130 



7. C. calamaris. — Spheroidal, rather depressed; the 

 larger areas, with distant papillary tubercles, surrounded by 

 a granular surface ; two rows of tubercles in the smaller. 

 The ambulacra, with pores, in four divisions ; the spines 

 hollow, and possessing much of the structure of a quill. 

 Recent. — Leske ap. Klein, Tab. xlv. fig. 1-4. 



8. C. radiata. — Circular, depressed ; the vent surrounded 

 by plates forming a star of five angularly pointed rays, with 

 a foramen in the point of each ray. From each termination 

 of these rays proceed two other rays forming another star ; 

 these, being the ambulacra, are pierced with numerous 

 pores. The interstices, or areas, are filled with differently 

 sized tubercles. On the base is also a stelliform expansion, 

 in the middle of which are five semilunar openings. 



This is a large recent echinus ; Ecldnanthiis major, Seba. 

 — Kometgroote, Phelsum. — Leske ap. Klein, Tab. xliv. fig. I. 



The following fossils appear to belong to this genus, but 

 their specific characters are not so obvious : — 



9. Coronalis. — Nearly hemispherical ; the areas alter- 

 nately wide and narrow, with scattered papillae ; the am- 

 bulacra flat, uniting at the top, and forming a flat space 

 round the vent. Fossil. — Leske ap. Klein, Tab. viii. fig. A. B. 



10. Corollaris, — Various siliceous nuclei have been placed 

 under this head which have doubtlessly belonged to dif- 

 ferent species of cidarites. — 'Lesk^Q ap. Klein, Tab. viii. 

 fig. C. 



The fossil specimen, named cidaris asterizans, by Klein, 

 does not appear to deserve, as is justly observed by Leske, 

 to be considered of a different species, being a spathose 

 fossil of C. diadema, or of one of its varieties, the striae, in 

 the engraving, having been too much helped by the artist. — 

 Leske ap. Klein, Tab. xlvi. fig. 3. 



Genus III. Chjpeus. — Of a roundish subconical form ; 

 the base rather concave ; the mouth beneath, nearly central ; 

 the vent near the apex ; the ambulacra bowed, striated 



