124 



sides larger than the rest; four rows in the lesser. The 

 ambulacra narrow, with three double rows of pores ; the 

 spines acicular, and longitudinally striated. Recent and 

 fossil. Leske ap. Klein, Tab. xxxi. fig. A. D. 



3. E. angulosus. Rather depressed, and subangular ; 

 two rows of larger tubercles in both large and small areas, 

 surrounded with smaller. The ambulacra with three double 

 rows of pores, the outer ones in a straight, the inner ones 

 in zigzag lines. Recent and fossil. Leske ap. Klein, 

 Tab. ii. fig. 7. 



4. E. excavatus. Nearly hemispherical ; the areas with 

 two rows of miliary, surrounded by granular tubercles ; the 

 ambulacra depressed as if excavated, and having a double 

 row of alternating pores. Fossil. Leske ap. Klein, 

 Tab. xliv. fig. 3, 4. 



5. E. fenestratus. Roundish, the base smooth and 

 widely open ; the larger areas with six rows of tubercles, 

 the two intermediate rows largest ; the smaller areas with 

 two rows of larger tubercles; the surface of the areas granu- 

 lated with minute tubercles. The ambulacra granulated 

 and pierced with three pair of pores, transversely slanting ; 

 the spines-setose. Recent and fossil. Leske ap. Klein, 

 Tab. iv. fig. 3. 



It is doubtful if Ech. lucunter is not a variety of this 

 species. 



6. E. rupestris. Subelliptical ; areas with two rows of 

 larger tubercles, with smaller ones between in a serrated line ; 

 the ambulacra with the pores in curved lines; spines acicular. 

 Recent and fossil. Leske ap. Klein, Tab. v. fig. a. b. c. 



7. E. variegatus. Orbicular, rather depressed; larger 

 areas with tubercles of a medium size ; smaller ones a little 

 more raised, with three rows of smaller tubercles; am- 

 bulacra with three pairs of rows of pores; mouth nearly 

 round; slightly waved; vent round. Recent and rare. 

 Leske ap. Klein, Tab. x. fig. B. C. 



