74 Dr. T. Wright on Fossil Echinoderms 



tubercle is prominent and central ; the granulations are almost 

 microscopic ; the base is flat ; the mouth is small and central, 

 and the anus marginal ; the ambulacral sulci are bifid ; the 

 margin of the test is thin, and the sinuosities well marked. Let 

 the student compare these characters with the detailed description 

 of S. subrotunda given in the preceding article. 



Locality and stratigraphical range. It was collected from bed 

 No. 4, the calcareous sandstone at Malta, where it is not common. 

 Our French specimen is from the middle tertiaries of Terre- 

 Negre. 



Genus ECHINOLAMPAS (Gray, 1835). 



Test of an elongated or subdiscoidal form ; petaloid portion 

 of the ambulacral areas large, generally elevated into convex 

 leaves, contracted towards the base, where they cease to rise 

 above the level of the test ; inferior surface concave towards the 

 mouth, which is median, symmetrical, pentagonal, and sur- 

 rounded by five lobes ; basal portions of the ambulacra with five 

 short poriferous zones around the mouth ; anus transversely 

 oblong and inframarginal ; apical disc small and excentral, five 

 genital and five ocular plates placed around the madreporiform 

 body ; tubercles small, uniform and numerous, sunk in the test, 

 and surrounded by ring-like areolas. Three species are living 

 in the seas of warm latitudes ; the others are fossil, mostly in 

 the tertiary rocks. A few are found in the upper stages of the 

 cretaceous series. 



Echinolampas Kleinii, Goldf. 



SYN. Clypeaster Kleinii, Goldfuss, Petrefact. Germanise, tab. 42. 



fig. 5. p. 133. 

 Echinolampas Kleinii, Desmoulins, Etudes des Echinides, p. 346. 



no. 14; Agassiz and Desor, Cat. raisonne, Ann. Sc. Nat. 



torn. vii. p. 166. 



Test ovato-orbicular in the outline, with the posterior border 

 slightly produced ; dorsal surface convex, posterior half more 

 elevated than the anterior; ambulacral areas unequal, usually 

 on a level with the general surface, but sometimes more 

 convex and prominent than the rest of the test ; apical disc 

 excentral and anterior ; base concave ; mouth excentral and 

 anterior; anus inframarginal; both mouth and anus trans- 

 versely oblong. 



Dimensions. Antero-posterior diameter 2^ inches, trans- 

 verse diameter 2|g inches, height l/^ inch. 



Description. This Urchin has been well figured by Goldfuss, 

 and is a very characteristic fossil of the Miocene tertiary beds 



