194 ; RALPH ‘TATE. 
of the upper surface. Ornament finely and closely scrobicular. 
Periproct at about one-half the distance from the peristome to the 
margin. Length 19, width 16-5, height 7. | 
Locality:—Hocene: River Murray Cliffs (several examples). 
This echinoid differs from 8. occitana, Defr., by its less tumid 
margin, more depressed shape, and raised (not sunken) apical disk. 
Genus Conoclypeus, Agassiz. 
The urchin which I refer to Conoclypeus has all the essential 
characters proper to the genus, viz., long open ambulacra, pores 
conjugate by grooves, central peristome with tumid bourrelets and 
without phyllodes, periproct marginal and transversely oval, 
ornamentation of small equal sunken scrobicules; but it differs in 
its depressed form and the flat apical disk (the unique specimen 
is, however, somewhat eroded in this part), and thus simulates 
Plesiolampus. 
The hard matrix filling the peristome of the single specimen does 
not permit me to ascertain whether a perignathic girdle is present 
or not ; but apart from this, the absence of phyllodes removes our 
fossil from the conoclypoid genus Phylloclypeus. On the other 
hand the imperforate and non-crenulate tubercles are not consonant 
with Conoclypeus, but rather with Plesiolampas; however I must 
not lay much stress here, because the somewhat defective condition 
of the surface makes it possible that I may be mistaken. 
The genus is most fully represented in the Eocene, but there 
are a few Cretaceous and Miocene species. 
CoNOCLYPEUS ROSTRATUS, spec. nov., Pl. xiii., fig. 1. 
Test moderately depressed, slightly longer than broad, broadly 
elliptical in marginal outline, broadest close behind the apical 
system ; posteriorly with a conspicuous though slight truncated 
projection margined on each side by a concave depression just 
posterior to the postero-lateral ambulacra. The highest point of 
the test is at the apical system, which is a little anterior to the 
geometric centre, the surface slopes thence to the slightly tumid 
margin which is less tumid at the ambulacra. Under surface ~ 
