ECHINOIDEA 271 



Primary spines not winged, cylindrical, tapering ; test not very 

 closely tuberculated. Large, globiferous pedicellari^ with a 

 small opening (Fig. 150, 3), stalk with a limb of freely pro- 

 jecting rods. Small globiferous pedicellariee with an end 

 tooth. (Cf. ''Ingolf' Ech., i. p. 35, PI. I. 1; PL VI. 9-10. 

 Koehler, Faune de France, p. 110) . . Stylocidaris Mrtsn. 



Fig. 150.— Large globiferous pedicellariae of Cidaris cidaris (1-2), Stulo. 

 J^auna , 2-4, after Th. Mortensen, " IngolJ'' Echinoidea, i.) 



1. Cidaris Leske.- 

 (Syn. Dorocidaris A. Agassiz.) 



Primary tubercles smooth, not crenulate ; ambulacra! pores 

 not conjugate. Primary spines with more or less thorny longi- 

 tudmal ridges, the surface between the ridges covered with fine 

 branchmg, anastomosing hairs. Collar short, only ca 1 mm' 

 long. Oral primaries not strongly serrate. All three kinds of 

 pedic^ellari^ present ; both large and small globiferous with a 

 well-developed end tooth (Fig. 150, 1-2) ; the stalk of the large 

 globiferous form very short, without a limb. 



Only one species known from the British seas (and the N E 

 Atlantic). ■ * 



