Some new Upper Greensand Echinoderms. 1 7 



furnished with two rows of rather small tubercles, which are 

 placed close together and occupy the whole of the space be- 

 tween the pores. The poriferous zones are slightly sinuous, 

 wide, united above and below, and consist of nearly twenty 

 pairs of pores ; the pairs are wide apart and oblique. The 

 lower part of each plate is a little impressed, so that the upper 

 part projects below the pair of pores of the plate above. 

 Plates nearly quadrate. Interambulacral areas about three 

 times the width of the ambulacral, furnished with two rows 

 of large tubercles of three in a row, of which the top or middle 

 one is largest. The boss is greatly elevated, hemispherical, 

 and crenulated on the top. The areolse are suiTOunded, ex- 

 cept towards the poriferous zones on which they abut, by a 

 closely-placed row of secondary tubercles. The small inter- 

 spaces between the double zigzag rows which these form are 

 granulated. The mouth is very slightly pentagonal. The 

 apical disk appears to have been but slightly elevated ; its 

 marginal plates scarcely projected above those of the test. 

 The ocular plates have a rather deep spoon-shaped hollow on 

 each side of the ambulaci-al area. The other plates are not 

 suflficiently preserved for description, but appear to have been 

 ornamented. 

 Lat. ^ inch, alt. ^ inch ; oral opening nearly ^ inch ; apical 

 opening nearly ■^. 



This remarkable little Urchin is so distinct as not to admit of 

 comparison with any known form. 

 Rare. Coll. Univ. Mus. ; Ashwell. 



Hyposalenia may be regarded as a section of PeUastes, and 

 Peltastes and Goniophorus as subgenera of Salenia. 



Goniophorus lunatus, Ag., var. minutus. 



A minute inflated Urchin with an elevated disk. Base flat- 

 tened and slightly concave. Apical disk a regular pentagon, 

 broad; its margin considerably elevated: it is divided into 

 six pits, of which the central one is the anus ; it is square. 

 The pit immediately in front is also square ; all the rest are 

 pentagonal. Each of the five pits is margined by a strong 

 elevated ridge : the three anterior are transversely divided bv 

 a septum rather less elevated than the marginal cordon. The 

 genital openings are in the middle of the sides of the penta- 

 gon, at the point where the ridges meet. The madreporic 

 tubercle is visible, and occupies the right half of the right 

 anterior pentagon. The ambulacra are narrow and furnished 

 with two rows of tubercles, which occupy the whole space, 



Ann. ^- Mag, N. Hist. Ser. 3. Vol. viii. 2 



