418 
BULLETIN OF THE NATURAL HISTORY SOCIETY. 
Canadian beds. The development of one genus from another in the 
earliest larval stages is shown in the observations on the development 
of Anomocare stenotoides from an Olenus-like (Acantholenus) larva.* 
On the other hand, those studies show that Conophrys or rather 
IShumardia may be a valid genus, arrested in the phylum from which 
Asaphellus and Asaphus were elaborated ; if so, however, we should be 
able to find it in faunas from which these genera are absent. Never- 
theless it is quite possible that it might be absent from faunas which 
have the later Asaphi, if the Shumardia stage were passed over in the 
development of the later forms of this family. Such a case of arrested 
development, and fixation of larval as specific characters, seems to be 
presented to us in the species Bathynriscus pupa of the Mt. Stephen 
fauna,! as well as in Acantholenus spiniyer. 
That the form which we have described as an early moult of Asa- 
phellus Homfrayi is Asaphoid, though so far removed from the adult 
in form, I think is shown by its peculiar glabella, fading away at the 
front into the frontal area of the cheeks, so that the line of demark- 
ation between the two is not clearly traceable, a very common charac- 
ter in the Asaphoid trilobites. In this form it appears to the writer 
that the faint cresentic lobe in the front of the glabella is homologous 
with the front lobe of the glabella and the eyelobes collectively, and 
that the Haring anterior ends of the dorsal furrows represent the pos- 
terior half of the eyelobes. The obscurity of the occipital furrow is 
also an Asaphoid character. 
If Conophrys is a valid genus Mr. E. Billings’ genus Shumardia 
has precedence of it by five years. S. granulosa (Billings) of the 
Quebec group is evidently a diminutive trilobite of the same type and 
from near the same horizon..:; S. glacialis, of the same author, prob- 
ably belongs to another genus. t 
The late Dr. Henry Hicks, described from the Tremadoc group in 
South WaleS; two species of “Niobe,” which Prof. W. C. Broegger 
refers to Asaphellus^; one of these, N'. Menapiensis, is too large to 
compare with the Cape Breton species ; the other, N. .Solvensis, differs 
in the form of the movable cheek, and of the hypostome. 
* Bull. Nat. Hist. Soc. N B. St. John, 1898, No. xvi, p. 40. 
t Trans. Roy. Soc. Can. 2nd Ser., vol. v, sec. iv, p, 51, pi. ii, fig. 5. 
t Pala*ojcoic Roy. Soc. Can. 2nd Ser., vol, v., sec. iv, p 51, pi. ii, fig. 5. 
^ Euloma Niobe Fauna, Christiania, ’90, 47. p. 
