\36 



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. 



3, 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. ahbreviatus. — Fossil, from France and Germany. 



7. G.Jissuratus. — Fossil, from the north of Germany. 



8. G. hemisphcBricus. — 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. subuculus of 

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

 similar from G. hemisphcericus. Fossil. 



IL 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.—Ovh'icxA^x 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. 



