anal 

 valley wide. 



Dimensions. — Height, four tenths of an inch ; antero-posterior diameter, three 

 quarters of an inch ; transverse diameter, nearly equal to the length. 



Description. — I am indebted to my friend, the Rev. A. W. Griesbach, for calling my 

 attention to this new form, which has hitherto, doubtless, been considered a small variety 

 of E. clunicularis. After a careful study of this urchin, I feel disposed to adopt my 

 friend's view, and in justice to Mr. Griesbach, I subjoin his notes on this species, in which 

 he has most accurately pointed out its diagnostic characters : 



" There is a small nucleolite found in the Great Oolite round about here, which I have 

 for a long time heedlessly confounded with N. clunicularis, but which I yesterday discovered 

 to be quite a distinct form, and I do not know any other species to which it can be 

 referred. I have seen it at Wimmington, Higham Ferrers, and Blisworth, and have 

 received a specimen from Mr. Brodie from ' Fuller's Earth Rock, Gloucestershire.' The 



