147 



7. A^. compressus. Small, ovate, as if compressed at the 

 sides, and not spotted ; the back carinated ; four impressed 

 ambulacra. Recent, from the Isle of France. 



8. S. crux andrecR. Ovate, depressed ; with four lance- 

 olate ambulacra, obliquely divaricating ; with ccellated in- 

 terstices. Recent. South Sea. 



9. S. sternalis. Ovate, assulated, spotted; with four 

 ambulacra ; with a carinated sternum on the lower surface. 

 Recent. South Sea. 



10. S. planulatus. Elliptical, depressed ; with four 

 narrow lanceolate ambulacra, obliquely divaricating ; inter- 

 stices subocellated. Recent. South Sea. 



* * With five ambulacra (spatangi.) 



11. S. canaliferus. Cordato-oblong, gibbous in the 

 hinder part ; with five open impressed ambulacra, the fore- 

 most the deepest, and channel-formed. 



Spatangus lacunosus. Leske ap. Klein, Tab. xxvii. 

 fig. A. Recent, in the South Sea. Fossil. 



12. S. atropos. 



An spatangus lacunosus ? Leske ap. Klein, Tab. x. fig. 

 A. B. Recent and fossil. 



13. S. arcuarius. Cordated, inflated, gibbous poste- 

 riorly ; with five ambulacra, the side ones resembling double 

 bows ; the mouth subcentral. 



Spatangus pucillus. Leske ap. Klein, Tab. xxiv. fig. 

 c. d. e. and Tab. xxxviii, fig. 5. 



14. S. punctatus. Cordated, convex ; the back carinated 

 posteriorly ; with small punctiform tubercles ; the ambulacra 

 crenulated. 



An spatangus cor anguinum? Leske ap. Klein, Tab. 

 xxiii.* fig. G. Fossil. 



* There exists a variety of this species, spat. cor. anguinum, 

 sulcis crispis, in which the ambulacra are slightly bent, and have 

 their transverse strise rather broader. 



