127 



18. E. variegatus. Hemispherically globose, variegated 

 with green and white ; the pores in two pairs of rows at the 

 sides of the areas ; the spines green. Recent. Lam. 



19. E. bigranularis. Hemispherical, rather depressed; 

 ambulacra rather bare ; the pores in four rows ; the areas 

 with large tubercles in double rows. Fossil. Lam. 



20. E. arenatus. Hemispherical ; ambulacra with pores 

 in four rows ; the tubercles of the largest areas but small, 

 the rest as if covered with sand. Fossil. Lam. 



21. E. sardicus. Orbicular, depressed; base nearly flat; 

 areas multifariously tuberculated ; the larger with eight or 

 twelve, the smaller with four or six rows. A suture passes 

 down the middle of the areas. Ambulacra sunken, with 

 five double rows of pores ; mouth small, with ten grooves. 

 Recent, large as a child's head. Tuscan and Adriatic Sea. 

 Leske ap. Klein, Tab. ix, fig. A. B. 



22. E.flammeus. Nearly hemispherical, depressed ; the 

 larger areas with twelve rows of tubercles at the broader 

 part ; the less, more raised, and with three rows in the 

 middle part ; ambulacra narrow ; mouth small. Recent. 

 Leske ap. Klein, Tab. x. fig. A. 



23. E. marnmillatus. Subelliptical, depressed; sixteen 

 or eighteen imperforate papillae in the larger areas, and 

 fourteen in the smaller, the largest being about the margin, 

 and followed by others of a middling size : all encircled by 

 others of a granular appearance ; the ambulacra rise broad 

 from the mouth with four or five pairs of pores, and ter- 

 minate in one sinuous pair ; the mouth large, and the vent 

 pentangular*. Recent and fossil. Leske ap. Klein, Tab. vi. 



* Spines are of the pallisadoe kind, sudes fortalitiorum, Klein ; 

 and are placed on the large mammillary tubercles ; small, spatulous 

 ones being attached to the smaller tubercles. Some of the fossil 

 specimens resembling this species deserve rather to be considered as 

 dictinct species, having very long cylindrical spines, denticulated in 

 longitudinal striae. Some in the writer's collection are more than 

 three inches in length. 



