ORDER V EUECHINOIDEA—SPATANGOIDEA 245 
Amb petaloid dorsally, with elongate, unequal pores. dmb tumid dorsally. 
Peristome transverse, tumid in front, and usually with projecting labrum. 
Periproct longitudinal, supra- 
marginal. Cretaceous. 
Echinospatagus, Breyn. (Toz- 
aster, Ag. p.p.) Anterior Amb 
in a broad shallow groove, with 
unequal pairs of pores. Paired 
Amb sub-petaloid, flexuous, with 
unequal poriferous zones and un- 
equal pairs of pores. Peristome 
transverse, sub-circular, or penta- 
gonal. Tubercles small, per- 
forate, and crenulate. Abundant Fic, 394. 
in Lower and Middle Cretaceous. Echinospatagus (Toxaster) complanatus, Ag. Neocomian ; 
Auxerre, Yonne. 1/3. 
Ennalaster, @ Orb. (Heteraster, 
@Orb.) Petaloid parts of antero-lateral Amb divergent, flexuous, tending to 
close, and with very unequal poriferous zones, of which the posterior are the 
largest ; pairs of pores oblique. Postero-lateral dmb short, divergent. 
Peristome labiate, wide, arched in front. Periproct in posterior truncation. 
Cretaceous. 
Hemipatagus, Desor (Fig. 395). Test small, cordiform. Anterior Amb 
with small pores in a shallow furrow. Paired Amb long, petaloid, nearly 

A 



Hemipatagus Hofmanni, Goldf. Oligo- 
cene; Doberg, near Biinde. dA, Dorsal 
view. B, Profile. C, Ventral aspect, 1/, 
(after Goldfuss), 

flush. The lateral J4mb with a few large perforate and crenulate tubercles 
in deep scrobicules. Periproct supra-marginal. Tertiary. 
Platybrissus, Grube. Recent. Palaeopneustes, A. Ag. Recent, and perhaps 
Eocene. 
SecTION B. PRYMNADETES. Subanal fasciole absent, other fascioles present. 
Hemiaster, Desor (Fig. 396). Anterior Amb ina shallow groove, the 
pores oblique, and in pairs on either side. Antero-lateral Amb) petaloid 
dorsally, sunken, diverging, and much longer than the postero-lateral. Pores 
of the petaloid parts conjugated, the outer ones usually the largest. Peri- 
petalous fasciole present. 
Sub-genus Tripylus, Phill. (Abatus, Troschel). Recent. 
