112 TRANSACTIONS OF THE [MaR. 17, 
SPONGIDA. 
The reference of a number of objects to this group has been 
made for the purpose of calling attention to remains which con- 
tain sponge spicules, but which are often in such imperfect 
preservation that they cannot satisfactorily be referred to known 
genera. Even Protospongia as defined by Salter is not of 
generic value; for Mr. C. D. Walcott studies on the Utica slate 
forms (first described at Cyathophycus), and Sir. Wm. Daw- 
son’s observations on the Ordovician sponges of Metis in the 
Province of Quebec have resulted in the establishment of sev- 
eral genera of which a number are contained in Salter’s Proto- 
spongia. 
Allied to Protospongia is Dichoplectella (Pl. I., figs. 4), an 
object found on glossy spots of the surfaces of shales, similar 
.to those which are marked with the cross-bars of Protospongia, 
and differing from it in that the spicules are seer, or appear to- 
fork. Cyathospongia sometimes presents a somewhat similar 
arrangement of spicules. 
Astrocladia is a modern genus to which were provisionally 
referred certain sponge-like forms containing monactinellid 
spicules, but which have not been studied in detail. 
The objects defined as Monadites are minute sack-like organ- 
isms, with or without a pedicle, found in connection with sponge 
remains, some of which are supposed to be sponge gemmules, 
but others may be simple organisms of low type, whose con- 
nection with sponges has been accidental. “These minute objects. 
have been found mostly in the Etcheminian series, underlying 
the St.John group. Forms similar to some of these have been 
found in the phosphate nodules of Band b. Division 1 of the St. 
John group, and have been brought to light in sectioning these: 
nodules. 
MOoNADITES. 
Trans. Roy. Soc. Can., vol. vii., sec. iv., p. 147, pl. vii., figs 1 
a-b, 2 a-b, and fig. 3. 
Size. The examples found in the phosphate nodules have a. 
diameter of } to + of a mm. 
Horizon and locality. Nodules of Assise 2, of Band b, con-- 
tained these remains. 
Prorosponaia, Salter. Pl. II., fig. 5. 
Trans. Roy. Soe. Can., vol. iii., sec. iv., p. 30, pl. v., figs 2 and 3. 
Spicules of the sponges of this type have been found at sey- 
