PLATE LXXVII. 



Fig. 1 a. EcHiNOCORYs vulgaris, Breynins. Posterior borrler, showing marginal vent. 



The type-form. My collection. (P. 



328). 

 \ h. — — — Under surface, showing mouth and vent. 



The type-form. 

 1 c. — — • — Lateral view, showing ambulacra and 



interambulacra with poriferous zones. 



The type-form. 

 \ d. — — — Apical disc, showing ovarial and ocnlar 



plates in situ. 

 1 e. — — — Peristome, showing ambulacra and large 



tubercles radiating therefrom. 

 1 /. — — — Ambulacral and interambulacral plates, 



near the summit (upper figure), and 



ambulacral and interambulacral plates, 



from the sides of test (under figure). 

 1 y. — — — Tubercles and granules of the upper 



surface. 

 1 /i. — — — Tubercles and granules from the lower 



surface. 



2. — PYRAMiDATUs, Portloclc. Tvpe-speciuien outline. School of 



Mines Museum. 



3. - — — — Un symmetrical form of this variety. 



4. — ovATDs, auctorum. Elongated and depressed form. My collec- 



tion. 



5. — GiBBUS, Agassiz. My collection. 



6. — PYRAMIDATUS. Tumid unsymmetrical variety. My collection. 



7. — STRiATUs, auctorum. A very elevated example. do. 



8. — PYRAMIDATUS. Tumid and unsymmetrical example, do. 



9. — OVATUS, Leske. French example, common. do. 



10. — VULGARIS. Flint mould, under surface, showing lines of 



poriferous zones. My collection. 



II- — — Flint mould, upper surface, showing impressions of 



the apical disc, the position of the ovarial and 

 ocnlar apertures, and furrow indicating the posi- 

 tion of the base of the sand canal. 



