136 



4. G. quaterfasciatus. Nearly globular or acutely co- 

 nical ; four small and four large areas divided by eight am- 

 bulacra; the mouth and vent quadrangular. Fossil 

 Siliceous. 



5. G. sexiesfasciatus. Subconical ; vertex obtuse ; six 

 large and six small areas, separated by twelve tuberculated 

 ambulacra ; vent round, and larger than the mouth. Fossil. 

 Siliceous. 



These two species of fossils are exceedingly rare. 

 The following species are also particularized by Lamarck : 



6. G. abbreviatus. Fossil, from France and Germany. 



7. G.fissuratus. Fossil, from the north of Germany. 



8. G. hemisphcericus. Fossil. 



It is doubted whether this may not be the same as Ech. 

 subuculus. of Leske ap. Klein, Tab. xiv. fig. L O. 



9. G. dupressus. Leske ap. Klein, Tab. xl. fig. 5, 6. 

 Fossil. 



10. G. rotularis. This is referred to Ech. subu,culus of 

 Gmelin and of Leske, Tab. xiv. but is supposed to be dis- 

 similar from G. hemisphcericus. Fossil. 



11. G. conoideus. Large; conoidal, nearly circular; the 

 mouth transverse, surrounded by a hollow. Fossil. Italy. 



12. G. scutiformis. Resembles that figured by Klein, 

 Tab. xlii. fig. 2, 3. Fossil. 



13. G. ovatus. Ovato-conoidal ; depressed at the sides. 

 Fossil. 



14. G. semi-globus. Orbicular and hemispherical; the 

 vertex excentrical, Leske ap. Klein, Tab. xlii. fig. 5. 

 Fossil. 



15. G. cylindricus. Cylindrical ; short ; the back rounded, 

 but nearly flat. Fossil. 



16. G. patella. Orbicular, depressed, and rather convex; 

 the ambulacral grooves elegantly striated ; one of the areas 

 excavated by a longitudinal groove. Encyclop. PI. cxliii. 

 fig. 1, 2. Fossil. 



