518 s. GOix^: 



B. Papulœ uniformly distributed on the whole dorsal side 

 as far as close to the ventral edge, with very small 

 non-poriferous patches. Dorsal side uniformly covered 

 with very small, isolated tubercles (rarely spines). Ven- 

 tral side finely granulated all over and with pearl- 

 shaped coarser granules, wliich may be segregated into 

 groups corresponding to the ventral plates. Coarse 

 granules of the ventral side more or less larger than 

 those of the dorsal side. Inner adambulacral spines 

 mostly (at most 8) : 4. C. coriacea M.T. 



C. Papulne uniformly distributed on the whole dorsal side 

 as far as close to the ventral edge. All the granules 

 and spines of both the dorsal and ventral sides covered 

 over by continuations of the soft skin of the body. 

 Dorsal side with numerous sharp spines under the skin. 

 Inner adambulacral spines 2 (rarely 3): 



5. C. veneris E. Peke. 

 IL Body pentagonal or stellate -pentagonal. 



A. Body Stella to-pentagonal. Papulœ in patches on the dorsal 

 side, which is entirely destitute of tubercles. Inner 

 adambulacral spines 7 : C. C. niasse^isis Sluitek. 



B. Body pentagonal or slightly stellate. Papulre on the 

 dorsal side in eleven patches, one circumanal and two 

 triangular ones in each interradius ; or in five petaloid 

 radial patches, each patch being divided into two by a 

 naked radial line. Outer adambulacral spines in two 

 or three rows:'^ 7. C. horealis Siissbach & Breckner 



(North Atlantic). 



1) NeitluT SUssBAcH ami Beeckneb nor Fakean give the number of the inner adambiUacral 

 spines. 



