~ 
246 ECHINODERMATA—ECHINOIDEA SUB-BRANCH III 
Faorina, Gray. Recent. Pericosmus, Ag. Cretaceous and Tertiary. 

Fic. 396. 
Hemiaster Orbignyanus, Desor. Upper Cretaceous; Martigues, Provence (after d’Orbigny). A-C, Ventral, 
dorsal and side views of test, 1/;. D, Pores of the odd Amb. E, Pores of the paired Amb, enlarged. 
Linthia, Merian (Desoria, Gray), (Fig. 397). Anterior dmb in a deep 

Fia. 397. 
Linthia Heberti, Cotteau. Eocene; Lonigo, near Vicenza. 3/4 natural size (after Dames). 
groove, the pores round and small, in pairs on either side. Antero-lateral 
Amb longer and more divergent than the others, with 
petals sunk in grooves. Pores conjugated. <A peripetalous 
and lateral fasciole present. Cretaceous to Recent. 
Schizaster, Ag. (Figs. 398, 399). Resembling Linthia, 
but the apical system posteriorly eccentric, and the 
Amb very diverse. Tertiary 
and Recent. 
Prenaster, Desor ; Orni- 
thaster, Coraster, Cottean. 
Eocene. 
Agassizia, Val.; Moira, 
A.Ag. Tertiary and Recent. 
Moiropsis, A. Ag. Recent. 


Fic. 398. Fic. 399. SECTION C. PRYMNODESMIA. 
Schizaster Archiaci, Cott. Schizaster fragilis, Ag. Apical  Subanal fasciole present. 
Eocene ; San Giovanni Dari- system, greatly enlarged (after 
one, near Vicenza. Lovén). 
Micraster, Ag. (Figs. 400,- 
401). Test cordiform, tumid, rather depressed. Anterior dm) apetaloid, in 
a shallow depression ; antero-lateral Amb sub-petaloid dorsally, diverging ; 
