16 SVEN LOVEN. ON A KECKNT FORM OF THE ECHINOCONID^. 



PLATE I. 

 Pygastrides relictus Lov. 



Fig. 1. Ventral aspect of the described specimen, a, magnified nearly 

 twelve times. 



The ambulacra are marked witb Romau mimerals, I — V, the 

 interradia witb the ligures 1 — 5. 

 The same, dorsal aspect. 



The same, side-vievv, presenting the ambulacrum IV and the in- 

 terradia 3 and 4. 



The peristomal region, seeu from witbout. 



The same from the interiör, comp. tig. 2. In the I a the mark 

 * denotes the auricle reraaining in its place, as also in 11 a, h, 

 III rt, b, IV h, V h, wbile ** indicates the base left by an aaricle 

 that bas fallen off, as also in IV a, V a. 



Fig. 6. The upper termination of tbe ambulacrum III. 



Fig. 7. Tbe peristomal part of an ambulacrum in a very oblique posi- 

 tion, sbowing the incisions of the lip, the hollow of tbe spherid, 

 and the epistromal protuberances producing the appearance of 

 another exteriör lip. 



Fig. 8. A tnbercle surrounded by epistromal globules, comp. fig. 4. 



Fig. '.). Protuberances of the epistrome. 



Fig. 10. A pore, comp. fig. 4, 7. 



